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NUTR 4320 Final Exam questions correctly answered, Exams of Advanced Education

Cheyney University of PennsylvaniaAdvanced Education

NUTR 4320 Final Exam questions correctly answered

Typology: Exams

2025/2026

Available from 07/02/2026

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NUTR 4320 FINAL EXAM QUESTIONS
CORRECTLY ANSWERED
1.
List some diseases associated with gut microbiota.: Metabolic syndrome,
cardiovascular
diseases,
rheumatoid
arthritis,
diabetes,
obesity,
NAFLD/NASH,
hypertension,
asthma,
colorectal
cancers,
IBD,
and
IBS.
2.
What are eukaryotic cells characterized by?: Eukaryotic cells have a nucleus,
mem-
brane-bound organelles, linear paired DNA, and 80S ribosomes.
3.
What
distinguishes
prokaryotic
cells
from
eukaryotic
cells?:
Prokaryotic cells
lack a
nucleus and membrane-bound organelles, have circular DNA, 70S ribosomes, and a cell
wall.
4.
What
is
peptidoglycan?:
Peptidoglycan is a polymer consisting of N-acetylglucosamine
(NAG) and
N-acetylmuramic acid (NAM) that forms the cell wall of bacteria.
5.
What makes up the glycan portion of the peptidoglycan structure?:
Alternating
NAM and NAG molecules that form a carbohydrate backbone
6.
What makes up the "peptido" portion of the peptidoglycan structure?:
polypep-
tides that link together the rows of NAG and NAM
7.
What part of the peptidoglycan structure is important for signalling in
the
host?:
The tetrapeptide side chain - consists of 4 amino acids attached to NAMs
8. What happens when penicillin binds to penicillin-binding proteins
(PBPs)?: -
The
binding
of
penicillin
to
PBPs
disrupts
peptidoglycan
cross-linking,
leading
to
irregularities
in
cell
wall
structure,
cell death, and bacterial lysis.
9.
What
is
the
function
of
teichoic
acids
in
Gram-positive
bacteria?:
Teichoic
acids
bind
and
regulate
the
movement
of
cations
and
prevent
extensive
cell
wall
breakdown
during
growth.
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16
pf17
pf18
pf19

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NUTR 4320 FINAL EXAM QUESTIONS

CORRECTLY ANSWERED

  1. List some diseases associated with gut microbiota.: Metabolic syndrome, cardiovascular diseases, rheumatoid arthritis, diabetes, obesity, NAFLD/NASH, hypertension, asthma, colorectal cancers, IBD, and IBS.
  2. What are eukaryotic cells characterized by?: Eukaryotic cells have a nucleus, mem- brane-bound organelles, linear paired DNA, and 80S ribosomes.
  3. What distinguishes prokaryotic cells from eukaryotic cells?: Prokaryotic cells lack a nucleus and membrane-bound organelles, have circular DNA, 70S ribosomes, and a cell wall.
  4. What is peptidoglycan?: Peptidoglycan is a polymer consisting of N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) that forms the cell wall of bacteria.
  5. What makes up the glycan portion of the peptidoglycan structure?: Alternating NAM and NAG molecules that form a carbohydrate backbone
  6. What makes up the "peptido" portion of the peptidoglycan structure?: polypep-tides that link together the rows of NAG and NAM
  7. What part of the peptidoglycan structure is important for signalling in the host?: The tetrapeptide side chain - consists of 4 amino acids attached to NAMs
  8. What happens when penicillin binds to penicillin-binding proteins (PBPs)?: - The binding of penicillin to PBPs disrupts peptidoglycan cross-linking, leading to irregularities in cell wall structure, cell death, and bacterial lysis.
  9. What is the function of teichoic acids in Gram-positive bacteria?: Teichoic acids bind and regulate the movement of cations and prevent extensive cell wall breakdown during growth.

2 / 25

  1. How do wall teichoic acid and lipoteichoic acid structures differ in terms of structurally supporting the cell wall?: Lipoteichoic acid anchors the cell wall to the plasma membrane, while teichoic acid helps to hold PGN layers together
  2. Describe the structure of the Gram-negative bacterial cell wall.: The Gram-neg-ative cell wall has a thin peptidoglycan layer surrounded by an outer membrane that contains lipopolysaccharides.
  3. What joins together the tetrapeptide side chains in Gram- positive bacte-ria?: lysine residues
  4. What joins together the tetrapeptide side chains in Gram- negative bacte-ria?: meso-DAP residues
  5. What are NOD receptors?: NOD receptors (Nucleotide Oligomerization Domain) are receptors that recognize peptidoglycan fragments and initiate immune responses.
  6. What fragments are biologically relevant PGN fragments?: M- Tetra-DAP M-Tri-DAP iE-DAP
  7. What are ligands for the NOD1 receptor?: ALL peptidoglycan fragments
  8. What is the ligand for the NOD2 receptor?: MDP fragment from the Gram- positive bacteria tetrapeptide side chain (NAM+Alanine+Glutamine)
  9. What is the significance of muramyl dipeptide (MDP)?: MDP is a ligand for the NOD2 receptor, playing a role in immune signaling and inflammatory responses.
  10. What does NOD1 signalling activate?: NFkB transcription factor - mRNA and protein expression of inflammatory mediators
  11. What does NOD2 signalling activate?: NFkB as well, but also transcription factor AP-1 (both promote chemokine and cytokine expression)
  12. How do Gram-positive and Gram-negative bacteria differ in their cell wall structure?: Gram-positive bacteria have a thick peptidoglycan layer and teichoic acids, while Gram-negative bacteria have a thin peptidoglycan layer and an outer membrane containing lipopolysaccharides.
  13. What is the function of the outer membrane in Gram-negative bacteria?: - protection from phagocytosis, penicillin, and lysozymes

4 / 25 does not cross plasma membrane) -> Mal/MyD88 -> IRAK -> TRAF-6 -> TAK-1 -> NFkB activation in nucleus

  1. What is the TLR-mediated signalling pathway for TLR-4?: has 2 options. 1) same as TLR-2 or 2) TRAM -> TRIF -> TRAF-6 -> RIP-1 -> NFkB activation in nucleus
  2. What is the microbiome?: The collection of all microbes that live in and on us
  3. What is microbiota?: A collection of all microorganisms living in a particular environment
  4. Each tissue specific microbiota will differ in the bacteria composition also called ?: Community structure
  5. Bacterial communities can differ in?: Abundance, diversity, and gene counts
  6. Fecal samples reflect what portion of the colon?: the distal colon
  7. We can classify bacteria based on taxonomy using what kind of technolo-gy?: 16S rRNA gene sequencing
  8. 16S is unique to bacteria. What is it for the host?: 18S
  9. What portion of the human microbiome makes up the phylogenetic core: - 1/
  10. What are the features of the phylogenetic core?: limited diversity, preserved, abundant, limited taxa
  11. What are the features of the unique individual microbiota?: high diversity, low abundance, many taxa
  12. Does microbial abundance and diversity increase or decrease in a diseased state?: Most commonly decreased, few diseases can increase it.
  13. What is the definition of dysbiosis?: out of balance - negative outcomes in the host
  14. What are the 2 most abundant phyla of microbiota in humans?: Firmicutes and Bacteroidetes
  15. What can cause the composition of microbiota to differ between babies?: - formula-fed vs. breast-fed
  16. What bacterial species are most abundant in breastfed babies vs formu-la-fed babies: Breastfed: Bifidobacterium

5 / 25 Formula-fed: Lactobacillus

  1. Before delivery, what factors contribute to the microbiome of a baby?: Pla-centa, umbilical cord/blood, amniotic fluid, meconium
  2. Does the mode of delivery affect the microbiota?: Yes, more diversity in vaginal delivery than in c-section delivery
  3. What are the 4 subsections of antimicrobials?: 1. Antibiotics
  4. Antivirals
  5. Antifungals
  6. Antiparasitics
  7. What is a prebiotic?: a non-digestible food ingredient that promotes the growth and activity of beneficial microorganisms in the intestines
  8. What is a probiotic?: Live microorganisms that, when administered in adequate amounts, confer a health benefit to the host
  9. What is a postbiotic?: metabolites produced by microbes in the gut that can cross the epithelial barrier
  10. Do probiotics colonize the gut?: NO
  11. How do you treat antibiotic-resistant C. difficile?: Fecal microbiota transplant
  12. What are 3 routes of administration for a fecal microbiota transplant?: 1. Enema
  13. NG tube through the nose into the stomach
  14. encapsulated into pills and taken orally
  15. What are 3 low-abundance bacterial phyla?: 1. Actinobacteria
  16. Proteobacteria
  17. Verrucomicrobia
  18. What are the 3 mechanisms of host antibacterial defense?: 1. Epithelial barrier
  19. Mucus barrier
  20. Antibacterial or Antimicrobial proteins secreted into the lumen

7 / 25

  1. What are N-linked glycans composed of?: Core proteins with oligosaccharides attached to the nitrogen atom in the amide group of the asparagine residues.
  2. What are the consequences of a pathogen getting through the mucous layer?: The pathogen comes into contact with the apical membrane of the epithelial cell and stimulates either i) apoptosis, or, ii) host secretion of inflammatory mediators that will break down tight junctions (TNFalpha)
  3. If a pathogen were to get through the mucous layer, what are the 3 barrier defense mechanisms?: 1. release of AMP
  4. shed extracellular domains of muc1/muc3 to coat the pathogen
  5. muc1/muc3 form a physical barrier that results in steric hindrance
  6. What are alpha-defensins?: An AMP against Gram-positive, Gram-negative bacteria, and fungi
  7. What are beta-defensins?: An AMP with 2 subcategories: -B1 against Gram-positive bacteria and fungi -BD2-6 against Gram-positive and negative as well as fungi
  8. What is the mode of action for a defensin?: Inactive prodefensins are secreted from granules into the lumen. To activate them, the host secretes proteolytic enzymes (trypsin and/or peptidases), which cleave the prodefensins to defensins.
  9. What are the 3 main types of REGs?: 1. REG3alpha: AMP against Gram- positive bacteria
  10. REG3beta: AMP against Gram-negative bacteria
  11. REG3gamma: AMP against Gram-positive bacteria
  12. What is cathelicidin? (LL37 in humans, CRAMP in mice): AMP against Gram-posi-tive/Gram-negative bacteria and fungi. -promotes wound healing, -attects both host and bacteria. -expression induced by calcitriol
  13. What is a lysozyme?: lyse open and kill bacteria; AMP against Gram-positive bacteria

8 / 25

  1. What is IgA?: anti-inflammatory released by B cells
  2. What are some examples of external factors that decrease AMP expres-sion?: High-fat diet Antibiotics Alcohol
  3. What are some examples of external factors that increase AMP expression?- : Bariatric surgery Bile acids Pancreatitis IBD
  4. What are 4 things that happen during adipose tissue remodelling?:
    1. Adipocyte hypertrophy
  5. Insuflcient angiogenesis (not enough oxygen)
  6. increased immune cells (macrophages and CD8+ T cells) decreased anti-inflammatory cells (Tregs)
  7. increased production of adipokines

10 / 25

  1. What is the role of M1 macrophages?: They are pro-inflammatory and promote insulin resistance.
  2. What inflammatory mediators are produced by M macrophages?: NFκB, TNFα, IL-6, MCP-1, and INOS/NO.
  3. What is the effect of saturated fatty acids on inflammatory mediator pro-duction?: They promote the production of inflammatory mediators.
  4. What transcription factors are activated by saturated fatty acids?: NFKB and JNK.
  5. What are the anti-inflammatory effects of n-3 PUFA mediated by?: PPARy-de-pendent and PPARy-independent mechanisms.
  6. What receptor do n-3 PUFA utilize for signaling?: GPR120.
  7. What is the effect of GPR120 activation on glucose uptake?: It stimulates GLUT expression and translocation to the plasma membrane.
  8. What is the role of GLP-1 in glucose homeostasis?: It regulates glucose levels, promotes beta cell growth, and reduces insulin resistance.
  9. What is the mechanism of action for GLP-1 receptor agonists like Semaglu-tide?: They improve beta cell function, augment insulin production, and inhibit glucagon release.
  10. What are the common side effects of injectable Semaglutide?: Pancreatitis, cholecystitis, dehydration, nausea, vomiting, diarrhea, abdominal pain.
  11. What dietary source is rich in resveratrol?: Red wine, grapes, grape juices, peanuts, and peanut butter.
  12. What effect does resveratrol have on high fat diet-induced body weight gain?: It limits body weight gain and decreases adipose tissue accumulation.
  13. How does resveratrol affect insulin secretion?: It stimulates pancreas secretion of insulin.
  14. What is the effect of resveratrol on adiponectin levels?: It increases adiponectin secretion and blood levels.

11 / 25

  1. What is the impact of resveratrol on liver lipid accumulation?: It decreases liver lipid accumulation, preventing fatty liver development.
  2. What happens to cardiometabolic markers after cessation of weight man-agement medication?: They return to baseline within 1.4 years.
  3. What is the structure of Semaglutide?: A GLP-1 analog with 31 amino acids, 94% homologous to human GLP-1.
  4. What modification protects Semaglutide from DPP-4 degradation?: The sub-stitution of alanine at the 8th position with Aib (2-aminoisobutyric acid).
  5. What is the role of SNAC in oral Semaglutide?: It acts as an absorption enhancer to improve bioavailability.
  6. How does oral Semaglutide's absorption change in patients taking proton pump inhibitors?: There is a slight increase in absorption due to higher stomach pH.
  7. What is the relationship between saturated fatty acids and insulin signal-ing?: They block IRS-1 phosphorylation, leading to insulin resistance.
  8. What is the effect of inflammatory mediators on insulin signaling?: They impair insulin receptor downstream signaling and glucose uptake.
  9. What is the significance of GLUT4 in insulin signaling?: GLUT translocation to the plasma membrane is essential for glucose uptake.
  10. What happens to glucose uptake when GLUT4 translocation is impaired?- : There is no glucose uptake, and the cell becomes insulin resistant.
  11. What is the role of TAB1 in inflammation signaling?: It suppresses TBK and TAK1, leading to inflammatory transcription factor activation.
  12. What is resveratrol and its primary source?: Resveratrol is a polyphenol found in red wine, known for its health benefits.
  13. What is the recommended dose of resveratrol in studies?: 200 mg/kg body weight (BW) in ZDF rats.
  14. How much red wine would a 70 kg person need to consume to match the resveratrol dose used in studies?: 1,167 liters of red wine daily at 12 mg/L.

13 / 25

  1. What is the role of glucagon-like peptide-2 (GLP-2)?: GLP-2 enhances epithelial barrier integrity.
  2. What is the relationship between obesity and adipokines?: Obesity increases the secretion of pro-inflammatory adipokines like IL-6 and TNF-α.
  3. What is the significance of dietary polyphenols in metabolic syndrome?: - They improve insulin sensitivity and reduce inflammation.
  4. What is the effect of cocoa on gut permeability?: Cocoa supplementation reduces gut permeability associated with obesity.
  5. What are the potential benefits of consuming whole dark chocolate?: It may reduce inflammatory biomarkers and improve insulin sensitivity.
  6. How do medicinal plants affect glucose transport?: They enhance glucose transport in muscle cells and inhibit intestinal glucose transport.
  7. What is the effect of high-fat diets on plasma lipids?: High-fat diets increase lipoge-nesis and plasma lipid levels.
  8. What is the role of antioxidants in managing obesity?: Antioxidants reduce oxidative stress and improve metabolic functions.
  9. What is the impact of dietary fiber from apples on gut microbiota?: Apple consumption alters gut microbiota composition positively.
  10. What role does the gut microbiota play in obesity?: The gut microbiota contributes to the development of obesity by influencing energy balance, metabolic function, and inflammation.
  11. What is dysbiosis?: Dysbiosis refers to a change in the composition and function of the microbiome, often linked to obesity and metabolic disorders.
  12. What is the effect of high-fat feeding on the microbiota?: High-fat feeding can lead to metabolic disorders like type 2 diabetes and increased endotoxemia.
  13. What is 'leaky gut'?: 'Leaky gut' refers to increased permeability of the intestinal barrier, allowing substances like LPS to cross into the bloodstream.
  14. How does the microbiota influence insulin sensitivity?: The gut microbiota plays a central role in controlling insulin sensitivity, with changes in microbiota composition attecting insulin response.
  15. What happens to germ-free mice when they receive microbiota from obese mice?: Germ-free mice adopt the obese phenotype when transplanted with microbiota from obese mice.
  16. What is the relationship between Akkermansia muciniphila and obesity?-

14 / 25 : Akkermansia muciniphila levels are negatively correlated with body weight; higher levels are found in non-obese individuals.

  1. What are some common changes in the composition of the obese mi-crobiota?: Increased abundance of Lactobacillus species and Fusobacterium species, and decreased levels of Bifidobacterium species.
  2. What is the significance of microbial gene counts in obesity?: Microbial gene counts indicate obesity severity; low gene counts are associated with less microbial diversity and activity.
  3. What distinguishes metabolically healthy obesity (MHO) from metaboli-cally unhealthy obesity (MUO)?: MHO individuals have greater cardiorespiratory fitness and insulin sensitivity, while MUO individuals exhibit systemic inflammation and metabolic dysfunction.
  4. What is the impact of fecal transplantation on insulin sensitivity in obese individuals?: Fecal transplantation from non-obese donors to obese recipients can restore insulin sensitivity.
  5. What is the effect of high circulating levels of LPS in obesity?: High circulating levels of LPS can stimulate adipose tissue inflammation and contribute to metabolic disorders.
  6. How does the microbiota composition differ between metabolically healthy and unhealthy obese individuals?: Metabolically healthy obese individuals have higher microbial diversity compared to those who are metabolically unhealthy.
  7. What are the consequences of low gene count (LGC) in microbiota?: Individuals with low gene count exhibit more adiposity, insulin resistance, and increased inflammatory mediator production.
  8. What are some examples of bacteria that decrease in abundance in the obese microbiome?: Akkermansia muciniphila, Bifidobacterium species, and Faecalibacterium prausnitzii.
  9. What is the relationship between body weight and the abundance of certain Lactobacillus species?: Some Lactobacillus species, like Lactobacillus paracasei, are negatively correlated with obesity.
  10. What is the effect of obesity on the diversity of gut microbiota?: Obesity is associated with decreased microbial diversity and altered microbiota functions.
  11. What is the role of endotoxemia in obesity?: Increased endotoxemia in obesity leads to systemic inflammation and contributes to metabolic disorders.
  12. How does the microbiota influence energy harvest?: The microbiota can enhance energy harvest from food, contributing to positive energy balance and obesity.

16 / 25

  1. How does CMC consumption affect fecal microbiota?: It induces strong alterations and decreases microbial diversity.
  2. What is the relationship between artificial sweeteners and glucose intoler-ance?: Artificial sweeteners can induce glucose intolerance by altering gut microbiota.
  3. Which artificial sweeteners have been studied for their effects on gut microbiota?: Aspartame, sucralose, and saccharin.
  4. What effect does sucralose have on bacterial diversity?: Sucralose decreases bac- terial diversity in the duodenum.
  5. What is a biofilm in the context of gut bacteria?: A cluster of bacteria encased in a self-produced matrix that aids in adhesion and infection persistence.
  6. How do artificial sweeteners affect the abundance of Akkermansia muciniphila?: Sucralose decreases the abundance of Akkermansia muciniphila.
  7. What is the impact of NNS on pathogenic bacteria?: NNS can increase the abundance of pathogenic bacteria and alter gut microbial metabolism.
  8. What are SCFAs and their role in gut health?: Short-chain fatty acids (SCFAs) have anti-inflammatory properties and are produced by beneficial gut bacteria.
  9. What is the significance of the invasion index in microbiota studies?: It measures the ability of bacteria to cross the epithelial barrier.
  10. What is the effect of CMC on the production of SCFAs?: CMC decreases microbial production of SCFAs and free amino acids.
  11. What is the role of dietary fiber in gut health?: Dietary fiber promotes the growth of beneficial gut bacteria and SCFA production.
  12. How do emulsifiers affect the mucus layer in the intestine?: Emulsifiers can disturb the mucus layer, leading to altered microbial balance.
  13. What effect do artificial sweeteners have on the composition of gut mi-crobes?: They can alter the composition and function of gut microbes, promoting metabolic disease.
  14. What is the relationship between high-fat and high-sugar diets and gut microbiota?: These diets promote dysbiosis and can lead to obesity and insulin resistance.
  15. What is the significance of the Shannon index in microbiota studies?: It measures microbial alpha-diversity, indicating the health of the gut microbiome.
  16. How do dietary components influence gut microbiota?: Dietary components can promote or inhibit the growth of specific bacteria, attecting overall gut health.

17 / 25

  1. What is the impact of emulsifiers on inflammatory mediators?: Emulsifiers can promote host epithelial cells to secrete inflammatory mediators.
  2. What is the recommended daily fiber intake for females?: 25 grams of fiber per day
  3. What is the recommended daily fiber intake for males?: 38 grams of fiber per day
  4. What percentage of the daily fiber requirement do most Canadians meet?- : About half of the requirement
  5. What is the caloric value of short chain fatty acids (SCFA)?: Estimated caloric value of 2 kcal/g
  6. What type of fiber is typically fermented to produce SCFA?: Soluble fiber sources
  7. What is the main difference in microbiota between North Americans and populations with high plant food consumption?: North Americans have low abundance of cellulolytic bacteria, while high plant consumers have high abundance.
  8. Name the three main types of SCFA produced from fermentation.: Acetate, Propionate, Butyrate
  9. What is the primary function of SCFA in the gut?: Improve/restore gut barrier function
  10. How does butyrate affect colonic pH?: It decreases colonic pH.
  11. What effect does butyrate have on pathogenic bacteria?: It inhibits NF- kB signaling, decreasing the growth of pathogenic bacteria.
  12. What are the effects of butyrate on intestinal epithelial cells?: It serves as an energy source and promotes epithelial cell proliferation.
  13. What does TFF3 promote in the gut?: It promotes integrity of mucus layers and epithelial barrier integrity.
  14. Which receptors do SCFA bind to in host tissues?: G-coupled protein receptors (GPRs) or free fatty acid receptors (FFAR).

19 / 25

  1. What is the impact of SCFA on Treg activation?: SCFA increase FOXP expression and Treg activation.
  2. What happens to gut barrier integrity with prebiotic fiber supplementation in obesity?: It improves gut barrier integrity and function.
  3. What is the role of L-cells in the gut?: They produce GLP-1, which is involved in gut barrier function and glucose homeostasis.
  4. What are the effects of resistant starches on SCFA production?: They promote sustained metabolite production over time.
  5. What can happen with the consumption of rapidly fermentable fibers?: They can produce higher amounts of SCFA and gases, potentially causing bloating.
  6. What is the significance of the pH gradient in the gut?: It aids in the absorption of SCFA and other metabolites.
  7. What is the effect of butyrate on epithelial barrier defense mechanisms?: It enhances defense mechanisms by stimulating production of protective substances.
  8. Name one major butyrate-producing bacteria.: Faecalibacterium prausnitzii
  9. What is the relationship between dietary fiber and SCFA production?: Dietary fiber is fermented by gut microbiota to produce SCFA.
  10. What are Fructooligosaccharides (FOS)?: Short-chain carbohydrates that can be naturally found or artificially synthesized, used as sweeteners.
  11. What are Galactooligosaccharides (GOS)?: Short-chain carbohydrates composed of galac-tose units, beneficial for gut health.
  12. What factors influence SCFA production?: The amount and type of fibers consumed and the microbiome composition.
  13. What is the role of SCFA transporters in the intestines?: They facilitate the absorption of SCFAs across the intestinal epithelial cells.
  14. What is cellulose?: An insoluble fiber made up of β-(1-4) linkages of glucose monomers.
  15. Which bacterial enzymes hydrolyze cellulose?: β-1,4-endoglucanase, β-1,4- exoglu-

20 / 25 canase, and β-glucosidase.

  1. Name some cellulose-fermenting bacteria.: Clostridium species, Bacteroides succino-genes, Ruminococcus species.
  2. What is resistant starch?: Starch that resists digestion in the small intestine and ferments in the colon.
  3. Which bacterial enzymes break down resistant starch?: Pullulanase type- 1, lyase, and α-glucosidase.
  4. What are the best sources of resistant starch?: Raw potato starch, green bananas, legumes, and yams.
  5. What is pectin?: A soluble fiber found in fruits, used to thicken jams and jellies.
  6. Which enzymes break down pectin?: Lyase, α-glucosidase, and polygalacturonase.
  7. What are some dietary sources of pectin?: Apples, berries, citrus fruits, legumes, and nuts.
  8. What is inulin?: A type of fructan that serves as a soluble fiber and prebiotic.
  9. Which bacteria ferment inulin?: Bifidobacterium species, Collinsella aerofaciens, and Eubacteri- um rectale.
  10. What is the structure of Fructooligosaccharides?: Composed of 1-kestose, nystose, and inulin linked by β-(2-1) glycosidic bonds.
  11. What are the effects of protein fermentation products?: They can negatively impact epithelial health or have beneficial ettects like reducing inflammation.
  12. What are SCFAs and their types?: Short-chain fatty acids, including acetate, propionate, and butyrate.
  13. What is the significance of butyrate?: It is a key SCFA that supports gut health and epithelial function.
  14. What is the role of ammonia in protein fermentation?: It can decrease butyrate transporter expression and disrupt epithelial barrier integrity.
  15. Which bacteria are known for fermenting arabinoxylans?: Prevotella species and Bifidobacterium species.
  16. What are β-glucans and their health benefits?: Polymers of glucose linked by β-(1-3) and β-(1-4) bonds, ettective in lowering LDL cholesterol.
  17. What is the impact of dietary fiber on gut microbiota?: Dietary fiber promotes the growth of beneficial gut bacteria and enhances SCFA production.