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Biology Module 1 Exam 2024/2025 Questions & 100% Correct Verified Answers Graded A, Exams of Biology

Biology Module 1 Exam 2024/2025 Questions & 100% Correct Verified Answers Graded ABiology Module 1 Exam 2024/2025 Questions & 100% Correct Verified Answers Graded ABiology Module 1 Exam 2024/2025 Questions & 100% Correct Verified Answers Graded ABiology Module 1 Exam 2024/2025 Questions & 100% Correct Verified Answers Graded ABiology Module 1 Exam 2024/2025 Questions & 100% Correct Verified Answers Graded ABiology Module 1 Exam 2024/2025 Questions & 100% Correct Verified Answers Graded ABiology Module 1 Exam 2024/2025 Questions & 100% Correct Verified Answers Graded A

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2024/2025

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Biology Module 1 Exam 2024/2025 Questions & 100%

Correct Verified Answers Graded A

Using the pH scale on the right, black coffee has approximately __________ H+ in solution than pure water. A. 1000x more B. 1000x less C. 100x more D. 100x less E. 20x less C. 100x more If a double-stranded DNA sample were composed of 15 percent cytosine, what would be the percentage of adenine? A. 15 B. 25 C. 35 D. 70 E. None of the above C. 35 You have a planar bilayer with equal amounts of saturated and unsaturated phospholipids. You record the degree of permeability of this membrane to glucose and find that there was some permeability. What would happen if you increased the proportion of saturated phospholipids in the bilayer? This bilayer _________. A. has changed, but glucose permeability has not B. is more permeable to glucose now C. is less permeable to glucose now

D. is less permeable to glucose but more permeable to CO2 now E. is more permeable to glucose but less permeable to CO2 now C. is less permeable to glucose now The chemical reaction illustrated in the accompanying figure _________. A. results in a beta-1,4-glycosidic bond B. is a hydrolysis reaction C. results in a peptide bond D. results in an alpha-1,4-glycosidic bond E. joins two nucleotides together D. results in an alpha-1,4-glycosidic bond If molecule X is C2H6, what does the above diagram indicate is happening? A. Simple diffusion out of the cell B. Facilitated diffusion out of the cell C. Active transport out of the cell D. Active transport into the cell E. Neither of the above, because molecule X cannot cross the membrane A. Simple diffusion out of the cell Both proteins and DNA can be (i) denatured and (ii) undergo hydrolysis. These processes involve disrupting specific interactions and breaking bonds, which can require enzymes. What would happen to DNA molecules treated with heat, a denaturant? A. The phosphodiester linkages of the sugar-phosphate backbone would be broken B. The two strands of the double helix would separate C. The purines would be separated from the deoxyribose sugars D. All bases would be separated from the deoxyribose sugars E. The phosphate groups would be separated from the sugars B. The two strands of the double helix would separate

In class we stated that chromosomes result from DNA being compacted into moveable structures for cell division. If you had to describe the tertiary structure of DNA, which of the following would you choose? A. A double-stranded helix B. A single nucleotide strand folded on itself in a "stem and loop" structure C. The sequence: 5' - ATTGCCCGTATGCGC - 3' D. A single nucleotide strand where multiple "stem and loop" structures begin to interact E. Double-stranded DNA helix wrapped around proteins called histones E. Double-stranded DNA helix wrapped around proteins called histones A student has drawn this model to study for her exam. Which statement is TRUE about her model? A. The shape with the dark area represents a barrier preventing substances from entering B. The phospholipids are drawn with their heads and tails in the wrong orientation in the bilayer. C. Only three different types of macromolecules are represented in this model. D. The smallest circles represent lipids used in cell signaling. E. All statements are true C. Only three different types of macromolecules are represented in this model The membrane protein labeled "A" in the image on the right is the GLUT-1. What might you expect about the movement of Na+ and/or glucose across the cell membrane? A. Both Na+ and glucose would likely move from the outside to the inside B. Both Na+ and glucose would likely move from the inside of the cell to the outside C. Na+ would likely move from the outside of the cell to the inside D. Glucose would likely move from the outside of the cell to the inside E. Neither solute would move because they cannot cross the cell membrane D. Glucose would likely move from the outside of the cell to the inside Which of the following is not dependent upon hydrogen bonding interactions? A. An alpha-helix and beta-pleated sheet

B. DNA secondary structure C. Cellulose D. Helical structure in starch E. Ice being less dense than liquid water D. Helical structure in starch The water molecule has many unique properties attributing to its importance in life. The partial negative charge at one end of a water molecule is attracted to the partial positive charge of another water molecule as indicated by #1 in the diagram below. What is this attraction called? A. A hydrogen bond B. A polar covalent bond C. An ionic bond D. A van der Waals interaction E. A hydrophobic interaction A. A hydrogen bond Read the following sentences, and then choose one option below. I. "We tested the hypothesis that the level of vitamin D in blood serum correlates to the expansion of endothelium-dependent blood vessels." II. We tested the hypothesis that mixing large numbers of different sequences of RNA molecules and allowing them to compete for replication over many cycles will produce specific sequences of RNA that act as enzymes. A. Both I and II are hypotheses B. I is a hypothesis, but II is a prediction C. I is a prediction, but II is a hypothesis D. Both I and II are predictions D. Both I and II are predictions The human stomach contains a natural, carbohydrate-based antibiotic that probably protects a large portion of the population from various diseases caused by the bacterium Helicobacter pylori. This bacterium has been linked to peptic ulcers, gastritis, and stomach cancer. This naturally occurring

antibiotic is described by researchers as having a terminal alpha-1,4-linked N-acetylglucosamine (NAG), and it acts by inhibiting a biosynthesis of a major component of the cell wall in H. pylori. Researchers created a glycoprotein with a terminal NAG (that is, a protein NAG attached to its end). Their hypothesis is that the terminal NAG, and not the protein component, is responsible for the damage to the cell wall in H. pylori. What would be the most appropriate control testing for this hypothesis> A. Grow H. pylori in a test tube (in vitro) with no glycoprotein B. Grow H. pylori in a test tube with a glycoprotein that B. Grow H. pylori in a test tube with a glycoprotein that has its terminal NAG removed According to the diagram to the right, _________ is experiencing passive transport and ___________ is experiencing secondary active transport? A. Molecule A; Na+ B. Na+; glucose C. Glucose; Na+ D. Molecule A; glucose E. None of the above B. Na+; glucose Normal hemoglobin is a tetramer, consisting of two molecules of beta-globin and two molecules of alpha-globing. In sickle-cell disease, as a result of a single amino acid change, the mutant hemoglobin tetramers associate with each other and assemble into large fibers. Based on this information alone, we can conclude that sickle-cell hemoglobin exhibits ___________. A. Only altered primary structure B. Only altered secondary structure C. Altered primary, secondary, and tertiary structure; the quaternary structure may or may not be altered D. Altered primary structure and altered quaternary structure; the secondary and tertiary structures may or may not be altered.

D. Altered primary structure and altered quaternary structure; the secondary and tertiary structure may or may not be altered A mutation occurs in this portion of a chromosome where cytosine replaces adenine. What impact do you think this will have on the DNA structure below? A. This will cause the phosphodiester bonds to break, and the DNA will hydrolyze B. This will cause the DNA secondary structure to denature or unzip C. This will cause a bulge in the DNA secondary structure D. This will cause a slight distortion in the DNA secondary structure E. Since cytosine is still a nitrogenous base, this mutation will have no impact on the DNA structure D. This will cause a slight distortion in the DNA secondary structure Proteins and nucleic acids have definite directionality. Stated another way, one end of the molecule is different from the other end. How are the ends of a nucleic acid described? A. One end has an unlinked 3' hydroxyl group; the other end has an unlinked 5' phosphate group B. One end has an unlinked carboxyl group; the other end has an unliked amino group C. One end has an unlinked amino group; the other end has an unliked hydroxyl group D. One end has an unlinked phosphate group; the other end has an unlinked carboxyl group E. One end has an unlinked 3' phosphate group; the other end has an unlinked 5' hydroxyl group A. One end has an unlinked 3' hydroxyl group; the other end has an unlinked 5' phosphate group The molecule below shows the stem-loop structure for an RNA molecule. Fill in the complementary bases to complete the stem. A. 3'-UGG-5' B. 5'-TGG-3' C. 5'-GGU-3' D. 5'-GGT-3' E. None of the above E. None of the above

What can you conclude about the denatures protein samples A and B? A. Protein sample A has polypeptides that are larger than protein sample B B. Protein sample B has polypeptides that are larger than protein sample A C. Protein sample A must have more hydrogen bonding than protein sample B D. Protein sample B must have more hydrogen bonding than protein sample A E. Protein sample A must have more alpha-helices and beta-pleated sheets than protein sample B A. Protein sample A has polypeptides that are larger than protein sample B What can you conclude about your favorite protein sample B from this result? A. Your favorite protein has only primary structure B. Your favorite protein has quaternary structure C. Your favorite protein is a homodimer D. Your favorite protein is a heterodimer E. Answer choices B and D B. Your favorite protein has quaternary structure