Vitamin C is Classified as a lactone - Biochemistry - Exam, Exams for Biochemistry. Biyani Girls College

Biochemistry

Description: Vitamin C is Classified as a Lactone, Avoid Saturated Fats, Molecule of ATP Contains Which Purine Base in Its Structure, Axis of a Dna Molecules, Melting Point of Oleic Acid, Vitamin C is Classified as a Lactone, Dna Sequence Analysis, Hyaluronate Or Amylose, Lipids Has the Amino Acid Serine in the Structure, Cell Membrane. Above points only tell you about this file. But if you are looking for some quizes and their solution of biochemistry, you are welcome to visit my directory.
Showing pages  1  -  2  of  3
The preview of this document ends here! Please or to read the full document or to download it.
Document information
Embed this document:

Each question has a maximum value of 3 points. The best answer is full value, the second best is one point

1. If your doctor told you to avoid saturated fats in your diet, you should especially avoid foods that contain:. a) oleic acid b) stearic acid c) triolein d) tristearin e) glucose, fructose or sucrose

2. A molecule of ATP contains which purine base in its structure: a) adenosine b) amylose c) alanine d) adenine e) adenylate

3. In DNA, cytosine will always be paired with: a) thymine b) uracil c) ribose d) phosphate e) guanine

4. One complete turn around the axis of a DNA molecules requires _____bases in one strand: a) 10.5 b) 3.4 c) 20 d) 12 e) 1.33

5. A trinucleotide contains this many phosphate molecules in phosphodiester linkage? a) 3 b) 4 c) 2 d) 1 e) none

6. To melt at a temperature lower than the melting point of oleic acid, a fatty acid must have at least: a) 3 double bonds c) 18 carbons e) 2 double bonds b) 1 double bond d) 16 carbons

7. A 5-deoxyketohexose was isolated from a primitive bacterium. Having never before seen this sugar, predict the number of possible straight-chain isomers of this sugar:

a) 5 or more b) 4 c) less than 4 d) 2 e) 1

8. In problem 7, how many straight chain D isomers are possible? a) 1 b) 2 c) 3 d) 4 e) none

9. Vitamin C is classified as a lactone. The definition denotes what specific group in the molecule? a) an internal ring-forming ester d) one ene-diol as opposed to one enol bond b) a double bond between two keto groups e) a tendency for the molecule to lactonize c) a phosphate attached to the anomeric carbon

10. In DNA sequence analysis (dideoxy reagent) the distance between successive peaks in the chromatogram is: a) one base b) 10 bases c) 100 bases d) 5 bases e) it varies from 1-10

11. As a biochemistry student you should know that the total number of optical isomers of an D-aldopentose as it would exist in solution is:

a) 2 b) 8 c) 4 d) 10 e) 16

12. An unknown disaccharide was derived either from hyaluronate or amylose. What is the best procedure that would allow you to determine the correct choice?

a. test for a glycosidic bond in the molecule d) test to see if there are 2, 6 carbon sugars b. titrate it with NaOH e) test for nitrogen or sulfur c. test to see if the disaccharide is reducing

13 Suppose you isolated a fat soluble carbohydrate from brain tissue. Because you took a biochemistry course, you should know that the compound you are studying is likely to be:

a) sphinogomyelin c) cholesterol bound to a carbohydrate e) DNA or RNA b) a cerebroside d) glycogen

BIOCHEMISTRY

Name _______________________

84 pts

Answer Questions 1-28 on Scantron

Docsity.com

14. How many sugars in the oligosaccharide of blood group O are NOT found in blood group A? a) none b) one c) two d) three e) all of them

15. How many OH groups in D-glucose (no ring) have a different right-left (steric) orientation from L-glucose a) none b) one c) two d) three e) all of them

16. Which of the following is an omega 3 fatty acid:

a) stearic acid c) cis 9,12, 15 linolenic acid e) none are

b) cis 6,9,12 linolenic acid d) cis 9 oleic acid

17. Which of the following has an 1-4, 1-6 bond in the molecule a) glycogen b) amylose c) sucrose d) cellulose e) none have

18. What class of lipids has the amino acid serine in the structure? a) sphingolipids b) acylglycerols c) sterols d) acylglycerol phosphates e) none

19. What class and molecules of carbohydrates have sulfur in the structure? a) heteropolysaccharides c) the chondroitins e) all of the above b) glycosaminoglycans d) heparin

20. Which molecule below would not be found in the cell membrane a) sphingomyelin c) ganglioside GM1 e) tripalmitin b) phosphatidylcholine d) phosphatidylinositol

21. 7-dehydrocholesterol is used in the synthesis of: a) Vitamin A c) estradiol e) either estrogen or testosterone b) Vitamin D3 d) testosterone

22. Carbohydrates are NOT attached to proteins via: a) O-glycosidic bonds to serine c) N-glycosylamine bonds to asparagine e) all of the above are used b) O-glycosidic bonds to threonine d) N-glycosylamine bonds to glutamine

23. An example of a hemiketal is:

a) D-fructose b) -D-fructose c) D-glucose d) -D-glucopyranose e) methyl -D-fructoside

24. Which molecule can NOT form micelles when placed in an aqueous solution? a) cholesterol ester c) oleic acid e) all would form micelles b) stearic acid d) arachidic acid

25. If hydrolysis of a fat gave glycerol, palmitic acid, oleic acid and phosphate as products, it is likely the fat was: a) a diacylglycerol c) lecithin e) a storage fat b) phosphatidic acid d) cholesterol ester

26. If you also found choline in the hydrolysate in problem 25, what would be fat: a) a diacylglycerol c) lecithin e) a storage fat b) phosphatidic acid d) cholesterol ester

27. In order for 2H+ ions to enter a cell, one Ca2+ must leave. This is an example of:

a) cation exchange b) symport c) antiport d) active diffusion e) uniport

28 The sodium/potassium ATPase in the cell membrane requires ATP to drive the removal of Na+ in exchange for a K+. According to your text book, this is an example of:

a) primary active transport c) secondary active transport e) selective diffusion b) competitive activation d) non-mediated transport

Docsity.com

SHORT ANSWERS

1. Calculate the maximum chemical potential difference attainable when cells equilibrated at 37oC against 0.1 M

sucrose are suddenly placed in a solution of 0.2 M sucrose at the same temperature. (SHOW ALL WORK)

2. DRAW and NAME the structure of EITHER your favorite UNSATURATED FATTY ACID or STEROID HORMONE. (Hint: Cholesterol is not a steroid hormone). (Hint: don’t draw both).

5 pts

Multiple Guess _____

Short Answer: _____

TOTAL

5 pts

9 pts

Your score is placed on the back page to preserve privacy. Check here if you would like

this exam handed back to you individually and not placed in a stack with the others

O

CH2OH

H

H H

H

OH

OH HO

O

CH2OH

H

H H

H

OH

OH

OH O

O

C

C

C

H H

H

H H

O C-CH2(CH2)nCH3

CH3(CH2)nC

O

P

O

O

O

O

O

OHO

CH2 O

O OH

O

O P

O

H

Name the bond and the orientation of the bond that is

holding the two sugars together

Name the bond that is holding the fatty acids to glycerol

moiety

Name the bond that is joining the two ribose units

together (be specific)

Check here if you would like your exam handed back

separately and not placed in a pile with the other exams

Docsity.com

Docsity is not optimized for the browser you're using. In order to have a better experience please switch to Google Chrome, Firefox, Internet Explorer 9+ or Safari! Download Google Chrome