BIOCHEMISTRY MCQs


21. PH+POH=14
a) 9+5=14
b) 8+6=14
c) 7+7=14✅
d) 10+4=14


22. Buffers
a) resist changes in pH from the addition of acid or base
b) resist changes in pH from the addition of acid or base
c) resist changes in pH from the addition of acid or base
d) all✅


23. components of buffer are
a) acid–base conjugate pairs
b) can be a weak acid and a salt of its conjugate base
c) can also be a weak base and a salt of its conjugate acid
d) all✅


24. Does each of the following combinations produce a buffer solution or not
a) . HCl and KCl
b) H2CO3 and NaHCO3✅
c) H3PO4 and NaCl
d) HC2H3O2 and KC2H3O2
Biochemistry


1. What are short polypeptides called?
A. Primary structures
B. Secondary structures
C. Polypeptides
D. Oligopeptides✅


2. What is comprised of alpha-helices or parallel or antiparallel beta-pleated sheets?
A. Primary structures
B. Secondary structures✅
C. Both A and B
D. None of the above


3. At what amino acids can beta-turns occur?
A. Glycine and alanine
B. Glycine and proline✅
C. Glutamate and proline
D. Glutamate and alanine

4. Where can disulfide covalent linkages occur between adjacent alpha-helices?
A. In keratin
B. In the major protein of hair
C. In nails
D. All of the above✅


5. Which of the following is a incomplete dietary protein found in connective tissues?
A. Collagen✅
B. Keratin
C. RNase A
D. All of the above


6. What is the cause of scurvy?
A. Not being exposed to enough sunlight
B. Misfolding protiens
C. Defective collagen✅ formation
D. All of the above


7. Fats and oils are also known as _______?
A. Polypeptides
B. Polymers
C. Tripeptides
D. Triglycerides✅
E. Trisaccharides


8. What is the relationship between glucose, mannose and galactose?
A. They are isomers
B. They are epimers✅
C. They are ketoses
D. No relationship exists


9. What is used to identify reducing sugars and in the past was used to test for diabetes mellitus?
A. Benedict’s test✅
B. N-glycosylation
C. O-glycosylation
D. None of the above


10. What best describes amylose?
A. Unbranched linear polymer with alpha 1-4 glycosidic linkages✅
B. Unbranched linear polymer with beta 1-4 glycosidic linkages
C. Highly branched, branched sites contain alpha 1-6 glycosidic linkages
D. Highly branched, branched sites contain beta 1-6 glycosidic linkages


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