BCHM 270 Test with Questions Solved 100% Correct |Verified Solutions
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Course
BCHM 270
Institution
BCHM 270
BCHM 270 Test with Questions Solved 100%
Correct |Verified Solutions
In many cells, the requirement of NADPH exceeds the requirement forribose 5-
phosphate. Under these conditions the pentose phosphate pathway results in the
production of:
a. Tricarboxylic acid (TCA) cycle intermediates.
b. G...
BCHM 270 Test with Questions Solved 100%
Correct |Verified Solutions
In many cells, the requirement of NADPH exceeds the requirement forribose 5-
phosphate. Under these conditions the pentose phosphate pathway results in the
production of:
a. Tricarboxylic acid (TCA) cycle intermediates.
b. Glucose to be stored as glycogen.
c. Amino acids for protein synthesis.
d. Glycolysis intermediates.
e. Pyruvate, COz and H20 - Answer
Glycogen synthesis is activated by:
a. Glucose 6-phosphate
b. ATP
c. NADH
d. All of the above.
e. None of the above. - Answer
HMG CoA reductase is an enzyme involved in:
1 Fatty acid synthesis.
2 Ketone
3 Fatty acid degradation
4 Cholesterol synthesis
a. only 4 is correct
b. 2 and 4 are correct
,c. all are correct
d. 1 and 3 are correct
e. 1, 2, and 3 are correct - Answer
Which of the following is not correct regarding Chylomicrons:
a. Contain Apo B-100
b. Transport lipids from the small intestine to peripheral tissues c. Are assembled in
intestinal mucosal cells
d. Contain fat-soluble vitamins
e. Are high in protein. - Answer
Which of the following is correct about collagen synthesis?
a. Disulfide bonds provide the cross-linking between mature collagen fibrils.
b. The helical structure is dependent on glutamine residues being in the centre of the
helix.
c. Collagen forms a quadruple helix with two alpha chains and two beta chains.
d. Hydroxylation of Proline and Lysine residues is necessary to provide structural
stability to the collagen by creating hydrogen bonds within the triplehelix.
e. Collagen has select hydroxyserine residues glycosylated with glucose and
galactose. - Answer
Which ofthe following is true about synthesis of the lagging strand of DNA in
replication?
a. Primase synthesizes short stretches of R N A primers
b. DNA polymerase IlI has proofreading abilities
c. DNA polymerase I removes RNA primer and replaces ti with DNA.
,d. A and B
e. All of the above - Answer
Eukaryotic DNA is packaged in the nucleus. Which is false about histones?
a. Histones have a high content of Leu and Asp residues to interact withDNA.
b. An octomer of H2A, H2B, H3, and H4 form the core of the nucleosome
c. DNA winds around nucleosomes twice as a negatively supercoiled helix
d. HI facilitates packaging of histones into nucleofilaments.
e. Histones are positively charged at physiologic pH. - Answer
Which of the following is correct:
a. Eastern blots probe for carbohydrates, southern blots probe for DNA, northern blots
probe for mRNA.
b. Western blots probe for proteins, southern blots probe for DNA, northern blots probe
for mRNA.
Western blots probe for carbohydrates, southern blots probe for DNA, northern blots
probe for mRNA.
d. Southern blots probe for protein, western blots probe for DNA, northern blots probe
for mRNA.
e. Western blots probe for proteins, southern blots probe for mRNA, northern blots
probe for DNA. - Answer
What does CRISPR stand for?
a. Cancer region interspaced short promoter repeats
b. Counter regulatory interspaced short palindromic repeats
c. Clustered regularly-interspaced short palindromic repeats
d. Clustered RNA-interference short promoter repeats
, e. Cas-9 regulatory insertion spacer promoter regions - Answer c
What is true about restriction endonucleases?
a. Recognize palindromes of 4-6 base pairs.
b. Cleavage can result in blunt ends that form hydrogen bonds.
c. DNA ligase can join restriction fragments with compatible sticky ends.
d. A and C.
e. All of the above. - Answer
What is correct about the classification of amino acids?
a. Tyr, Phe, Trp, and Ile are glucogenic and ketogenic. b. His, Met, Thr, and Val are
nonessential glucogenic.
c. Leu, Lys, Tyr, Pro, and Ser are nonessential glucogenic.
d. A and B are true.
e. A and C are true. - Answer
Which is true about PKU?
a. Pyridoxine (B6) responsive patients have a better clinical outcome.
b. The most common cause is a defect in cystationine B-synthase.
c. Tyrosine is not hydroxylated, so untreated patients have darker pigmentation.
d. Phenyllacetate and phenylacetate are elevated in the blood.
e. Mental retardation is caused by development of amyloid plaques. - Answer
Which of the following is NOT a pancreatic protease?
a. Carboxypeptidases A and B
b. Trypsin
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