BCHM 307 QUIZ 3 EXAM QUESTIONS WITH REVISED ANSWERS ALL UPDATED
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Course
BCHM 307
Institution
BCHM 307
BCHM 307 QUIZ 3 EXAM QUESTIONS WITH REVISED ANSWERS ALL UPDATED
Glucose and galactose are _____ of each other. - Answer-epimers
The transformation of a monosaccharide into its _____ occurs easily and does not require the assistance of a catalyst. - Answer-anomer
What is the only monosacchar...
BCHM 307 QUIZ 3 EXAM QUESTIONS
WITH REVISED ANSWERS ALL
UPDATED
Glucose and galactose are _____ of each other. - Answer-epimers
The transformation of a monosaccharide into its _____ occurs easily and does not
require the assistance of a catalyst. - Answer-anomer
What is the only monosaccharide that is achiral? - Answer-dihydroxyacetone
Which of the following are characteristic of cellulose? - Answer--unbranched polymer
-highly extended fibers
-beta(1→4) glycosidic bonds
-extensive hydrogen bonding between individual molecules
The three-carbon monosaccharide _____ is a(n) _____. - Answer-glyceraldehyde;
aldose
At equilibrium in solution, D-glucose consists of a mixture of its anomers. Which
statement most accurately describes the solution? - Answer-the β-anomer
predominates over the α-anomer by a ratio of approximately 2:1
Amylopectin contains primarily _____ glycosidic bonds with _____ glycosidic bonds as
branch points. - Answer-α(1→4); α(1→6)
Which of the following disaccharides has both anomeric carbons involved in the
glycosidic bond? - Answer-sucrose
Which of the following is the major difference between glycogen and amylopectin? -
Answer-glycogen contains about twice the number of branch points as amylopectin
The enzyme _____ from _____ allows animals such as cows to derive energy from
cellulose. - Answer-cellulase; microorganisms
Any sugar that has a free aldehyde group is called a(n) _____. - Answer-a reducing
sugar
The reaction between an alcohol and an anomeric carbon of a carbohydrate forms a
_____ bond. - Answer-glycosidic
, In the nucleus, DNA is wrapped around ________ to form _______. - Answer-histones;
nucleosomes
Besides the obvious role of keeping DNA in a single stranded state, what do single-
strand binding proteins do? - Answer-protect single strand DNA from nucleases
Which strand of DNA is replicated exclusively in a discontinuous fashion? - Answer-
lagging strand
Which of the following best describes a new strand of DNA relative to the template
strand used to synthesize it? - Answer-a negative copy of the template
Synthesis of telomeres requires the enzyme ___________, which is a type of
_________. - Answer-telomerase; reverse transcriptase
An E. coli has ___ replication fork(s) on its single chromosome; humans have ______
replication fork(s) on each chromosome. - Answer-2; many
What does a reverse transcriptase do? - Answer-converts an RNA genome into a DNA
genome
Histone proteins that bind to areas of DNA that are highly transcribed are often
__________ on _________ residues. - Answer-acetylated; lysine
If the smallest human chromosome is 4.6 x 10^7 base pairs in length, which of the
following is the best estimate of the number of Okazaki fragments resulting from its
replication? - Answer-300,000
Which of the following is found in high concentrations in telomeres? - Answer-G
Which tumor suppressor gene is found to mutated in at least half of all human tumors? -
Answer-p53
In most organisms, replication proceeds in a ________ manner from the _________. -
Answer-bidirectional; replication origin
What effect does a topoisomerase have on DNA? - Answer-changes the supercoiling of
DNA
Without telomeres, what would happen to the ends of eukaryotic chromosomes during
replication? - Answer-they would be shortened
An antibiotic that interferes with bacterial topoisomerase activity is _________, which
specifically inhibits __________. - Answer-ciprofloxacin; DNA gyrase
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