Biochem exam 3
Study online at https://quizlet.com/_e8oy6f
1. which of the following describes the flow of genetic b
information as stated in the central dogma of molec-
ular biology
a) RNA --> Protein --> DNA
b) DNA--> RNA-->Protein
c)DNA--> Protein --> RNA
d)Protein-->RNA-->DNA
e)none
2. which of the following statements about insulin is/are e
true?
a)insulin is involved in regulating blood glucose lev-
els
b)insulin binds to receptor tyrosine kinases on the
outside of the cell membrane
c)diabetes can be caused by desensitization of cells
to insulin
d)insulin is a water-soluble peptide hormone pro-
duced by pancreatic beta cells
e)all of the above are correct
3. which of the following statements about hormones 1,2,4 are correct
are correct
1)hormones can be peptides, steroids, or amino acid
derivatives
2)hormones can stimulate the synthesis of target pro-
teins through the activation of specific genes
3)hormones can directly activate or inhibit enzymes
through the action of signal molecules.
4)hormones can increase cellular uptake of metabo-
lites
4. which of the following best describes the role of EF-Tu D
(elongation factor Tu) in elongation of protein synthe-
sis
a)it initiates termination of transription
b)it signals the end of the initiation process
c)it hydrolyzes GTP to GDP and allows the large ribo-
somal subunit to bind the small ribosomal subunit
1/9
, Biochem exam 3
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d)it is involved in the correct binding of aminoacyl
tRNA to the A site of the ribosome
e)it allows the peptidyl transferase activity to occur by
the hydrolysis of ATP
5. under which conditions are the lac structural genes D
expressed most effciently
a)high glucose, high lactose
b)no glucose, no lactose
c)high glucose,no lactose
d)no glucose, high lactose
e) all of the above
6. under which conditions are the lac structural genes no camp, no lac
expressed LEAST efficently
7. the DNA "backbone" is composed of b
a)an amide bond between deoxyribose and a nitroge-
nous base
b)a phosphodiester bond between 3' and 5' hydroxyl
groups of adjacent deoxyribose residues
c)a phosphodiester bond between 2' and 5' hydroxyl
groups of adjacent deoxyribose residues
d)a glycosidic bond between 2' and 5' hydroxyl groups
of adjacent deoxyribose residues
e) NONE
8. posttranslational modifications include all except c
a) disulfide bond formation
b) glycosylation
c) removal of introns
d) carboxylation
e) N-acylation
9. the process of translation is extremely accurate (1 D
mistake in 10,000). which of the following are related
to a proper amino acid incorporation?
a) wobble base pairing in position 3 of the codon/an-
ticodon interaction
b) codon/anticodon interactions
2/9
Study online at https://quizlet.com/_e8oy6f
1. which of the following describes the flow of genetic b
information as stated in the central dogma of molec-
ular biology
a) RNA --> Protein --> DNA
b) DNA--> RNA-->Protein
c)DNA--> Protein --> RNA
d)Protein-->RNA-->DNA
e)none
2. which of the following statements about insulin is/are e
true?
a)insulin is involved in regulating blood glucose lev-
els
b)insulin binds to receptor tyrosine kinases on the
outside of the cell membrane
c)diabetes can be caused by desensitization of cells
to insulin
d)insulin is a water-soluble peptide hormone pro-
duced by pancreatic beta cells
e)all of the above are correct
3. which of the following statements about hormones 1,2,4 are correct
are correct
1)hormones can be peptides, steroids, or amino acid
derivatives
2)hormones can stimulate the synthesis of target pro-
teins through the activation of specific genes
3)hormones can directly activate or inhibit enzymes
through the action of signal molecules.
4)hormones can increase cellular uptake of metabo-
lites
4. which of the following best describes the role of EF-Tu D
(elongation factor Tu) in elongation of protein synthe-
sis
a)it initiates termination of transription
b)it signals the end of the initiation process
c)it hydrolyzes GTP to GDP and allows the large ribo-
somal subunit to bind the small ribosomal subunit
1/9
, Biochem exam 3
Study online at https://quizlet.com/_e8oy6f
d)it is involved in the correct binding of aminoacyl
tRNA to the A site of the ribosome
e)it allows the peptidyl transferase activity to occur by
the hydrolysis of ATP
5. under which conditions are the lac structural genes D
expressed most effciently
a)high glucose, high lactose
b)no glucose, no lactose
c)high glucose,no lactose
d)no glucose, high lactose
e) all of the above
6. under which conditions are the lac structural genes no camp, no lac
expressed LEAST efficently
7. the DNA "backbone" is composed of b
a)an amide bond between deoxyribose and a nitroge-
nous base
b)a phosphodiester bond between 3' and 5' hydroxyl
groups of adjacent deoxyribose residues
c)a phosphodiester bond between 2' and 5' hydroxyl
groups of adjacent deoxyribose residues
d)a glycosidic bond between 2' and 5' hydroxyl groups
of adjacent deoxyribose residues
e) NONE
8. posttranslational modifications include all except c
a) disulfide bond formation
b) glycosylation
c) removal of introns
d) carboxylation
e) N-acylation
9. the process of translation is extremely accurate (1 D
mistake in 10,000). which of the following are related
to a proper amino acid incorporation?
a) wobble base pairing in position 3 of the codon/an-
ticodon interaction
b) codon/anticodon interactions
2/9
