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After mRNA processing,
remain
in the final product to be expressed during
translation.
a. introns
b. exons
c. transposons
d. hitones
e. plasmids
Answer: b
If cytosine makes up 22% of the
nucleotides in a sample of DNA from an
organism, then adenine would make up
what percent of the bases?
a. 22%
b. 44%
c. 28%
d. 56%
e. It cannot be determined from information
given.
Answer: c
What kind of chemical bonds are found
between paired bases of the DNA double
helix?
a. hydrogen
b. ionic
c. covalent
d. sulhydryl
e. phosphate
Answer: a
Which enzyme catalyzes the elongation
of a DNA strand in the 5’---3’ direction?
a. primase
b. DNA ligase
c. DNA polymerase
d. topoisomerase
e. helicase
Answer: c
Prokaryotic genetic material does not
include
a. DNA
b. mRNA
c. tRNA
d. rRNA
e. histones
Answer: e
Meselson and Stahl grew bacteria in a medium
containing N15 and then transferred them to a
medium containing N14. Which of the results
would be expected after two DNA replications?
a. One band of N15 DNA
b. One band of N14 DNA and one band of N15 DNA
c. One band of N14 DNA
d. One band of hybrid N14-N15 DNA
e. One band of N14 DNA and one band of hybrid
N14-N15 DNA
Answer: e
The previous experiment proved DNA is
a. conservative.
b. semiconservative.
c. dispersive.
d. radical.
e. degenerative
Answer: b
The movement of a piece of one
chromosome to another chromosome
causing Cri-du-Chat syndrome is
a. translocation.
b. transduction.
c. transformation.
d. transplantation.
e. trangenesis.
Answer: a
a. Transcription
b. Translation
c. Transformation
d. Replication
Answer: c
11. what Griffith showed
12. happens in the cytoplasm Answer: b
13. makes mRNA
Answer: a
A particular eukaryotic protein is 300
amino acids long. Which of the following
could be the number of nucleotides in the
DNA that codes for this protein?
a. 3
b. 100
c. 300
d. 900
e. 1800
Answer: e
All of the following are directly involved
with translation except
a. mRNA
b. tRNA
c. rRNA
d. ribosomes
e. DNA
Answer: e
As a ribosome translocates along a mRNA
Molecule by one codon, which of the
Following occurs?
a. The tRNA that was in the A site moves to the
P site.
b. The tRNA that was in the P site moves to the
A site.
c. The tRNA that was in the P site departs from
the ribosome in the E site.
d. The tRNA that was in the A site departs from
the ribosome.
e. Both a and c are correct. Answer: e
All of the following are transcribed from
DNA except
a. exons.
b. protein.
c. rRNA.
d. tRNA.
e. miRNA.
Answer: b
A possible sequence of nucleotides in
DNA that would code for the polypeptide
sequence phe-leu-ile-val would be
a. 5’-TTG-CTA-CAG-TAG-3’
b. 3’-AAC-GAC-GUC-AUA-5’
c. 5’-AUG-CTG-CAG-TAT-3’
d. 3’-AAA-AAT-ATA-ACA-5’
e. 3’-AAA-GAA-TAA-CAA-5’
Answer: e
What amino acid sequence will be
generated based on the following mRNA
codon sequence?
5’-AUG-UGG-CAU-UCG-UGU-3’
a. met-trp-gln-ser-cys
b. met-trp-his-cys-cys
c. met-cys-his-ser-cys
d. met-trp-his-ser-cys
e. met-trp-his-cys-ser
Answer: d
A frameshift mutation could result from
a. a base deletion only.
b. a base insertion only.
c. a base substitution only.
d. deletion of three consecutive bases.
e. either an insertion or a deletion of a
base.
Answer: e
DNA replication can best be
described as
a.
b.
c.
d.
e.
semiconservative.
conservative.
degenerative.
dispersive.
radical.
Answer: a
In DNA replication, DNA polymerase
catalyzes the reaction in which
a. the double helix unwinds.
b. the sugar-phosphate bonds of each strand are
broken.
c. a phosphate group is added to the 3’-carbon or 5’carbon of ribose.
d. a nucleotide with a base complementary to the base
on the template strand is added to the new DNA
strand.
e. the two nucleotide strands come together and
intertwine to form a double helix.
Answer: d
In order for a bacterium to produce a
eukaryotic protein, which of the following
must first be isolated from a eukaryotic cell
prior to cloning?
a. The protein’s primary RNA transcript from the
nucleus
b. The protein’s mRNA from the cytoplasm.
c. The protein from the rough endoplasmic reticulum
d. The introns from the segment of DNA that codes for
the protein
e. The segments of DNA that control transcription for
this protein
Answer: b
A. Crossing over
B. Inversion
C. Translocation
D. Nondisjunction
E. Deletion
1. Part of a chromosome breaks away and then
reattaches to the same chromosome in reverse
Answer: B
orientation.
2. Part of a chromosome breaks away and attaches to a
non-homologus chromosome. Answer: C Answer: E
3. Part of a chromosome lacking a centromere breaks
away and does not reattach to another chromosome.
4. Tetrads fail to separate correctly during anaphase in
this process. Answer: D
Cells that contain only circular
chromosomes are most probably which of
the following?
a.
b.
c.
d.
e.
protist cells
fungal cells
bacterial cells
plant cells
animal cells
Answer: c