1. Which of the following correctly describes the order in which cell components become involved in protein synthesis? a

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1. Which of the following correctly describes the order in which
cell components become involved in protein synthesis?
a RNA polymerase, mRNA, ribosome, tRNA
b mRNA, RNA polymerase, ribosome, tRNA
c RNA polymerase, mRNA, tRNA, ribosome
d DNA polymerase, mRNA, ribosome, tRNA
e DNA, rRNA, tRNA, mRNA
_____ 2. The process of _______________ cuts and joins exons from
the primary transcript of mRNA.
a) cleaving
b) translocation
c) elongation
d) splicing
e) termination
______ 3. Which one of the following is not directly associated
with the process of translation?
a) rRNA
b) mRNA
c) tRNA
d) DNA coding strand
e) codon
______ 4. RNA polymerase II binds to the ___________________ with
the help of _____________________
a) the promoter, transcription factors
b) TATA box, silencers
c) transcription factors, promoters
d) operator, TATA box
e) the enhancer, transcription factors
_______ 5. The repressor protein of the lac operon has two
different recognition and binding sites for other molecules. Which
of the
following pairs of molecules do you think is likely that these
sites would bind?
a a DNA sequence on the promoter and lactose
b RNA polymerase and the corepressor
c a DNA sequence on the operator and lactose
d RNA polymerase and lactose
e lactose and DNA polymerase
_____ 6. In the presence of high cellular concentrations of
tryptophan
a the repressor attaches to the DNA, but transcription
proceeds
b the repressor binds to tryptophan and then leaves the
operator
c tryptophan binds to the operator and prevents transcription
d tryptophan binds to the repressor, which than binds to the
operator
e tryptophan binds to the repressor, which binds to the promoter
and prevents transcription
_____ 7. The operator of the lac operon is 'upstream' of the genes,
which codes for enzymes. 'Upstream' means
a the operator is in the first part of the lacZ gene
b the operator is crossed by RNA polymerase before RNA polymerase
reaches the genes, which
code for enzymes
c the operator is crossed by RNA polymerase before RNA polymerase
crosses the promoter
d the operator is separated from the lacZ gene by thousands of
bases
e an intron separates the operator and the genes, which code for
enzymes
______ 8. One of the functions of the polyadenine tail that is
added to mRNA in eukaryotic cells is to
a prevent degradation of the mRNA
b initiate the binding of the mRNA to the ribosome
c help the mRNA to bind to a pore in the nuclear membrane
d add a specific amino acid sequence to the polypeptide
produced
e act as a signal for the termination of translation
______ 9. A certain protein needs to have a high energy phosphate
group added to it in the cytoplasm before it becomes active.
This offers the possibility of control at which of the following
levels?
a Transcriptional d translational
b Operational e posttranslational
c post-transcriptional
10. The 'one gene: one polypeptide' hypothesis had to be refined
because some genes
a. code for primary transcripts that are alternatively spliced
producing multiple polypeptides
b. code for many enzymes
c. code for primary transcripts that include multiple introns
d. code for primary transcripts that include multiple
promoters
1____11. Enzymes called amino acyl- tRNA synthetases:
a. Synthesize tRNA
b. Attaches amino acids to tRNA
c. Strips tRNA from its amino acid in the process of
translation
d. Destroys excess tRNA
e. Helps tRNA synthesize amino acids
____12. In the process of translation:
a. A strand of mRNA is fromed with the nucleotide sequences
complementary to those of DNA
b. Nucleotide sequences of tRNA are established
c. A polupeptide is formed in response to the rRNA nucleotide
sequence
d. rRNA is synthesized with seuqences ccomplementary to those of
tRNA
e. A polypeptide is formed as dictated by the nucleotide sequence
in mRNA
____13. As polypeptides are formed at the ribosome, elongation
continues until:
a. f-Met attaches to the start codon
b. A release factor attaches to the stop codon
c. A large ribosomal unit binds to the small ribosomal unit
d. tRNAs exit at the E site of the ribosome
e. A peptide bond is catalyzed by peptidyl transferase