Download Review for Unit 7 Exam

Unit 7 Review
1 In DNA replication, a(n) ______ strand is used as a template for the assembly of a(n) ______ strand.
A leading ... lagging
B lagging ... leading
C old DNA ... new RNA
D old DNA ... new DNA
E old RNA ... new DNA
2 DNA polymerase can only move along the template DNA strand in the _____ direction.
A 1' to 5'
B 2' to 3'
C 3' to 5'
D 4' to 5'
E 5' to 1'
3 The letter "D" indicates a
A nucleotide.
B ribose sugar.
C phosphate group.
D nitrogenous base.
E deoxyribose sugar.
4 Which of these nitrogenous bases is found in DNA but not in RNA?
A uracil
B guanine
C adenine
D cytosine
E thymine
5 RNA nucleotides and DNA nucleotides differ in the
A location of their phosphate groups.
B nitrogen base that pairs with adenine.
C number of oxygen atoms in their sugars.
D B and C
E A, B, and C
6 The last step in the replication of DNA is catalyzed by
A
B
C
D
E
7 Which of the
A
B
C
D
E
ligase.
primase.
helicase.
DNA polymerase.
single-strand binding protein.
following statements about DNA replication is TRUE?
RNA primers are constructed by helicase.
Each new strand is assembled continuously.
Each replication bubble has one replication fork.
DNA polymerase can only assemble new DNA strands in the 5' to 3' direction.
Replication results in one molecule consisting of two old strands and one molecule consisting of two new
strands.
8 Which of these is a difference between a DNA and an RNA molecule?
A RNA contains uracil, whereas DNA contains thymine.
B RNA is double-stranded, whereas DNA is single-stranded.
C DNA contains nitrogenous bases, whereas RNA contains phosphate groups.
D DNA contains five-carbon sugars, whereas RNA contains six-carbon sugars.
E DNA is a polymer composed of nucleotides, whereas RNA is a polymer composed of nucleic acids.
9 In the accompanying image, the enzyme helicase is indicated by the letter _____.
A A
B B
C C
D D
E E
10 Who is responsible for producing the X-ray image that eventually led researchers to discover the double helix shape of
the DNA molecule?
A Franklin
B Watson and Crick
C Meselson and Stahl
D Hershey and Chase
E Darwin and Wallace
11 RNA processing removes ______ and splices together _______.
A introns ... exons
B uracil ... thymine
C polypeptides ... proteins
D RNA primers ... Okazaki fragments
E DNA nucleotides ... RNA nucleotides
12 When the ribosome reaches a stop codon, the releasing factor attaches at the ribosome's _____ site.
A A
B E
C P
D Q
E translocation
13 snRNPs and other proteins combine to make up the
A lysosome.
B ribosome.
C spliceosome.
D centrosome.
E none of the above
14 The single strand in the bottom half of this diagram of transcription represents
A DNA.
B RNA.
C the promoter.
D RNA polymerase.
E transcription factors.
15 An aminoacyl-tRNA synthetase attaches a(n) ______ to a(n) ______.
A thymine ... uracil
B adenine ... mRNA
C amino acid ... tRNA
D splicesosome ... snRNP
E nucleic acid ... ribosome
16 The tRNA anticodon, CUG, is complementary to the mRNA codon with the sequence
A GGC.
B CTG.
C GAC.
D GUC.
E GTC.
17 RNA processing is the process in which ______ is edited into mRNA.
A DNA
B tRNA
C rRNA
D pre-mRNA
E mitochondrial DNA
18 During RNA
A
B
C
D
E
processing, a(n) _____ is added to the 5' end of the RNA and a _____ is added to the 3' end.
modified guanine nucleotide ... poly-C tail
modified guanine nucleotide ... poly-A tail
modified thymine nucleotide ... poly-G tail
poly-A tail ... modified adenine nucleotide
poly-T tail ... modified thymine nucleotide
19 What name
A
B
C
D
E
is given to the process which involves the small subunit of the ribosome attaching to the mRNA?
elongation
RNA processing
initiation (of translation)
initiation (of transcription)
termination (of translation)
20 New DNA and RNA molecules can only be assembled in the _____ direction.
A 1' -> 5'
B 5' -> 3'
C 1' -> 3'
D 3' -> 5'
E 2' -> 4'
Question Answer Key
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Unit 7 Review
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