Multiple Choice Quizzes - Life Sciences
danmelvanderson_i01c
w4.docxQuestion 1
DNA replication of a single DNA molecule is referred to as semiconservative because
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A. |
all the DNA strands in the two DNA molecules will have both parental and newly synthesized DNA. |
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B. |
of the two DNA molecules, one is made up totally of parental DNA, while the other is entirely newly synthesized DNA. |
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C. |
it results in two nonidentical DNA molecules. |
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D. |
each of the two DNA molecules will consist of one parental strand and one newly synthesized strand. |
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E. |
one DNA strand is replicated continuously, while the other must be replicated discontinuously. |
5 points
Question 2
In DNA, cytosine bonds to guanine. In RNA, cytosine bonds to
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A. |
adenine. |
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B. |
thymine. |
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C. |
cytosine. |
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D. |
uracil. |
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E. |
guanine. |
5 points
Question 3
The most important experimental results that suggested to Watson and Crick that DNA was in the form of a helix was
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A. |
the findings of Chargaff that DNA always had equal amounts of A and T and equal amounts of G and C. |
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B. |
the discovery that DNA is wound around histone proteins. |
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C. |
X-ray data from Rosalind Franklin. |
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D. |
understanding DNA replication. |
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E. |
Griffith’s results with transformation. |
5 points
Question 4
Normal human body cells contain how many chromosomes?
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A. |
23 |
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B. |
44 |
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C. |
42 |
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D. |
22 |
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E. |
46 |
5 points
Question 5
What step in DNA replication precedes the pairing of complementary bases?
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A. |
polymerization of DNA. |
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B. |
joining of the two strands. |
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C. |
formation of the histone core. |
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D. |
mitotic division. |
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E. |
separation of the two strands. |
5 points
Question 6
The two subunits of the ribosome join during
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A. |
termination of transcription. |
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B. |
initiation of translation. |
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C. |
elongation. |
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D. |
promotion of transcription. |
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E. |
termination of translation. |
5 points
Question 7
DNA replication
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A. |
is constantly happening in a cell. |
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B. |
occurs in the cytoplasm of the cell. |
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C. |
occurs in G1 of interphase. |
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D. |
takes place in the nucleus of the cell. |
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E. |
does not require proteins. |
5 points
Question 8
The bases are bonded to what part of the backbone of the DNA molecule?
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A. |
the 5’ carbon atom of the sugar molecule. |
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B. |
the 4’ carbon atom of the sugar molecule. |
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C. |
the 3’ carbon atom of the sugar molecule. |
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D. |
the 1’ carbon atom of the sugar molecule. |
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E. |
the 2’ carbon atom of the sugar molecule. |
5 points
Question 9
A component of bacteria that are often used in biotechnology are
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A. |
operons. |
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B. |
exons. |
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C. |
introns. |
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D. |
plasmids. |
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E. |
polypeptides. |
5 points
Question 10
In recombinant DNA technology, enzymes used to precisely cut DNA are called
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A. |
DNA polymerases. |
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B. |
RNA polymerases. |
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C. |
DNA ligases. |
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D. |
vectors. |
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E. |
restriction enzymes. |
5 points
Question 11
Hershey and Chase performed an experiment in which they used radioactive isotopes to phosphorus and sulfur to label different components of bacterial viruses. Their results clearly showed that
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A. |
protein was entering into the infected bacteria. |
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B. |
genetic material normally contains radioactive isotopes. |
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C. |
the viruses did not contain DNA. |
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D. |
DNA was entering into the infected bacteria. |
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E. |
the viruses did not contain protein. |
5 points
Question 12
In eukaryotes, transcription occurs in the
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A. |
mitochondria. |
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B. |
cytoplasm. |
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C. |
nucleus. |
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D. |
ribosome. |
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E. |
cell membrane. |
5 points
Question 13
We refer to the DNA code as being redundant or repetitive. This means that
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A. |
some codons code for the same amino acid. |
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B. |
a single triplet may code for more than one amino acid. |
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C. |
each triplet codes for one amino acid. |
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D. |
each triplet codes for a different amino acid. |
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E. |
one codon codes for one amino acid. |
5 points
Question 14
Base pairing
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A. |
takes place between sugars and phosphates on the two strands in a helix. |
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B. |
explains the X-ray results from Rosalind Franklin. |
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C. |
occurs between A and C. |
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D. |
occurs between identical bases. |
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E. |
requires hydrogen bonds. |
5 points
Question 15
The anticodon of the tRNA molecule base pairs with
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A. |
DNA. |
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B. |
rRNA. |
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C. |
amino acids. |
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D. |
mRNA. |
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E. |
polypeptides. |
5 points
Question 16
The fact that the two strands composing a DNA molecule are called antiparallel has to do with the orientation of the
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A. |
sugar molecules. |
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B. |
sulfide bonds. |
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C. |
phosphate molecules. |
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D. |
hydrogen bonds. |
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E. |
bases. |
5 points
Question 17
When looking at a table depicting the genetic code, the base sequences signify
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A. |
mRNA. |
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B. |
mtDNA. |
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C. |
rRNA. |
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D. |
DNA. |
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E. |
tRNA. |
5 points
Question 18
A package of histones with DNA wrapped around them forms spherical structures called
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A. |
chromatin. |
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B. |
ribosomes. |
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C. |
lysosomes. |
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D. |
nucleoli. |
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E. |
nucleosomes. |
5 points
Question 19
What enzyme is used to “glue” together the ends of cut pieces of DNA?
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A. |
DNA ligase |
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B. |
restriction enzymes |
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C. |
protease |
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D. |
RNA polymerase |
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E. |
DNA polymerase |
5 points
Question 20
What form of RNA carries instructions from the nucleus to the ribosome?
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A. |
bRNA |
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B. |
rRNA |
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C. |
sRNA |
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D. |
mRNA |
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E. |
tRNA |
