Biology Exam 3
Which of the following depicts the correct order of building blocks from less complex to most
complex in regards to the overall organization of DNA?
A. nucleotides, amino acids, genes, chromosomes, genome
B. nucleotides, amino acids, chromosome, genome, genes
C. genome, chromosomes, genes, amino acids, nucleotides
D. amino acids, nucleotides, chromosome, genes, genome
A. nucleotides, amino acids, genes, chromosomes, genome
You discover a new organism and analyze its DNA. If you find 17% of nucleotides are G, which
of the following is true:
33% are A
DNA isolated from blood found at a crime scene was amplified by PCR then separated by gel
electrophoresis. The same procedure was done with DNA isolated from several suspects.
Which of these suspects are most likely to be involved in the crime?
A. Professor Plum and Mrs. White
B. Miss Scarlett and Mrs. White
C. Mrs. Peacock and Mrs. White
D. Miss Scarlett and Mrs. Peacock
E. None of them seem likely.
B. Miss Scarlett and Mrs. White
Which of the following sequences is complementary to the DNA strand with sequence:
3' -TCCGAGCTA- 5'
(Hints: 1. Remember your 5' - 3' orientation rules. 2. More than one answer is possible.)
1. 5' -AGGCTCGAT- 3'
2. 3' -TAGCTCGGA- 5'
3. 3' -ATCGAGCCT- 5'
4. 5' -TAGCTCGGA- 3'
5. 3' -TCCGAGCTA- 5'
1 and 2
, Ultraviolet exposure can commonly result in which of the following forms of DNA damage?
Thymine dimer formation
What happens during the the three basic steps of conventional PCR?
DNA is broken up from double to single stranded or individual pieces, primers attach to each
DNA region of interest, extra nucleotides are added to each strand to synthesize a new
complementary strand until eventually two new identical pieces are made.
A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines. This DNA
molecule could be composed of which of the following:
A. 120 adenine and 120 cytosine molecules.
B. 120 thymine and 120 adenine molecules.
C. 120 adenine and 120 uracil molecules.
D. 120 cytosine and 120 thymine molecules.
E. 120 guanine and 120 thymine molecules.
B. 120 thymine and 120 adenine molecules
The Hershey-Chase experiment demonstrated that:
DNA was necessary for host cells to produce bacteriophages.
Which of the following is false about the process of DNA replication?
A. Both leading and lagging strands are elongated in 5’ to 3’ direction.
B. DNA ligase joins all the Okazaki fragments into a continuous DNA strand.
C. The lagging strand is synthesized as a series of segments called the Okazaki fragments.
D. DNA polymerase can only add nucleotides to the free 5’ end of a growing DNA strand or a
primer.
D. DNA polymerase can only add nucleotides to the free 5' end of a growing DNA strand or a
primer.
A biochemist isolates, purifies, and combines in a test tube a variety of molecules needed for
DNA replication. When she adds some DNA to the mixture, replication occurs, but each DNA
Which of the following depicts the correct order of building blocks from less complex to most
complex in regards to the overall organization of DNA?
A. nucleotides, amino acids, genes, chromosomes, genome
B. nucleotides, amino acids, chromosome, genome, genes
C. genome, chromosomes, genes, amino acids, nucleotides
D. amino acids, nucleotides, chromosome, genes, genome
A. nucleotides, amino acids, genes, chromosomes, genome
You discover a new organism and analyze its DNA. If you find 17% of nucleotides are G, which
of the following is true:
33% are A
DNA isolated from blood found at a crime scene was amplified by PCR then separated by gel
electrophoresis. The same procedure was done with DNA isolated from several suspects.
Which of these suspects are most likely to be involved in the crime?
A. Professor Plum and Mrs. White
B. Miss Scarlett and Mrs. White
C. Mrs. Peacock and Mrs. White
D. Miss Scarlett and Mrs. Peacock
E. None of them seem likely.
B. Miss Scarlett and Mrs. White
Which of the following sequences is complementary to the DNA strand with sequence:
3' -TCCGAGCTA- 5'
(Hints: 1. Remember your 5' - 3' orientation rules. 2. More than one answer is possible.)
1. 5' -AGGCTCGAT- 3'
2. 3' -TAGCTCGGA- 5'
3. 3' -ATCGAGCCT- 5'
4. 5' -TAGCTCGGA- 3'
5. 3' -TCCGAGCTA- 5'
1 and 2
, Ultraviolet exposure can commonly result in which of the following forms of DNA damage?
Thymine dimer formation
What happens during the the three basic steps of conventional PCR?
DNA is broken up from double to single stranded or individual pieces, primers attach to each
DNA region of interest, extra nucleotides are added to each strand to synthesize a new
complementary strand until eventually two new identical pieces are made.
A double-stranded DNA molecule contains a total of 120 purines and 120 pyrimidines. This DNA
molecule could be composed of which of the following:
A. 120 adenine and 120 cytosine molecules.
B. 120 thymine and 120 adenine molecules.
C. 120 adenine and 120 uracil molecules.
D. 120 cytosine and 120 thymine molecules.
E. 120 guanine and 120 thymine molecules.
B. 120 thymine and 120 adenine molecules
The Hershey-Chase experiment demonstrated that:
DNA was necessary for host cells to produce bacteriophages.
Which of the following is false about the process of DNA replication?
A. Both leading and lagging strands are elongated in 5’ to 3’ direction.
B. DNA ligase joins all the Okazaki fragments into a continuous DNA strand.
C. The lagging strand is synthesized as a series of segments called the Okazaki fragments.
D. DNA polymerase can only add nucleotides to the free 5’ end of a growing DNA strand or a
primer.
D. DNA polymerase can only add nucleotides to the free 5' end of a growing DNA strand or a
primer.
A biochemist isolates, purifies, and combines in a test tube a variety of molecules needed for
DNA replication. When she adds some DNA to the mixture, replication occurs, but each DNA
