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Date:
BIO 260: BIOLOGY OF MICROORGANISMS
DNA STRUCTURE PRECONCEPTION TEST
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Short Answer: Please PRINT your answer to the following questions.
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1. The abbreviation, DNA stands for:
2. What is the basic unit of DNA?
3. What kind of chemical bond holds the basic unit(s) of DNA together? Is this a strong
or weak type of chemical bond?
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Multiple Choice: Circle the letter of the single answer that best answer the questions.
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4. The basic unit or monomer of DNA is composed of a(n):
A. Lipid, a molecule of nitrate and one of four amino acids
B. Lipid, a molecule of phosphate and one of four amino acids
C. Protein, a molecule of nitrate and one of four nitrogen containing bases
D. Sugar, a molecule of phosphate and one of four amino acids
E. Sugar, a molecule of phosphate and one of four nitrogen containing bases
5. Which one of the following substances is found in DNA but not in RNA?
A. Uracil
B. Thymine
C. Cytosine
D. Adenine
E. Guanine
6. What is the sequence of a strand of DNA complementary to the sequence listed below?
-T-G-G-C-A-A-C-T-A-G-C-C-T
A. T-G-G-C-A-A-C-T-A-G-C-C-T
B. U-G-G-C-A-A-C-U-A-G-C-C-U
C. A-C-C-G-T-T-G-A-T-C-G-G-A
D. A-C-C-G-U-U-G-A-U-C-G-G-A
E. T-C-C-G-A-T-C-A-A-C-G-G-T
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7. During DNA synthesis of double-stranded DNA:
A. Each original strand serves as a copy for the other strand.
B. Each original strand is synthesized at the same rate
C. Each original strand is synthesized in the same direction
D. Both original strands remain in the original cell
E. Each new strand is identical to each other
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TRUE/FALSE Circle the letter of one of the five choices that best describes your
response to the following statements. If you know why a statement is true or false please
explain in the box below the choices. If you don’t know why a statement is true or false,
then leave the box empty.
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8. DNA is considered an informational molecule.
A. I’m absolutely certain this is true
B. I’m pretty sure this is true
C. I have no idea whether this is true or false
D. I’m pretty sure it is false
E. I’m absolutely certain this is false
9. The genes in DNA contain the information for the production of cellular proteins.
A. I’m absolutely certain this is true
B. I’m pretty sure this is true
C. I have no idea whether this is true or false
D. I’m pretty sure it is false
E. I’m absolutely certain this is false
10. DNA found in the nucleus of cells is composed of two strands wrapped around each
other to form a double helix.
A. I’m absolutely certain this is true
B. I’m pretty sure this is true
C. I have no idea whether this is true or false
D. I’m pretty sure it is false
E. I’m absolutely certain this is false
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11. In order for two strands of DNA to stay together, the two strands must have the same
sequence of basic units.
A. I’m absolutely certain this is true
B. I’m pretty sure this is true
C. I have no idea whether this is true or false
D. I’m pretty sure it is false
E. I’m absolutely certain this is false
12. The chemical bonds that form between two strands of DNA are weak, hydrophobic
bonds that form spontaneously in water.
A. I’m absolutely certain this is true
B. I’m pretty sure this is true
C. I have no idea whether this is true or false
D. I’m pretty sure it is false
E. I’m absolutely certain this is false
13. Strands of DNA have direction.
A. I’m absolutely certain this is true
B. I’m pretty sure this is true
C. I have no idea whether this is true or false
D. I’m pretty sure it is false
E. I’m absolutely certain this is false
14. When two strands of DNA are antiparallel to each other, it means that one of the
strands is perpendicular to the other strand.
A. I’m absolutely certain this is true
B. I’m pretty sure this is true
C. I have no idea whether this is true or false
D. I’m pretty sure it is false
E. I’m absolutely certain this is false
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15. James Watson and Francis Crick were the first scientists to isolate DNA.
A. I’m absolutely certain this is true
B. I’m pretty sure this is true
C. I have no idea whether this is true or false
D. I’m pretty sure it is false
E. I’m absolutely certain this is false
16. The primary structure of DNA refers to the linear sequence of basic units in a strand
of DNA.
A. I’m absolutely certain this is true
B. I’m pretty sure this is true
C. I have no idea whether this is true or false
D. I’m pretty sure it is false
E. I’m absolutely certain this is false
17. A single change in the sequence of DNA is not classified as a mutation if it does not
alter the coding portion of a gene.
A. I’m absolutely certain this is true
B. I’m pretty sure this is true
C. I have no idea whether this is true or false
D. I’m pretty sure it is false
E. I’m absolutely certain this is false
18. When separating strands of DNA in the laboratory, DNA molecules with a higher
content of GC pairs are harder to separate.
A. I’m absolutely certain this is true
B. I’m pretty sure this is true
C. I have no idea whether this is true or false
D. I’m pretty sure it is false
E. I’m absolutely certain this is false
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19. Genes produced in a cell generate the phenotype or characteristics of a cell.
A. I’m absolutely certain this is true
B. I’m pretty sure this is true
C. I have no idea whether this is true or false
D. I’m pretty sure it is false
E. I’m absolutely certain this is false
20. The enzyme that synthesizes DNA is called DNA replicase.
A. I’m absolutely certain this is true
B. I’m pretty sure this is true
C. I have no idea whether this is true or false
D. I’m pretty sure it is false
E. I’m absolutely certain this is false
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