True/False
Indicate whether the sentence or statement is true or false.
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1. |
Despite years of research, the actual structure of the DNA molecule is still unknown.
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2. |
Franklin’s X-ray diffraction images suggested that the DNA molecule resembled a tightly coiled spring, a shape called a helix.
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3. |
In all living things, DNA replication must occur after cell division.
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4. |
Multiple DNA polymerases may become attached to more than one portion of a DNA molecule at once, speeding up the rate of replication.
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5. |
Before a DNA molecule can replicate itself, it must make itself more compact. This is accomplished by the double helix coiling up on itself.
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Completion
Complete each sentence or statement.
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6. |
A DNA subunit composed of a phosphate group, a five-carbon sugar, and a nitrogen-containing base is called a(n) ____________________.
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7. |
The name of the five-carbon sugar that makes up a part of the backbone of molecules of DNA is ____________________.
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8. |
Watson and Crick determined that DNA molecules have the shape of a(n) ____________________.
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9. |
Due to the strict pairing of nitrogen base pairs in DNA molecules, the two strands are said to be ____________________ to each other.
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10. |
According to base-pairing rules, adenine pairs with ____________________ and guanine pairs with ____________________.
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11. |
The enzyme that is responsible for replicating molecules of DNA by attaching complementary bases in the correct sequence is ____________________.
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12. |
Enzymes called ____________________ are responsible for unwinding the DNA double helix by breaking the hydrogen bonds that hold the complementary strands together.
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13. |
The process by which DNA copies itself is called ____________________.
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14. |
Molecules of ____________________ carry instructions for protein synthesis from the nucleus to the cytoplasm.
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15. |
The nitrogen-containing base that is found only in RNA is ____________________.
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16. |
The enzyme responsible for making RNA is called ____________________.
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17. |
The form of ribonucleic acid that carries genetic information from the DNA to the ribosomes is ____________________.
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