10. A mutated form of a proto-oncogene is called: a) a tumor-inducing gene. b) a

Question

10. A mutated form of a proto-oncogene is called:

a) a tumor-inducing gene.

b) a tumor-suppressor gene.

c) an oncogene.

d) an apoptosis gene.

e) an accelerator gene.

7. True/false: A mutation in a single allele of a tumor-suppressor gene is sufficient for a cell to become cancerous. a) true b) false

8. Which of the following would most likely lead to nonhereditary cancer?

a) a single mutation in an egg cell

b) mitosis in a skin cell damaged by UV exposure

c) three mutations in an egg cell

d) apoptosis in a cell damaged by smoking

e) inheriting one mutation from each parent

. Two copies of a gene have identical regulatory sequences, but different coding sequences. These copies can be referred to as _____________.

a) alleles

b) highly similar

c) substitutes

d) low risk

e) high risk

Explanation / Answer

7. ANS: TRUE.

Explanation: only one of the two alleles is sufficient for induction of cancer.

8. ANS: b) mitosis in a skin cell damaged by UV exposure

Explanation: Hereditary definitio:A descriptive term for conditions capable of being transmitted from parent to offspring through the genes. The term hereditary is applied to diseases. So this condition (mitosis in a skin cell damaged by UV exposure) is not belongs to heridatry.

9. ANS: a. Alleles

Explanation: Each of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.

10. ANS: C. an oncogene.

Explanation: These genes code for proteins that help regulate cell growth. These important genes are called proto-oncogenes. A change in the DNA sequence of the proto-oncogene gives rise to an oncogene, which produces a different protein and interferes with normal cell regulation

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