Which of the following is not true about mutations? a. They can occur spontaneou

Question

Which of the following is not true about mutations? a. They can occur spontaneously because of exposure to a mutagen b. The likelihood of a mutation occurring is increased by the intensity and duration of exposure to a mutagen c. All mutations are harmful d. They can be passed to future generations Which of the following does not occur during DNA replication? Select one; a. One new strand is formed by continuous synthesis while the other new strand is formed in fragments. b. Cellular processes proofread new strands to check for errors. c. DNA strands unwind d. Two daughter strands are formed for each template strand Tumor-suppressor genes function by? Select one: a. preferentially absorbing carcinogens. Essentially sacrificing themselves in order to protect the other genes b. coding for proteins that act as antibodies for carcinogens. These proteins encapsulate and eliminate carcinogenic agents before they can affect the DNA c. coding for proteins that regulate cell growth. These proteins initiate cell self destruction if they detect improper replication d. preventing an DNA replication. If the DNA cannot replicate, the cells cannot divide, and the tumor cannot grow.

Explanation / Answer

1. (C) All mutations are not harmful. Their effects depend upon the environment.

2. (b) Proofreading is done by DNA polymerase.

3. (C) One of the way is by coupling cell cycle to DNA damage.

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