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Biology Study guide
Biology Study Guide Which one of the following statements is false? Selected Answer: a.
Factors that alter DNA and make cells cancerous are called carcinogens.

Which one of the following is false? Selected Answer: b. DNA packing tends to promote gene expression.

Silencers are sites in DNA that Selected Answer: c. bind repressor proteins to inhibit the start of transcription. Proteins that bind to DNA and turn on operons by making it easier for RNA polymerase to bind to a promoter are called Selected Answer: d. activators.

Which of the following best expresses the degree of success that has been attained in the cloning of humans? Selected Answer: d. A cloned human embryo developed to the blastocyst stage.

Which one of the following is false? Selected Answer: d. A mutation in a tumor-suppressor gene can stop cell division immediately.

Which of the following permits a single gene to code for more than one polypeptide? Selected Answer: b. alternative RNA splicing

Which of these mechanisms of controlling gene expression occurs outside of the nucleus? Selected Answer: e. translation

RNA splicing involves the Selected Answer: c. removal of introns from the molecule.

The expression of the tryptophan operon is controlled by Selected Answer: c. a repressor that is active when it binds to tryptophan.

Which one of the following statements is false? Selected Answer: a. Factors that alter DNA and make cells cancerous are called carcinogens.

Which one of the following is false? Selected Answer: b. DNA packing tends to promote gene expression. Silencers are sites in DNA that Selected Answer: c. bind repressor proteins to inhibit the start of transcription.

Proteins that bind to DNA and turn on operons by making it easier for RNA
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