A defective protein can be produced by a cell when a mutation has which of the following effects?
A. Messenger RNA is prevented from being made.
B. It causes cells to divide in an uneven way.
C. An additional mRNA strand is caused to form.
D. The amino acid sequence coded by the gene is altered.
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Which of the following stages is the first step during the process of transcription?
A. A polypeptide strand is made.
B. Codons are read to produce an amino acid.
C. DNA is turned into an mRNA copy.
D. A section of DNA helix is unwound by an enzyme.
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