The length of a DNA sequence is _____ than the mature mRNA transcribed from it, because
shorter; it does not contain exons.
equal; it was transcribed from the DNA sequence.
longer; it does not contain introns.
shorter; each codon of three bases encodes only one amino acid.
longer; each codon of one amino acid encodes three bases.
longer; it does not contain introns
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A point mutation that causes no change in the amino acid sequence of a protein is called a _____
A. synonymous (silent) mutation B. nonsynonymous (missense) mutation C. nonsense mutation D. stop mutation E. transition mutation
The importance of crustose calcareous algae on a coral reef is that they:
a. provide food for corals. b. prevent settlement of larvae. c. cement bits of rubble in the process of reef formation. d. are a major source of food for reef dwellers. e. create habitat for juvenile fish.
All of the following can lead to cancer except
a. mutagens. b. Bacteria. c. mutations. d. UV radiation. e. carcinogens.
Infection occurs when
A. a person swallows microbes in/on food. B. pathogens enter and multiply in body tissues. C. a person inhales microbes in the air. D. contaminants are present on the skin. E. All of these choices are correct.