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

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

All of the following can lead to cancer except

a. mutagens. b. Bacteria. c. mutations. d. UV radiation. e. carcinogens.

Biology & Microbiology

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.

Biology & Microbiology