How do radioactive isotopes differ from isotopes?

A) Radioactive isotopes have more neutrons than do isotopes.
B) Radioactive isotopes are stable; isotopes are unstable.
C) Radioactive isotopes have fewer neutrons than do isotopes.
D) Radioactive isotopes are unstable; isotopes are stable.


Answer: D) Radioactive isotopes are unstable; isotopes are stable.

Biology & Microbiology

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Fatty acid analysis

A. can be used to identify Gram-negative bacteria. B. can be used to identify Gram-positive bacteria. C. uses gas chromatography to analyze fatty acid methyl esters. D. requires that cells be grown under standardized conditions. E. All of these choices are correct.

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The extracellular matrix is composed mostly of

1.glycoproteins. 2.DNA. 3.RNA. 4.ribosomes. 5.lipids.

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What will be an ideal response?

Biology & Microbiology

Which classification level contains the greatest number of species?

a. class b. order c. family d. domain e. phylum

Biology & Microbiology