Which of the following was probably the first information storage molecule?

a. DNA
b. RNA
c. protein
d. carbohydrates
e. lipids


B

Biology & Microbiology

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The gradual change in specific human mitochondrial DNA sequences along a river illustrates

A) a founder effect. B) a population bottleneck. C) a cline. D) spontaneous mutation.

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The two major hormones that directly function in kidney regulation are antidiurectic hormone and ____________.

Fill in the blank(s) with the appropriate word(s).

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Where do plants get most of their mass?

A) from nitrogen in the atmosphere B) from carbon dioxide in the atmosphere C) from water, as van Helmont predicted D) from organic molecules taken up from the soil

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Alternative forms of a gene are called ________

A) alleles B) mutants C) meiotic products D) phenotypes E) genotypes

Biology & Microbiology