An amino acid is to a protein as a ________ is to a nucleic acid.

A. glycerol
B. cellulose
C. nucleotide
D. fatty acid
E. glucose


Answer: C

Biology & Microbiology

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A farmer uses triazine herbicide to control pigweed in his field. For the first few years, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed. Which of these explanations best explains what happened?

A) The herbicide company lost its triazine formula and started selling poor-quality triazine. B) Natural selection caused the pigweed to mutate, creating a new triazine-resistant species. C) Triazine-resistant pigweed has less-efficient photosynthesis metabolism. D) Triazine-resistant weeds were more likely to survive and reproduce.

Biology & Microbiology

As a result of experimentation,

a. more hypotheses may be developed. b. more questions may be asked. c. a new biological principle could emerge. d. entire theories may be modified. e. all of these can occur.

Biology & Microbiology

An interruption to the blood supply of the brain may cause a(n) ________

Fill in the blank(s) with correct word

Biology & Microbiology

________ is a measure of the randomness or disorder of a system.

A. Entropy B. Free energy C. Synergy D. Enthalpy

Biology & Microbiology