Nearly all animals rely on three main molecules as sources of energy and building blocks for growth and development. They are:

A. carbohydrates, proteins, and amino acids.
B. nucleic acids, carbohydrates, and lipids.
C. proteins, fats, and carbohydrates.
D. carbohydrates, amino acids, and lipids.
E. sugars, proteins, and fats.


C

Biology & Microbiology

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Guanine and uracil are examples of nitrogenous bases.

a. true b. false

Biology & Microbiology

Which of the following statements concerning specific immunity is FALSE?

A) It is the third line of defense. B) It has memory. C) It changes little with repeated exposure to the same pathogen. D) It is acquired. E) It is the body's ability to respond to specific invading pathogens.

Biology & Microbiology

Selecting for transformants involves

A. identifying organisms that have taken up recombinant DNA. B. searching for RNA. C. production of proteins. D. production of DNA.

Biology & Microbiology

In __________ selection, individuals with a phenotype near the mean are favored over those at the

phenotypic extremes. a. directional b. disruptive c. stabilizing d. frequency-dependent e. natural

Biology & Microbiology