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
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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.
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
Guanine and uracil are examples of nitrogenous bases.
a. true b. false
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.