Which of the following is a waste product of nitrogen metabolism in some amniotes that is low enough
in toxicity that it can thus be excreted as a semisolid paste, reducing water loss?
a. nitric oxide
b. uric acid
c. squalene
d. urea
e. ammonium
B
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Pleiotropy refers to:
A. the interaction of two genes affecting a single trait. B. the interaction of multiple genes affecting multiple traits. C. the interaction of multiple genes affecting a single trait. D. a single gene having multiple effects. E. two different norms of reaction for a single trait.
Antibiotics that affect various strains of Gram-positive bacteria and various strains of Gram-negative bacteria are called
A. isolate usable. B. stress-induced. C. narrow-spectrum. D. broad-spectrum.
Plants lack organ systems for disposing of toxic metabolic waste products. Their cells’ vacuoles are like what animal
cell organelle? a. nucleolus b. lysosomes c. chloroplasts d. mitochondria e. endoplasmic reticulum
The number of new cases of a disease in a population over a specific period of time compared with the healthy population is the
A. mortality rate. B. incidence rate. C. epidemic rate. D. prevalence rate. E. morbidity rate.