Which characteristic(s) of urine help it to bar pathogens from the urinary tract?

a. a high pH
b. mucous production
c. a low pH
d. ammonia concentrations
e. urea


C

Biology & Microbiology

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What is the difference between negative feedback and positive feedback mechanisms?

A. Negative feedback mechanisms return a system to a set point; positive feedback mechanisms amplify a response. B. Negative feedback mechanisms move away from a set point; positive feedback mechanisms stabilize toward a set point. C. Negative feedback mechanisms stabilize a system toward a set point; positive feedback mechanisms change the set point.

Biology & Microbiology

The external morphological traits of two North American species of tree frog (Hyla versicolor and H. chrysoscelis) are

very similar; therefore, scientists use ____ to distinguish them.

a. internal anatomy b. behavioral traits c. homologous appendages d. skin coloration e. analogous structures

Biology & Microbiology

The production of female gametes begins when a mass of tissue, called the ovule, starts growing on the inner wall of

a(n) __________. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Which of the following is a likely physiological effect of caffeine ingestion?

A. decrease in blood glucose levels B. decrease in central nervous system activity C. extreme increase in diuretic effects D. release of proteins into the bloodstream E. increased metabolic rate

Biology & Microbiology