The maintenance of a constant internal environment is 

A. positive feedback.
B. negative feedback.
C. homeostasis.
D. positive regulation.


C. homeostasis.

Biology & Microbiology

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In gymnosperms and angiosperms, a plant embryo (young sporophyte) packaged with a food supply in a tough outer coat is a

A. sperm. B. seed. C. pollen grain. D. gemmae. E. fruit.

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______ ______is a process by which bacteria use chemical signally for communication, and has been found to play a role in establishing an effective microbial attack against a host

Fill in the blank(s) with the appropriate word(s).

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In cats, the dominant white gene (W) may or may not also cause deafness. Homozygotes are more likely to be deaf than heterozygotes

If you breed heterozygous white cats together and produce 100 kittens, how many would you expect to be deaf if all the proportions came out perfectly? Assume that heterozygotes have an 8% chance of being deaf, and homozygotes a 60% chance of being deaf.

Biology & Microbiology

In comparison to the systemic circuit, the pulmonary circuit

A) transports deoxygenated blood. B) has lower resistance to blood flow. C) has an equal pressure gradient to drive blood flow. D) has lower blood flow. E) is under greater pressure.

Biology & Microbiology