Phytoplankton use body size to keep afloat because a small body size ________ surface-area to volume ratio and ________ their frictional resistance.
Fill in the blank(s) with the appropriate word(s).
increases; increases
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Steroids
a. have no fatty-acid component. b. consist of four rings. c. may have different numbers, types, and positions of functional groups attached to them. d. are a specialized type of lipid. e. are described by all of these
In humans, nitric oxide is an important gaseous neurotransmitter. Nitric oxide is synthesized by three isoforms of nitric oxide synthase (NOS). What would be a likely effect if a male were missing the gene that codes for one of the NOS isoforms?
A. He would be unable to produce all the liquid components of semen. B. He would have high levels of mutation within his mature sperm. C. He would have difficulty getting and/or sustaining an erection. D. He would have a low sperm count due to decreased spermatogenesis.
The __________ secretes aldosterone, which targets
the kidney, and __________, the stress hormone. Fill in the blank(s) with the appropriate word(s).
How do terrestrial animals prevent toxic accumulation of ammonia in their tissues?
a. They use ammonia in other metabolic processes. b. They convert ammonia to less toxic forms. c. They vent ammonia across the body wall. d. They eliminate ammonia rather than excreting it. e. Animals do not produce ammonia