The reason that some individual hormones have so many different effects is that
a. they influence gene transcription.
b. they trigger a second messenger system that produces a cascade of effects.
c. there are a great many different cells in different tissues that have specific receptors for the
hormone.
d. the hormone is carried throughout the body and only a small amount is needed to produce
its effect.
e. they are realeased in different concentrations.
C
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Which of the following statements does not accurately describe the navigational ability of homing in birds?
A. Homing pigeons have map sense, which most likely includes landmarks as well as olfactory and visual cues. B. Homing pigeons use the sun and stars as well as the magnetic field to find their way "home" over long distances. C. If a homing pigeon is fitted with a magnetic helmet, it would not be able to find its way on a cloudy day. D. If a homing pigeon is fitted with a magnetic helmet, it would not be able to find its way on a cloudy day, but it would be able to navigate on a sunny day because it would still be able to use the sun as a compass. E. A biological clock used for time cues is not necessary for a homing pigeon to use the sun compass.
The method of movement that requires the
expenditure of ATP molecules is a. simple diffusion. b. facilitated diffusion. c. osmosis. d. active transport. e. bulk flow.
Which cellular protein is found in desmosomes?
A) tubulin B) occludins C) dynein D) cadherins E) connexons
Most invertebrates, such as the annelid, have nephridia.
Answer the following statement true (T) or false (F)