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 effect.
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. all of these are true.
Answer: c
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If the diploid number of chromosomes in mouse somatic cells is 40, how many chromosomes are present during
prophase I?
a. 40, each comprised of a single paternal or maternal chromosome b. 80, each comprised of a pair of homologous chromosomes c. 20, each comprised of a single sister chromatid d. 80, each comprised of a single sister chromatid e. 40, each containing a pair of sister chromatids
What are thermoreceptors NOT used for?
a. Some animals use thermoreceptors to locate warm-blooded prey.
b. Some animals use thermoreceptors to help regulate their own body temperature. c. Some animals use thermoreceptors to reduce exposure to extreme temperatures that are damaging to cells and tissues. d. Some animals use thermoreceptors to trigger involuntary responses related to body temperature. e. Some animals use thermoreceptors to locate ectothermic prey.
In a cell signalling pathway there can be more than one sensor.
a. true b. false
________ is the consuming of one organism by another.
Fill in the blank(s) with the appropriate word(s).