Testosterone is an example of a chemical signal that affects the very cells that synthesize it, the neighboring cells in the testis, along with distant cells outside the gonads. Thus, testosterone is an example of
A) an autocrine signal.
B) a paracrine signal.
C) an endocrine signal.
D) both an autocrine signal and a paracrine signal.
E) an autocrine signal, a paracrine signal, and an endocrine signal.
Answer: E) an autocrine signal, a paracrine signal, and an endocrine signal.
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Chlorosis in plants is a condition best explained by:
A. lack of water. B. lack of certain minerals. C. lack of oxygen. D. lack of carbon dioxide. E. lack of soil moisture.
The parts of the genome that are used in markers of identity in DNA profiling
A) are in Hardy-Weinberg equilibrium and therefore not affected by natural selection acting on a phenotype. B) are in Hardy-Weinberg equilibrium and therefore not affected by natural selection acting on a genotype. C) are not in Hardy-Weinberg equilibrium and therefore not affected by natural selection acting on a phenotype. D) are not in Hardy-Weinberg equilibrium and therefore not affected by natural selection acting on a genotype.
A tuna is a ___ fish
a. ray-finned b. lobe-finned c. cartilaginous d. jawless e. invertebrate
The formation of _____ depends on gene action, interactions within the embryo, interaction with other embryos that
may be in the uterus, and interactions with the maternal environm Fill in the blank(s) with the appropriate word(s).