Most organ transplants fail because
a. of poor vascular connection between host and
donor tissue.
b. the migrating leukocytes attack the tissue
adjacent to the transplant.
c. cytotoxic T cells enter the transplant through the
connecting blood vessels and kill the individual
transplant tissue.
d. introduced tissues produce antibodies that cause
a massive reaction.
e. of all of these.
Answer: c
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The graph here shows the results of growing one strain of a crop plant on soils with different nitrogen contents. If a different strain of the same plant were grown on the same soils, you would predict that:
A. it would respond the same way to nitrogen supplementation because they are the same plant. B. it would respond completely differently to nitrogen supplementation because they are different strains. C. it could respond the same way or differently; different genotypes can, but may not always, respond differently to the same range of environments. D. it could respond the same way or differently; the environment has too many variables to predict. E. None of these choices is correct.
In synaptic signaling, neurotransmitters are released into a space that is referred to as a:
A. chemical synapse. B. neuron junction. C. paracrine space. D. gap junction. E. plasmodesmata.
The only epidermal cells with chloroplasts are:a
stomata. b. stoma. c. parenchyma. d. guard cells. e. all of these
From looking at the plant maize plant you conclude:
A) That the missing nutrient is mobile and likely Ca. B) That the missing nutrient is mobile and likely N. C) That the missing nutrient is non-mobile and likely Ca. D) That the missing nutrient is non-mobile and likely N.