Plants are more readily manipulated by genetic engineering than are animals because _____
A) plant genes do not contain introns
B) more vectors are available for transferring recombinant DNA into plant cells
C) a somatic plant cell can often give rise to a complete plant
D) genes can be inserted into plant cells by microinjection
E) plant cells have larger nuclei
Answer: C
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Synaptic vesicles discharge their contents by exocytosis at the
A. dendrite. B. axon hillock. C. nodes of Ranvier. D. postsynaptic membrane. E. presynaptic membrane.
The broad categories of grasses, shrubs, and trees represent a diverse range of species and characteristics, and they have fundamentally different patterns of
A) nutrient allocation and morphology. B) carbon allocation and morphology. C) carbon allocation and nutrient allocation.
In woody plants, the root epidermis is replaced by periderm
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Why is it necessary for the testes to be in the scrotum to function properly?
A) The scrotum keeps the testes at a cool temperature necessary for sperm production. B) The sperm are produced in the scrotal tissue and transferred to the testes to finish maturation. C) The scrotum contains alkaline fluids to nourish the sperm. D) The testes develop from scrotal tissues. E) The scrotum elevates the temperature of the testes, which increases sperm production.