The process involving microspore division and a tough wall to protect the gametophyte leads to the production of what end product?
A. eggs
B. ovules
C. pollen
D. anthers
E. stamens
C. pollen
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The basal cell in a plant embryo _____
A) develops from the root of the embryo B) forms the suspensor that anchors the embryo C) divides to form hypocotyls D) divides to form cotyledons
Assume a neuron receives EPSPs and IPSPs from several adjacent neurons. How might that neuron's
threshold potential be reached, causing it to produce its own action potential?
a. if IPSPs outnumber EPSPs b. temporal summation c. spatial summation d. temporal and spatial summation e. if IPSPs equal EPSPs
A chicken somatic cell carries 78 chromosomes. A chicken sperm cell will contain how many chromosomes?
a. 19 b. 39 c. 78 d. 156 e. 312
Which of the following is the major reason why it has been difficult to treat viral infections with chemotherapeutic agents?
A. Viruses have no metabolism and therefore offer no selective point of attack. B. Actually, viruses are not difficult to treat with chemotherapeutic agents. C. Viruses use the metabolic machinery of their hosts, which limits many of the potential points of attack. D. Viral metabolism resembles that of their hosts so there is no selective point of attack.