During the inflammatory response, which cells release histamine?
a. T cells
b. mast cells
c. macrophages
d. neutrophils
e. eosinophils
ANSWER: b
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Mutants of Drosophila melanogaster have been used extensively to explore the genetic control of early development,x
particularly the hierarchical control of development, which means that genes expressed at each stage control the expression of genes that act later. A. true B. false
Physiological changes in ectotherms that change their temperature tolerance as the seasons change
from winter to summer are called
a. estivation. b. hyperthermia. c. thermal acclimatization. d. hypothermia. e. hibernation.
Which of the following tissue types are found only in the zone of cell division of the root tip?
A. ground meristem B. endodermis C. xylem & phloem D. None of these are restricted to just the zone of cell division of the root tip. E. All of these are restricted to the zone of cell division of the root tip.
The replacement fertility rate is ____.
A. the average number of children a man must sire to replace himself with a son who reaches reproductive age B. the average number of children woman must bear to replace herself with one daughter who reaches reproductive age C. the average number of children born per year in a population D. the birth rate minus the death rate of a population E. the number of boy–girl pairs born each year in a population