A ____ secretes a chemical message for the purpose of cellular communication
a. muscle
b. neuron
c. keratinocyte
d. fibroblast
e. platelet
ANSWER: b
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In sea urchins, the "fast block" and the longer lasting "slow block" to polyspermy, respectively, are _____
A) the acrosomal reaction and the formation of egg white B) the cortical reaction and the formation of yolk protein C) the jelly coat of the egg and the vitelline membrane D) membrane depolarization and the cortical reaction E) inactivation of the sperm acrosome
Alternation of generations is found in some
A. fish. B. tapeworms. C. jellyfish. D. insects.
The lymphatic system differs from the bloodstream in that
A) the bloodstream is a one-direction system. B) the lymph is moved via the help of a pump that pushes the fluid through the vessels. C) the lymph system is a multi-directional system with vessels concentrated at the "dead-end" areas of the hands, feet, and breast. D) lymph flow is dependent on muscle movement.
Assuming the value of linkage disequilibrium, D, is positive, recombination will gener-ate:
a. more repulsion pairs generated. b. more coupling pair generated. c. no change since recombination does not change expected haplotype fre-quencies. d. an increase in D. e. None of the above.