Which of the following types of reproductive barriers separates a pair of moth species that could interbreed but for the fact that the females' mating pheromones are not attractive to the males of the other species?
A) temporal isolation
B) behavioral isolation
C) mechanical isolation
D) gametic isolation
Answer: B
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The entrance into the cavity formed during gastrulation in sea stars and frogs is called the
(a) archenteron. (b) blastocoel. (c) blastocyst. (d) blastopore.
Which of the following is a reactant of the Calvin cycle?
a. carbon dioxide b. glucose c. oxygen d. water
The cessation of regular menstrual cycles due to age is called ____
a. menopause b. the luteal phase c. the follicular phase d. PMS e. menstruation
How does the toxin from Clostridium tetani produce its action?
A. it fuses irreversibly to neurons, blocking release of acetylcholine at synaptic clefts. B. the smaller polypeptide of its toxin can block the release of inhibitory neurotransmitters by inhibitory neurons in the central nervous system. C. it is a pyrogenic toxin, which triggers a diffused rash and, later, sloughing of skin. D. it destroys tissues, including muscle and fat. E. Antibodies to the toxin bind the neuromuscular junctions in skeletal muscle preventing relaxation.