What pattern of cleavage is characteristic of mammals?
A. holoblastic cleavage with eggs containing little or no yolk
B. some yolk, and cleavage resulting in vegetal and animal poles
C. meroblastic cleavage with eggs containing almost entirely yolk
D. holoblastic cleavage with eggs containing very little yolk, but with the inner cell mass concentrated at one pole
E. holoblastic cleavage with eggs containing very little yolk, but with the inner cell mass distributed uniformly
D. holoblastic cleavage with eggs containing very little yolk, but with the inner cell mass concentrated at one pole
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Which of the following is likely a symptom of exposure to the venom latrotoxin?
a. malfunction of sodium–potassium pumps b. paralysis c. constant muscular contractions d. continuous action potentials along axons
The systems that coordinate communication are
A. skeletal and muscular. B. circulatory and respiratory. C. nervous and endocrine. D. digestive and circulatory. E. urinary and immune.
Which of these is not part of the life cycle of brown algae?
A. spores produced by mitosis B. multicellular haploid stage C. meiosis D. multicellular diploid stage E. gametes produced by mitosis
The hundreds of species of Drosophila in Hawaii exhibit different mating rituals. This isolating mechanism is
A. postzygotic and mechanical. B. prezygotic and ecological. C. prezygotic and behavioral. D. prezygotic and geographical. E. prezygotic and temporal.