Which of the following does not occur?
a) radially symmetrical diploblast
b) diploblastic eucoelomate
c) protostomic coelomate
d) bilaterally symmetrical deuterostome
Ans: b) diploblastic eucoelomate
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Explain how Escherichia coli can grow with a doubling time of 20 minutes when chromosome replication takes 40 minutes
What will be an ideal response?
The IMMEDIATE ancestors of humans (genus Homo) were the:
A. chimpanzees B. australopithecines C. prosimians D. gibbons
During eye examinations, a test is done to monitor the pressure within the eye. This test is done to detect
A) detachment of the retina. B) glaucoma. C) macular degeneration. D) astigmatism. E) cataracts.
Earth's ozone layer is extremely important because it
A) traps harmful infrared rays. B) blocks incoming UV radiation, which is damaging to animals and reduces photosynthesis in plants and algae. C) blocks incoming visible light to protect Earth against the greenhouse effect. D) maintains high carbon dioxide concentrations so that photosynthesis can occur. E) traps heat so that Earth's temperature does not fall too much.