The normal human karyotype contains __________ chromosomes
a. 22
b. 23
c. 44
d. 46
e. 54
D
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All evidence suggests that the Neanderthals did not interbreed with our ancestors
A. true B. false
How would the process shown in the illustration be different if this were a plant cell instead of an animal cell?
a. If this were a plant cell, the cells would be larger.
b. If this were a plant cell, the process would result in four cells instead of two.
c. If this were a plant cell, a cell wall would form instead of a contractile ring.
d. If this were a plant cell, the color of the nucleus would be different.
The heath hen, found off the east coast of North America in the eighteenth century, is now extinct. What finally caused its extinction?
A) overexploitation B) pollution C) natural disasters D) habitat loss
Autotrophs that utilize light as their energy source are
A) chemosynthetic autotrophs. B) photoautotrophs. C) fungi. D) heterotrophs.