A round bacterial cell is called ________
a. columnar
b. bacillus
c. coccus
d. cuboidal
e. spirillum
c
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A liger is an offspring produced from a mating between a male lion and a female tiger. Male ligers cannot produce offspring. This is an example of
A. a prezygotic mechanism. B. hybrid inviability. C. hybrid sterility. D. hybrid breakdown. E. a prezygotic mechanism and hybrid sterility are correct.
How is simple diffusion different from other types of passive transport?
a. Simple diffusion does not require a permease. b. Simple diffusion requires ATP. c. Simple diffusion only brings material into the cell, not out of it. d. Simple diffusion is only the diffusion of water.
Based on evidence from "primate molecular clocks," a primate common ancestor of humans and chimpanzees existed about:
A) 6—7 million years ago. B) 4—5 million years ago. C) 3 million years ago. D) 10 million years ago.
The carbon cycle is based on carbon dioxide. CO2 makes up about
A. 3% of the atmosphere. B. 0.03% of the atmosphere. C. 0.3% of the atmosphere. D. 0.003% of the atmosphere. E. 30% of the atmosphere.