Three molecules that easily diffuse through the plasma membrane are oxygen, carbon dioxide, and urea.

a. true
b. false


Answer: a. true

Biology & Microbiology

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An excess of synonymous to non-synonymous differences the FoxP2 sequence of humans relative to the FoxP2 sequence of chimpanzees implies that:

A. FoxP2 is a highly conserved transcription factor. B. The function of FoxP2 has been under positive selection in the human lineage but that the expression pattern of FoxP2 has not. C. The expression pattern of FoxP2 has been under positive selection in the human lineage but that the function of FoxP2 has not. D. The function of FoxP2 has been under positive selection in the human lineage. No inferences regarding the effect of positive selection acting on the expression pattern of FoxP2 are possible based on these data.

Biology & Microbiology

One way that sulfur enters the atmosphere is through volcanic activity

Indicate whether the statement is true or false

Biology & Microbiology

The term Protista was used earlier to separate out the archaea from the true bacteria.

a. true b. false

Biology & Microbiology

Vaccination has been proven to be linked to autism.

Indicate whether the statement is true or false.

Biology & Microbiology