Frozen human sperm were first used to conceive a child in

A) 1910.

B) 1953.

C) 1969.

D) 1978.


B) 1953.

Biology & Microbiology

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T cell response to T-dependent antigens requires

A. binding of the T cell to a class II MHC receptor on a macrophage. B. typically a protein antigen. C. binding of the T cell to a site on the antigen. D. interleukin-1 activating the T helper cell. E. All of the choices are correct.

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Another term for urination is______

Fill in the blank(s) with correct word

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The action of neurotransmitters is very fleeting due to their prompt removal from the synaptic cleft. All of the following are strategies for rapid removal of neurotransmitters EXCEPT ________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

During embryonic development, the skeleton is initially made of ________, which is later replaced by bone

Fill in the blank(s) with correct word

Biology & Microbiology