Which of the following are greenhouse gases? Check all that apply.

_____ water vapor
_____ molecular oxygen
_____ molecular nitrogen
_____ methane
_____ nitrous oxide


__X__ water vapor
_____ molecular oxygen
_____ molecular nitrogen
__X__ methane
__X__ nitrous oxide

Biology & Microbiology

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Growth factors such as platelet-derived growth factor function in:

A. autocrine signaling. B. paracrine signaling. C. endocrine signaling. D. juxtacrine signaling.

Biology & Microbiology

Which base-pairing system is correct?

a. A to G; T to C b. A to T; G to C c. A to C; G to T d. A to T or C; G to C or A e. A to T or G; G to C or A

Biology & Microbiology

Superantigens are produced by antigen presenting cells

a. true b. false

Biology & Microbiology

Answer the following questions true (T) or false (F)

1. Isotype switching of antibodies is beneficial because some pathogens are able to alter their antigens. 2. A patient with a high antibody titer to a pathogen for which there is no vaccination indicates that this person is currently infected with the pathogen or was infected in the past. 3. Artificial immunity is characterized by short-lived protection immune protection because the patient is not making their own memory cells or antibodies.

Biology & Microbiology