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
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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.
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
Superantigens are produced by antigen presenting cells
a. true b. false
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.