Hormones travel in the bloodstream yet only certain cells respond. This specificity is due to the presence of _____ in the target cells
1.cell marker proteins
2.channel proteins
3.protein receptors
4.transport proteins
3
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Cell-mediated immune responses, such as attacking and killing microorganisms or host cells that are damaged or infected, are carried out by:
a. lymphocytes of the thymus-derived (T) class. b. lymphocytes of the bone marrow–derived (B) class. c. neutrophils. d. nasophils.
A nauplius larva is characteristic of:
A. echinoderms. B. gastropods. C. molluscs. D. crustaceans. E. ctenophores.
Refer to Figure 26-2. The process occurring in the cells labeled 2 in the sequence is:
a. fertilization.
b. syngamy.
c. the first meiotic division.
d. the second meiotic division.
e. mitosis.
Which test uses radioactive isotopes to label antibodies or antigens in order to detect minute amounts of corresponding antigen or antibody?
A.) Ouchterlony double diffusion B.) Western Blot C.) immunelectrophoresis D.) radioimmunoassay (RIA) E.) the Quellung test