In mammalian defenses against invading pathogens, all of these are considered nonspecific defense mechanisms EXCEPT
A. acquired immunity.
B. the skin.
C. mucous membranes.
D. the inflammatory response.
E. antimicrobial proteins (e.g., interferon).
A. acquired immunity.
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The term "plankton" ____
a. refers to a taxonomic division of algae b. is a common term for microscopic organisms that drift or swim weakly in water c. includes only multicellular forms d. refers to small aquatic plants e. would apply to large brown algae
A dangerous form of diarrhea complicated by anemia may be caused by
a. Staphylococcus aureus. b. Clostridium botulinum. c. Escherichia coli. d. Mycobacterium tuberculosis. e. Helicobacter pylori.
Which of the following is/are NOT TRUE about anal stimulation?
a. Using more than one condom is essential in performing anal intercourse. b. Analingus is oral stimulation of the anus. c. For anal intercourse the inserting partner needs to keep the penis or object tilted in the direction of the colon d. It is essential that sex toys inserted into the anus for anal stimulation have a larger base than tip to avoid it become trapped inside of the anal sphincter. e. Answers a and b are NOT TRUE
Which statement about steroid hormones is true?
A) Steroid hormones cause the production of cAMP. B) Steroid hormones are polar molecules that cannot pass through the cell membrane. C) Steroid hormones bind to receptors in the plasma membrane. D) Steroid hormones bind to specific receptor proteins, and the complex acts as a gene activator.