This protein functions in muscle contraction.
a. Keratin
b. Hemoglobin
c. Actin
d. Insulin
e. Pepsin
Ans: c. Actin
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Trypanosoma and Leshmania species are transmitted by
A) direct person-to-person contact. B) insect vectors. C) contaminated food or water. D) contaminated needles and syringes.
The anterior pituitary secretes more ACTH, leading to more glucocorticoids in plasma, which causes the anterior
pituitary to then secrete less ACTH. This is an example of ____ regulation.
a. amplification only b. positive feedback only c. negative feedback d. cascading feedback e. both amplification and positive feedback
The salinity of seawater at the equator is:
a. high due to evaporation. b. low due to precipitation. c. high due to freezing. d. low due to river input.
The main function of salivary mucus is to ____
a. break down starch b. mechanically breakup food materials c. make the food particles sticky d. hydrate dry food particles e. coat food particles so they slide down the esophagus