Before an animal cell’s membrane fuses with a virus, the virus must first:a
duplicate its DNA.
b. use enzymes of the plasma membrane to break down its capsid.
c. replicate itself to attack numerous sites of the plasma membrane.
d. extend its tail fibers to sense the plasma membrane of the host cell.
e. attach to a specific receptor on the plasma membrane of the host cell.
e
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The two macronutrients necessary for the production of ATP are
a. calcium and iron. b. calcium and phosphorus. c. phosphorus and nitrogen. d. phosphorus and potassium
Sulfa drugs like Bactrim, given for bacterial infections, inhibit bacteria by blocking folic acid synthesis. The precursor molecule of folic acid is para-amino benzoic acid (PABA). Interestingly, PABA has a structure very similar to a sulfa drug. If a sulfa drug is present, the bacterial enzyme will bind the sulfa drug because of structural similarity. This is an example of ________.
A. competitive inhibition B. noncompetitive inhibition C. catabolite repression D. enzyme repression E. enzyme induction
Which of the following is NOT true of GnRH?
a. it is produced in the hypothalamus b. it causes cells in the anterior pituitary to release FSH c. it causes cells in the posterior pituitary to release LH d. it functions the same in both males and females e. more than one of these is NOT true of GnRH
The first indication that HIV has entered the bloodstream is (are)
a. a rash on the arms and legs. b. a drop in the white blood cell count. c. flulike symptoms. d. Kaposi's sarcoma. e. the development of Kaposi's sarcoma.