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
Answer: A
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Which of the following statements regarding the figure above is true?
A) Immigration rates are higher on smaller islands. B) Extinction rates are highest on large islands close to the mainland. C) Species richness should be higher on larger islands close to mainland. D) Species diversity should be highest on larger islands away from mainland.
DNA profiling is helpful in
A) curing cancer. B) analyzing food. C) treating male infertility. D) preventing male pattern baldness.
During which days of the ovarian cycle is the oocyte ovulated?
a. 12 - 15 b. 16 - 19 c. 0 - 4 d. 24 - 28 e. 3 - 6
A dihybrid cross produces 30 recombinant offspring out of a total of 1,000 offspring. What is the recombination frequency of the two gene pairs?
A) 6% B) 3% C) 30% D) 1.5%