Which of the following is (are) among the most
effective contraceptive approaches?
a. abstinence
b. tubal ligation
c. vasectomy
d. hormonal implant
e. all of these
Answer: e
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What substance will release hydrogen ions when its concentration is low, and accept them when its concentration is high?
1.salt 2.acid 3.base 4.buffer 5.alkali
Where in the DNA molecule are hydrogen bonds?
a. between sugars b. between phosphates c. between sugar and phosphate d. between bases e. in the backbone
Nonsteroid hormones differ from steroid hormones in that they
A) cause a change to occur in the target cell. B) bind to an intracellular receptor. C) are water insoluble. D) cannot be stored. E) bind to a receptor on the outer surface of the cell membrane.
_______ can convert proto-oncogenes into oncogenes.
A. Chromosomal translocations B. Gene amplifications C. Retroviral insertions D. Missense mutations E. All of the answers are correct.