The type of contraception technique that prevents implantation (even after successful fertilization) is
a. tubal ligation.
b. spermicidal jelly.
c. birth control pills.
d. intrauterine device.
e. a diaphragm.
D
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Which of the following statements is true regarding how R groups affect ?-helix stability?
A. Adjacent, oppositely charged side chains can increase stability. B. Due to its small size, glycine increases stability. C. Bulky R groups create stabilizing van der Waals forces. D. Since they are located on the exterior of the ? helix, R groups do not significantly alter stability. E. None of these answers is correct.
Which system produces blood cells?
a. endocrine b. skeletal c. muscular d. defense e. integumentary
A linear stretch of DNA that specifies the sequence of amino acids in a polypeptide is called a(n)
a. codon. b. intron. c. messenger. d. gene. e. enzyme.
What process occurs when potassium ions diffuse out of a nerve cell and the inside of the cell again becomes more negative than the outside?
A) depolarization B) polarization C) repolarization D) threshold