In a DNA molecule, the letters, A,T,C and G represent
a. bases
b. sugars
c. starches
d. proteins
Answer: a. bases
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Atherosclerosis
a. decreases the size of the lumen of arteries. b. effects the diameter of veins. c. has no effect on the size of the lumen of arteries. d. increases the size of the lumen of arteries. e. presents many clinical symptoms immediately.
If cell X enters meiosis, and nondisjunction of one chromosome occurs in one of its daughter cells during meiosis II, what will be the result at the completion of meiosis?
A) All the gametes descended from cell X will be diploid. B) Half of the gametes descended from cell X will be n + 1, and half will be n - 1. C) 1/4 of the gametes descended from cell X will be n + 1, 1/4 will be n - 1, and 1/2 will be n. D) Two of the four gametes descended from cell X will be haploid, and two will be diploid.
Cellular adaptive immunity is carried out by ________.
A) B cells B) T cells C) bone marrow D) neutrophils
The half-life of a radioactive isotope is 10,000 years. This isotope and its breakdown product do not normally occur together before molten rock cools and becomes solid. You analyze a volcanic rock and find 25 percent of the original amount of
radioactive isotope remains, and 75 percent has decayed to its daughter element. How long ago did the rock solidify? A) 2,500 years ago B) 20,000 years ago C) 50,000 years ago D) 10,000 years ago