Which part of a cholesterol molecule is polar?

A. The OH group
B. The four interconnected planar rings
C. The hydrocarbon tail
D. Both the four interconnected planar rings
and the hydrocarbon tail


Answer Key: A

Biology & Microbiology

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In humans, blue eyes are inherited as a recessive autosomal trait and color blindness is an X-linked recessive trait. A woman with blue eyes and normal color vision whose father was color blind marries a man who also has normal color vision

He has brown eyes, but his mother had blue eyes. Which of the following would you expect to be true for their sons? A) One-half of their sons will have normal color vision and brown eyes; 1/2 of their sons will have normal color vision and blue eyes. B) Their sons will all have normal color vision and brown eyes. C) One-fourth of their sons will be color blind and have blue eyes, 1/4 of their sons will be color blind and have brown eyes, 1/4 of their sons will have normal color vision and blue eyes, 1/4 of their sons will have normal color vision and brown eyes. D) Their sons will all have normal color vision and blue eyes. E) One-half of their sons will be color blind and have blue eyes; 1/2 their sons will be color blind and have brown eyes.

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The hole in the ozone layer is most dramatic over ____

a. Antarctica b. North America

c. Asia d. Europe e. Africa

Biology & Microbiology

The root tip is indicated by

a. A. b. B. c. C. d. D. e. E.

Biology & Microbiology

If nondisjunction occurs during meiosis,

a. the resulting sex cells will be heterogametes. b. one-half of the resulting cells will exhibit trisomy and the other half monosomy. c. diploid cells will be produced. d. all gametes would lack a chromosome and these gametes would be infertile. e. none of the gametes will be capable of achieving fertilization.

Biology & Microbiology