Testosterone has important regulatory functions in humans and many other animals. Molecules with regulatory
functions like testosterone are called ____.
a. phytosterols
b. enzymes
c. lipoproteins
d. hormones
e. receptors
ANSWER: d
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Albinism is a recessive disorder. Rapinder is
an albino and his partner, Janeen has normal pigmented skin. Her father was also an albino. Janeen is pregnant and Rapinder is the father. What is the probability that they will have normal pigmented child?
a. 0% b. 25% c. 50% d. 75% e. 100%
Which word best describes the structure of the cell membrane?
A.) bi-layer B.) rigid C.) impermeable D.) nonpolar
The reason that the steroid hormone aldosterone affects only a small number of cells in the body is that _____
A) only its target cells get exposed to aldosterone B) only its target cells contain aldosterone receptors C) it is unable to enter nontarget cells D) nontarget cells destroy aldosterone before it can produce any effect
Which statement about tropical forests is true?
A) Tropical forests occur in equatorial regions with very long (16- to 20-hour) days. B) Tropical forest structure consists of distinct layers that provide many different habitats. C) Once stripped, tropical rain forests regrow quickly, although with slightly less diversity. D) The soils of tropical rain forests are typically rich in nutrients.