In humans, skin color is controlled by several genes. Thus, skin color is a(n) ____ characteristic

a. dominant
b. co-dominant
c. epistatic
d. pleiotropic
e. recessive


Answer: c

Biology & Microbiology

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The term amphipathic refers to those molecules that are

A) hydrophilic. B) hydrophobic. C) charged at both ends but with opposite charges. D) nonpolar at both ends. E) charged at one end and nonpolar at the other.

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A lack of T cells makes one more vulnerable to intracellular parasites

Indicate whether this statement is true or false.

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Which statement is true?

a. The partial pressure of oxygen is greater in ambient air than in the blood. b. The partial pressure of oxygen is identical in arterial and venous blood. c. The partial pressure of CO2 is greater in ambient air than the blood. d. The partial pressure of CO2 is greater in arterial blood than venous blood.

Biology & Microbiology

The most widespread and fastest growing STD in the

United States is a. chlamydia b. human papillomavirus infection c. genital herpes d. gonorrhea e. trichomoniasis

Biology & Microbiology