What atom forms the backbone of almost all biological molecules?
A) hydrogen
B) nitrogen
C) carbon
D) sulfur
E) phosphorus
Answer: C
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All of the following hormones are lipids derived from cholesterol EXCEPT
A. melatonin. B. estradiol. C. cortisol. D. aldosterone. E. testosterone.
Which of the following exhibit phagocytic activity?
A. lymphocytes B. macrophages C. neutrophils D. lymphocytes and macrophages E. macrophages and neutrophils
The exchange of chromosome regions between homologous chromosomes during meiosis is known as ____
a. irradiation damage b. crossing over c. chromosomal aberration d. fertilization e. spindle fiber formation
A(n) __________ bacterium would not be able to survive in the presence of oxygen
a. facultative aerobic b. facultative anaerobic c. facultative autotrophic d. obligate aerobic e. obligate anaerobic