Sphingomyelin contains two hydrocarbon chains linked to _______ rather than to glycerol.
a. choline
b. serine
c. glycine
d. tyrosine
Ans: b. serine
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The division of a bacterial cell occurs as the:
A. cell wall develops cracks around the equator of the cell. B. chromosomes are pulled toward the ends of the cell. C. actin and microtubules constrict the cytoplasm. D. new membrane and cell wall materials begin to grow and form a septum.
Respiration is measured in a human. How do the concentrations of O2 and CO2 in inhaled air compare with exhaled air?
A. Inhaled air has less O2 and more CO2 than exhaled air. B. Inhaled air has more O2 and less CO2 than exhaled air. C. Inhaled air has more O2 and CO2 than exhaled air. D. Inhaled air has less O2 and CO2 than exhaled air.
Eutrophication can lead to
a. an algal bloom. b. fish congregations. c. decreased water clarity. d. slow plant growth rates. e. a and c only.
India is in which demographic transitional stage?
a. birth and death rates equally high; growth rate low b. death rate dropping fast; birth rate declining but slowly c. birth rates declining and approaching the death rates d. birth rate falling below death rate; population size decreasing e. death rate greatly exceeds birth rate; population is close to extinction