After one minute without oxygen, brain cells begin to die. After three minutes, this damage is likely to cause severe
neurological deficits. The dependence of brain cells on oxygen for survival indicates that these cells are ____.
a. strict aerobes
b. strict anaerobes
c. facultative aerobes
d. facultative anaerobes
e. transitional aerobes
ANSWER: a
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Four of the five answers listed below are characteristics of the tropical rain forest. Select the exception
a. vines and epiphytes b. great diversity c. structurally complex d. nutrient poor soil e. large herds of herbivores
Consider the 4.6-billion-year history of the Earth. Geological and fossil evidence indicates that during the greatest fraction of its history, the Earth
a. was too hot to have either a solid surface or any form of life. b. had organic molecules in liquid water, but no living forms. c. had unicellular organisms, but not multicellular. d. had both multicellular and unicellular organisms, but no terrestrial (land) forms. e. had both terrestrial, freshwater, and marine organisms, both unicellular and multicellular.
The difference between normal and sickle-cell
hemoglobin is based upon
a. the number of amino acids in the molecule. b. the substitution of one amino acid for another. c. the number and orientation of the amino acid chain attached to the heme portion of the molecule. d. the number of oxygen molecules that can be carried. e. the types of bone marrow that produce it.
The first plants to produce seeds evolved during the:a
Mesozoic era. b. Devonian period. c. Cenozoic era. d. Jurassic period. e. Cretaceous period.