Plant cells called ____ make up the bulk of the soft primary growth of roots, stems, leaves, flowers, and fruits
a. sclerenchyma
b. tracheids
c. collenchyma
d. parenchyma
e. vessel members
ANSWER: d
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The indicator used to determine whether anaerobic conditions are achieved in an anaerobic jar is:
a. phenol red. b. bromothymol blue. c. methylene blue. d. methyl red.
Which feature is shared by euglenoids and kinetoplastids?
a. an eyespot b. flagellated c. photoautotrophy d. parasitic existence e. marine and freshwater habitats
Which of the following best describes the pathway an oxygen molecule would take through the human circulatory system?
A) systemic tissues ? alveoli ? pulmonary vein ? pulmonary capillaries ? systemic capillaries ? left ventricle ? left atrium ? aorta ? systemic arteries B) alveoli ? pulmonary capillaries ? pulmonary vein ? left atrium ? left ventricle ? aorta ? systemic arteries ? systemic capillaries ? systemic tissues C) alveoli ? pulmonary capillaries ? pulmonary artery ? right atrium ? right ventricle ? pulmonary vein ? systemic arteries ? systemic capillaries ? systemic tissues D) alveoli ? pulmonary vein ? pulmonary capillaries ? systemic capillaries ? left atrium ? left ventricle ? aorta ? systemic arteries ? systemic tissues
Unsaturated fatty acids cause a membrane to be fluid at lower temperatures. What is a reasonable explanation for this?
a. Unsaturated fatty acids permit more water into the interior of the membrane. b. The double bonds form a kink in the fatty acid tail, forcing adjacent lipids to be spaced farther apart. c. The double bonds in the unsaturated fatty acids block interaction among the hydrophilic head groups of the lipids. d. Unsaturated fatty acids have a higher cholesterol content.