Members of which group are one of the most important producers in marine ecosystems, although
sometimes they form blooms known as red tides?
a. green algae
b. red algae
c. euglenoids
d. dinoflagellates
e. brown algae
D
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Small size, in general, is necessary for all cells, whether prokaryotic or eukaryotic. Why?
a. The surface area to volume ratio limits the size of all cells. b. If cells were larger, they would be eaten by predators. c. Size is limited by electron orbitals. d. They are limited by the size of the ecosystem.
Choose the proper item below for statements 54–57
a. operon b. operator c. promoter d. lactose M 54. This item contains regulator, promoter, and operator regions. D 55. A repressor protein can shut down transcription by binding to this item. M 56. This item codes for the production of a repressor. D 57. When the repressor is inactivated, RNA polymerase can bind to this item and allow transcription to occur.
In the lipid bilayer of the plasma membrane, the fatty acid tails of the phospholipids face one another in the center of the membrane.
a. true b. false
At sea level the air pressure which equals 1 atmosphere is
A) 150 mm Hg. B) 100 mm Hg. C) 600 mm Hg. D) 500 mm Hg. E) 760 mm Hg.