Which of the following statements best describe the way molecules move across a plasma membrane?
A. Lipid molecules do not pass through the plasma membrane easily.
B. Charged molecules pass through the plasma membrane easily.
C. Large molecules pass through the plasma membrane easily.
D. Small, uncharged molecules pass through the plasma membrane easily.
E. Water and gas molecules require "helper" proteins to move through the plasma membrane.
Answer: D
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Organisms that are not drastically affected by increased pressure are called
A. osmophilic. B. barophilic. C. barotolerant. D. osmotolerant.
Which of the following does NOT belong with the others?
A. replication fork B. single-stranded binding proteins C. DNA ligase D. topoisomerase E. helicase
Which two food chains are characteristic of nearly all food webs?
a. Grazing, carnivorous b. Producing, carnivorous c. Grazing, detrital d. Detrital, producing e. Producing, decomposing
During DNA replication, complementary nucleotides are added to the separated strands of the original DNA by enzymes. Which one of the following bases would a nucleotide contain if it were paired to a nucleotide containing thymine?
A) adenine B) uracil C) another thymine D) cytosine E) guanine