When substances move across a plasma membrane and down concentration gradients, this is called
A) pinocytosis. B) active transport. C) passive transport. D) exocytosis.
C
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The two types of secondary structure interactions are referred to as:
A. primary and secondary. B. amide and carbonyl. C. residual and permanent. D. -helix and -sheet. E. sulfhydryl and phosphatidic.
Which of the following statements correctly describes any chemical reaction that has reached equilibrium?
A) The concentrations of products and reactants are equal. B) The reaction is now irreversible. C) Both forward and reverse reactions have halted. D) The rates of the forward and reverse reactions are equal.
All seed plants are described as ________ because their sporophytes have two types of sporangia that produce sexually different spores.
A. Heterosporous B. Polypoids C. Homosporous D. Monoecious E. Dioecious
Recall the classic experiments assessing arthropod extinction rates in moss (Figure 46.14). If corridors are eliminated between moss patches, how does this change affect the arthropods inhabiting the moss?
A. Arthropod extinction rates remain the same. B. Arthropod extinction rates decrease. C. Arthropod extinction rates increase.