The control of an organism's body temperature is
What will be an ideal response?
thermoregulation.
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Aldosterone is a hormone secreted by the adrenal cortex, and insulin is a peptide secreted by the pancreas
When aldosterone contacts a target cell, it binds to an intracellular receptor and migrates to the nucleus; insulin binds to extracellular receptors on the plasma membrane. What is the most likely reason for this difference? A. Aldosterone is hydrophilic and therefore must enter the aqueous environment of the cytoplasm to have an effect. B. Aldosterone is lipid-soluble and therefore easily crosses the phospholipid bilayer of the plasma membrane. C. Aldosterone is too small to bind extracellular receptors on the plasma membrane. D. Insulin is too large to interact with DNA.
Periwinkle snails prefer to feed on the green alga Enteromorpha. In tide pools, Enteromorpha, which other alga
species, while in areas exposed at low tide, the red alga Chondrus outcompetes Enteromorpha. How did these feeding and competing interactions affect the algal populations?
a. Periwinkles decreased species richness in both tide pools and exposed areas. b. Periwinkles eliminated all of the less dominant algal species. c. Periwinkles eliminated the dominant algae entirely. d. Periwinkles decreased species richness when Enteromorpha is dominant, but increased species richness when Enteromorpha is competitively inferior. e. Periwinkles increased species richness when Enteromorpha is dominant, but decreased species richness when Enteromorpha is competitively inferior.
Fish can exhibit behaviors that are directed to
a. members of the same species. b. members of different species. c. nonliving constituents of the environment. d. all of these choices.
The human immunodeficiency virus (HIV) is an example of a retrovirus. In order to prevent incorporation of the viral DNA into the host genome, antiretroviral drugs could
A) inhibit the viral reverse transcriptase. B) inhibit retro-RNA polymerase. C) inhibit polyadenine removal. D) inhibit the viral reverse transcriptase and polyadenine removal. E) None of these are good antiretroviral strategies.