Receptors for peptide hormones lie
A. in the cytoplasm.
B. in the nucleus of the cell.
C. within the cell membrane.
D. in association with ribosomes in the cytoplasm.
Answer: C
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Tube feet of sea stars, erectile tissue of the penis in vertebrates, and the bodies of cnidarians are all supported by ____
a. an exoskeleton b. cardiac muscle c. a hydrostatic skeleton d. an endoskeleton e. joined exo- and endoskeletons
The lymphatic system returns ____ liters of fluid to the bloodstream each day
a. 1 to 2 b. 3 to 4 c. 6 to 7 d. 10 to 13 e. more than 50
________ chromatography involves separating proteins by binding them to ligands
A) Affinity B) Polyacrylamide C) Size-exclusion D) Ion-exchange E) Electrophoresis
Microspheres
A. have a boundary membrane. B. are formed from heating protein-like molecules C. contain macromolecules. D. All of these answers are correct.