Nuclear receptors that have been identified and their genes cloned, but their hormone ligands are unknown are called ________.
A. unknown ligands
B. nongenomic receptors
C. orphan receptors
D. transcription factors
Answer: C
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Activated lymphocytes must make thousands of copies of themselves in order to fight off the thousands of pathogens reproducing in the body. This reproduction of lymphocytes is called ________.
A. lymphocyte proliferation B. lymphocyte activation C. differentiation D. immunization
Hydrogen bonds are too weak to bind atoms together to form molecules, but they do hold different parts of a single large molecule in a specific three-dimensional shape
Indicate whether the statement is true or false
The form of kinetic energy that refers to the movement of electromagnetic waves is ________ energy.
Fill in the blank(s) with the appropriate word(s).
The atrioventricular valves are closed when ________
A) atrial pressure is greater than ventricular pressure B) the atria contract C) the ventricles fill with blood D) atrial pressure is less than ventricular pressure E) atrial systole occurs