The short arm of a chromosome is denoted by the letter _______ and the long arm by the letter _______
A. p, q
B. s, l
C. q, p
D. c, d
A
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Why don't steroid hormones bind to transmembrane cell-surface receptors?
A. Steroid hormones don't require receptors because they bind directly to the cell's DNA. B. Steroid hormones are not signaling molecules. C. Steroid hormones are nonpolar and therefore cannot bind to receptors. D. Steroid hormones are nonpolar and cross the cell's plasma membrane, binding to receptors inside the cell.
The heating and cooling system in your house or apartment can be thought of as a homeostatic system. You set the thermostat to 70 degrees Fahrenheit, and the air conditioner turns on and starts cooling the room. The air conditioner can be thought of as the _____ of the system.
A. set point B. sensor C. effector D. homeostat E. regulatory response
The trp operon is ____ unless tryptophan is ____
a. turned on; available in the environment b. turned on; bound to the operator c. turned off; bound to the repressor d. turned off; bound to the promoter e. turned on; synthesized by the trp repressor gene
Which structures lining the tissue surface of the respiratory tract can be damaged by airborne particles?
A) cilia B) alveoli C) bronchi D) capillaries