________ is a mechanism in the body that continually senses the internal and external environment and makes adjustments to maintain homeostasis.
A. Homeostasis
B. A negative feedback loop
C. A positive feedback loop
D. Metabolism
Answer: B
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A hypothetical genetic disease causes the body to produce antibodies that compete with acetylcholine for receptors on the motor end plate. Patients with this disease exhibit varying degrees of muscle weakness in the affected muscles. If you could administer a drug that inhibits acetylcholinesterase or a drug that blocks acetylcholine, which one would you use to alleviate these symptoms?
The process of allowing substances into and out of the cell is controlled by the ________.
A. nucleus B. cell membrane C. lysosomes D. Golgi apparatus
Male infertility (sterility) refers to ________.
A. the inability to have an erection B. a lack of seminal fluid during ejaculation C. the inability to fertilize an egg D. low sperm count E. low levels of testosterone
What is the defining characteristic of an allosteric protein?
A. They contain two polypeptide chains, with each being an exact mirror image of the other. B. They contain only one ligand-binding site, but because the specificity is low, many different ligands can bind to it. C. They contain two ligand-binding sites, one that activates the protein when a ligand binds, and the other that inactivates the protein when the same ligand binds. D. They contain more than one ligand-binding site, and noncovalent binding of a ligand to one site alters the shape of other ligand-binding sites. E. They contain no binding sites of their own, but act by modulating the activity of other proteins.