A purpose of the plasma membrane is to:
A) produce proteins.
B) keep harmful substances within the cell.
C) form the outer boundary of a cell.
D) form ribosomes.
E) allow no contact with other cells.
Answer: C
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What functional group is not present in the following structure for thyroxine (thyroid hormone)?
a. carboxylic acid b. organic halide c. amine d. all of the above
The value for ? in root tissue was found to be -0.15 MPa. If you take the root tissue and place it in a 0.1 M solution of sucrose (? = -0.23 MPa), the net water flow would _____
A) be from the tissue into the sucrose solution B) be from the sucrose solution into the tissue C) be in both directions and the concentration of water would remain equal D) occur only as ATP was hydrolyzed in the tissue E) be impossible to determine from the values given here
When the atria contract, where does the blood move next?
a. to the brain b. to the body c. the ventricles d. to the lungs
A 67-year-old man, who is an avid gardener, presents at an emergency department. He is suffering from spastic paralysis, which began in his right hand and now extends to his jaw muscles (Lock Jaw). The causative agent of this infection produces a virulence factor with which of the following activities?
A. Blockage of the release of the inhibitory neurotransmitter glycine. B. Blockage of the release of the neurotransmitter acetylcholine from synaptic vesicles. C. Overstimulation of T cells with resulting massive release of cytokines. D. Inhibition of Elongation Factor 2 (EF-2), resulting in inhibition of protein synthesis.