The tuberculin response is mediated by
A. memory T cells.
B. mast cells.
C. B lymphocytes.
D. plasma cells.
E. eosinophils.
Answer: A
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Lethal mutations can be recovered in haploid organisms if they are
A. active. B. conditional. C. dominant. D. None of the choices are correct.
Bacterial cystitis
A. is a common nosocomial disease. B. is typically caused by Escherichia coli. C. may occur through the use of a catheter. D. is unusual in men under 50. E. All of the choices are correct.
Squirrels in cities are accustomed to humans and will continue to forage in their presence. What term best describes this behavior?
a. learned behavior b. imprinting c. desensitization d. habituation e. habit formation
The plant hormone that inhibits seed germination is:
a. abscisic acid b. auxin c. gibberellin d. ethylene e. systemin