Fifty-million sperm were examined for mutations in a specific gene and 100 mutations were found. What was the mutation rate for this gene?
A) 5 × 10?6
B) 50 × 10?6
C) 2 × 10?6
D) 2 × 10?5
E) 5 × 10?5
C) 2 × 10?6
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If the thymus fails to develop,
A. functional T cells are absent. B. functional B cells are absent. C. Di George's syndrome exists. D. complement deficiencies exist. E. functional T cells are absent AND Di George's syndrome exists.
Rats
a. are carriers of human pathogens. b. spread bubonic plague via infected fleas. c. infest rice fields, significantly reducing the yield. d. cause billions of dollars of annual economic loss. e. do all of these.
What activity is likely to cause the intermediate filaments that make up the nuclear lamina to reassemble after mitosis has ended?
a) acetylation b) methylation c) phosphorylation d) dephosphorylation
Which antimicrobic does not inhibit cell wall synthesis?
A) Gentamicin B) Clavamox C) Penicillins D) Cephalosporins E) Vancomycin