When penicillin was introduced, how long did it take for penicillin-resistant strains of bacteria to emerge?

A. 25 years
B. 4 years
C. 6 months
D. 1 year
E. 10 years


Answer: B

Biology & Microbiology

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Answer the question using the accompanying figure. Label B illustrates Plasmodium infection of the ____

a. kidney b. liver c. gall bladder d. stomach e. lung

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Below is a pedigree of a human genetic disease in which solid color indicates affected individuals. Assume that the disease is caused by a gene that can have the alleles A or a. If individuals 2 and 3 have a child together, what is the probability that the child will exhibit the disease?



A) 0%
B) 25%
C) 50%
D) 75%
E) 100%

Biology & Microbiology

Mast cells

a. are anchored in tissue. b. secrete substances contained within their granules. c. will respond to injury or antigen. d. may respond to chemical signals from the nervous system. e. fit all of these characteristics

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The monomer of tubulin:

a. Has 3 subunits in it b. Is a monomer with a molecular weight of 42 kDa c. Is a dimer with a molecular weight of 220 kDa d. Is a heterodimer with a total molecular weight of 110 kDa e. None of the above

Biology & Microbiology