A woman was told by her doctor that while she is pregnant, she might want to let someone else care for her cats so she would not contract toxoplasmosis. What is the mechanism of transmission of toxoplasmosis?
A. infection from mice the cat may bring into the house
B. exposure to infected cat feces
C. infection from saliva
D. scratches from infected claws
E. flea bites transmit the organism
B. exposure to infected cat feces
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Which of the following best describes the way in which you would use restriction enzymes as you engineered bacterial cells to produce human proteins?
A. The same restriction enzyme would be used to cut both the donor DNA and the vector DNA. B. One restriction enzyme would be used to cut the donor DNA and a different one would be used to cleave the vector DNA. C. One restriction enzyme would be used to probe the protein-coding region and another would be used to cleave that region from the larger DNA molecule. D. Restriction enzymes would be used only to cleave the vector DNA. E. Restriction enzymes would be used only to cleave the donor DNA.
Fragile X syndrome is caused by a(n)
A) deletion. B) translocation. C) expanding triplet repeat. D) point mutation.
Which of the following plant hormones was studied in the 1880s by Charles and Francis Darwin in experiments on phototropism?
A. abscisic acid B. ethylene C. cytokinin D. auxin E. gibberellin
Which of the following is part of the mitotic spindle?
A. sister chromatid B. centromere C. nucleolus D. aster E. nuclear membrane