Which of the following organisms is commonly associated with biofilm formation in hospital settings?
a. bacillus cereus
b. micrococcus lutes
c. pseudomonas aeruginosa
d. eschericia coli
Ans: c. pseudomonas aeruginosa
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Who is usually credited with the discovery of penicillin?
A. Ehrlich B. Florey and Chain C. Fleming D. Duchesne
Altruistic behavior ____
a. works in a similar way to selfish herds b. is sexually directed behavior c. is self-sacrificing behavior d. is aggressive behavior e. is nonreactive, such as freezing at the sign of danger
For anaphase to begin, which of the following must occur?
A) Chromatids must lose their kinetochores. B) Cohesin must attach the sister chromatids to each other. C) Cohesin must be cleaved enzymatically. D) Kinetochores must attach to the metaphase plate. E) Spindle microtubules must begin to depolymerize.
Which of the following are true regarding meiosis in human females versus males?
a. All of these options are true b. Over the course of a lifetime, a XY male will produce many more gametes than a XX female c. Mutation rates during DNA replication before meiosis increase with age in XY males d. Meiosis is arrested in one sex but not the other e. Meiosis starts during embryonic development in XX females f. Meiosis begins at puberty in XY males