An Hfr cell and an F? cell result from conjugation between a donor cell and a recipient cell. Which statement is false regarding this event?
A. The donor could not have been F?.
B. The donor could have been either F? or F+.
C. The recipient could have been F?.
D. The donor could have been Hfr.
Answer: B
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Which of the following is not a cost of sexual reproduction?
A. Sexually reproducing species must produce male and female sex organs B. Sexually reproducing species must find and attract mates. C. Sexually transmitted diseases. D. Each child only inherits on half of the mothers genes, instead of all of them. E. Males cannot give birth.
Which of the following is the most difficult to inactivate?
A) enveloped viruses B) fungus spores C) bacterial endospores D) nonenveloped viruses E) protozoan cysts
A mutation is ___________.
A. a temporary and reversible alteration in a DNA molecule B. a mistake that can occur in either transcription or translation C. a change in the nucleotide sequence of DNA D. blockage of the ribosome-binding sites
The female hormones that participate in milk
production for and delivery to the newborn are a. prolactin and oxytocin. b. prolactin and estrogen. c. prolactin and progesterone. d. oxytocin and estrogen. e. oxytocin and progesterone.