Your friend tells you that as long as you can track the exact day that a woman ovulates, and as long as a woman does not have sexual intercourse on this day, then she will not get pregnant even if no form of contraception is used. Is your friend correct?
Why or why not?
A) Yes. Sperm can only fertilize an egg on the day that ovulation occurs, so as long as sexual intercourse does not occur on this day, the woman will not become pregnant.
B) Yes. High levels of FSH and LH are needed for fertilization to occur, and the levels of FSH and LH do not rise until the exact day that ovulation occurs.
C) No. Even after ovulation occurs, a woman's egg remains in the uterus for at least a week and is able to be fertilized by sperm during this time period.
D) No. Sperm can survive in the female reproductive tract, so having sexual intercourse a few days before ovulation can result in pregnancy.
Answer: D
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A) repulsion. B) hydrogenation. C) dehydrogenation. D) resonance stabilization. E) all of the above
An experimental test of the hypothesis to explain the origin of the first organic compounds on Earth might include all of the following sequential steps except
A. assembling an atmosphere with H2, CH4, NH3, and H2S. B. placing this atmosphere over liquid water. C. inoculating with a few bacteria to get the process started. D. increasing the temperature of the gases. E. providing energy with electrical spark discharges.
A hybrid zone is defined as an area where two populations may breed and produce ____
a. inviable, sterile offspring b. viable host races c. inviable hybrid subspecies d. viable, fertile offspring e. viable, sterile offspring
For the lac operon in E. coli, under conditions in which glucose is absent and lactose is present, which of the following is true?
a. CRP and cAMP together are bound to the DNA, and LacI is bound to the operator site. b. The lac operon is not transcribed because lactose is present. c. CRP and cAMP together are bound to the DNA, and allolactose is bound to LacI. d. The lac operon is not transcribed due to catabolite repression because glucose is absent.