In oxidative phosphorylation, ATP production is coupled to the events in the electron-transport chain. What is accomplished in the final electron-transfer event in the electron-transport chain?
(a) OH– is oxidized to O2
(b) pyruvate is oxidized to CO2
(c) O2 is reduced to H2O
(d) NAD+ is reduced to NADH
(c)
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Which does NOT produce variation?
a. crossing over b. random alignment of chromosomes during meiosis c. mitosis d. genetic recombination of alleles e. sexual reproduction
Recombination analysis allows for the mapping of genes because the frequency of crossing over is proportional to what distance?
What will be an ideal response?
How do hormonal methods prevent conception?
What will be an ideal response?
Radioactive isotopes are used in dating materials from the distant past. Which of the following statements about radioactive dating techniques is true?
A. It gives the general ages of rock strata. (±1 million years). B. It uses a technique in which the degree of radioactive decay is measured, the younger the rock the more radioactive decay. C. It gives exact ages of rock strata. (± 1 year). D. It uses a technique in which the degree of radioactive decay is measured, the older the rock the more radioactive decay. E. It does not work well with fossil remains that have not absorbed radiation.