Which vascular tissue is responsible for conducting water and dissolved minerals in plants?
a. phloem
b. xylem
c. stems
d. roots
e. sori
b
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Repair of an apurinic or apyrimidinic site in DNA by AP endonuclease must be completed by the action of
A. DNA polymerase I. B. RecA protein. C. UvrABC endonuclease. D. None of the choices are correct.
Which of the following statements applies to sexually reproducing species but not asexually reproducing species?
A. Reproduction can occur with either one or two parents. B. The two "daughter" cells that result from cell division following mitosis are genetically identical to each other and to the original "parent" cell. C. Two kinds of cell division are required. D. Offspring are able to reproduce.
A confused frog deposits its sperm onto a toad's eggs as they are being laid. No offspring develop because the frog's sperm are unable to penetrate the toad's egg. This is an example of
A. gametic isolation. B. behavioral isolation. C. mechanical isolation. D. habitat isolation. E. temporal isolation.
If the chromosome number were not halved when gametes are produced, what would be the result of fertilization?
A) The zygote would undergo meiosis again to halve the number of chromosomes. B) The zygote would have double the number of chromosomes as the parents. C) They zygote would have the same number of chromosomes as the parents. D) The zygote would have half the number of chromosomes as the parents.