A nucleotide may consist of
(a) deoxyribose or ribose.
(b) purines or pyrimidines.
(c) phosphate groups.
(d) all of the above.
(d) all of the above.
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The cells produced by mitotic divisions are considered to be ____
a. genetically identical b. genetically different c. clones d. similar but not exactly the same e. both genetically identical and clones
A diaphragm is a shallow, dome-shaped rubber disk with a flexible rim that fits within the vagina and covers the cervix. If it is used without a spermicide, how will it act as a contraceptive to prevent pregnancy?
A. It would prevent sperm from reaching the egg. B. It would prevent ovulation. C. It would cause the embryo to die. D. It would prevent implantation on the uterine wall. E. It would kill the sperm.
Consumption overpopulation occurs when each individual in a population consumes too large a share of resources. Indicate whether the statement is true or false
The exact elevation at which the treeline occurs depends on the ____ and ____
a. temperature; distance from the sun b. altitude; distance from the sun c. elevation; annual precipitation d. latitude; distance from the ocean e. longitude; distance from the equator