Certain nutrients are considered "essential" in the diets of some animals because _____
A) only those animals use those nutrients
B) these animals are not able to synthesize these nutrients
C) the nutrients are necessary coenzymes
D) only certain foods contain them
B
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People affected by diseases caused by mtDNA defects
A) typically have cells that are heteroplasmons. B) show partial penetrance. C) are sterile. D) inherited them through maternal effect. E) have epistatic respiration.
Fertilization is completed when the sperm nucleus fuses with the ________
Fill in the blank(s) with correct word
The earliest hominin discovered to date, in a dry lake bed in Chad, belongs to which genus?
a. Homo b. Ardipithecus c. Sahelanthropus d. Australopithecus e. Aegyptopithecus
Why have legumes been planted as a cover crop to improve the soil fertility of a field?
A) Legumes have nitrogen-fixing bacteria in their root nodules. B) The leaves of legumes absorb more nitrogen than other plants. C) Legumes have carbon-fixing bacteria in their root nodules. D) Legumes aid organic decomposition. E) Legumes need about 100 times less nitrogen than other plants.