The origin of the mitochondrion and chloroplast is hypothesized to have involved
A. the absorption of RNA from prokaryotic cells.
B. prokaryotic cells that became internal symbionts within an early eukaryotic cell.
C. the fusion of two archean cells to form an early eukaryote.
D. the uptake of free DNA from the environment.
E. prokaryotic cells being engulfed and becoming external symbionts within an early bacteria cell.
Answer: B
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Adult stem cells are usually
A. differentiated. B. totipotent. C. pluripotent. D. multipotent.
The spinifex hopping mouse that is very different from other mice as it is adapted to the extreme desert environment. What will happen to this mouse if no water is available at all?
A. Like any creature, it will die without water. B. Unlike the devastating effects that water deprivation would have for almost any other species, nothing will happen to the spinifex hopping mouse, as it obtains sufficient water from its metabolic activities. C. Unlike the devastating effects that water deprivation would have for almost any other species, nothing will happen to the spinifex hopping mouse, as it obtains sufficient water from its biochemical activities. D. Unlike the devastating effects that water deprivation would have for almost any other species, nothing will happen to the spinifex hopping mouse, as it obtains sufficient water from recovered water. E. Unlike the devastating effects that water deprivation would have for almost any other species, nothing will happen to the spinifex hopping mouse, as it obtains sufficient water from its salt glands.
Which statement is true for a population with an age structure diagram in the shape of a pyramid?
a. It is a rapidly growing population. b. It means the population is mostly older individuals. c. It would be associated with a developed country. d. It would be indicative of the United States. e. It means the death and birth rates are equal.
The role of maternal effect genes in Drosophila is to:
a. code for the production of yolk proteins. b. prepare the female fly for reproduction. c. control the early stages of Drosophila development. d. control the development of the pupa. e. control the shape and size of the eggs produced.