The evolution of membrane-bound organelles and thus compartmentalization within eukaryotic cells likely arose due to all of the following except ________.
A. the need to increase the overall amount of cell membrane to maximize efficiency of transport systems
B. the need to increase surface area to maximize those processes that take place in a membrane, such as oxidative phosphorylation
C. the need to spatially separate simultaneous processes in order to ensure independent control
D. the need to prevent mixing of cellular macromolecules such as proteins and polysaccharides
Answer: D
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An individual travels from one geographic location to another and joins a different population of the same species, introducing a new allele for a characteristic that wasn’t there before that individual’s arrival. This is an example of _______.
a. gene flow b. genetic drift c. mutation d. natural selection
Bilateral symmetry is characteristic of a(n) ____
a. cnidarian b. roundworm c. echinoderm d. corals e. flatworm
The ultimate source of all energy in a terrestrial ecosystem is
a. the organic matter in all the organisms of the ecosystem. b. water. c. sunlight. d. carbon dioxide. e. ATP.
Which statement about an F factor is FALSE?
a. It is a DNA sequence. b. It is found in F+ cells. c. The F stands for fertility. d. It is involved with forming sex pili. e. It is found in recipient cells, not donor cells.