In order for allopatric speciation to occur, first there must be a geographic separation of two populations of the same species. The second step requires:
A) an increase in gene flow between the populations.
B) additional extrinsic isolating mechanisms to become involved.
C) physical and behavioral changes that keep them from interbreeding.
D) physical and behavioral changes that permit occasional hybridization.
Answer: C
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A) lambda B) M13 C) Mu D) T7
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If a thylakoid is placed in a basic solution, ATP synthesis will occur. How is this possible?
A. The carbon reactions are blocked in the thylakoid at high pH. B. A proton gradient is created by the difference in pH. C. ATP cannot be broken down at low pH. D. An electron gradient is created by the difference in pH. E. ATP is formed spontaneously at low pH.
A disorder that has varying levels of severity is an example of ________.
Fill in the blank(s) with the appropriate word(s).