In the section "Investigating Life: Birds Do, Bees Do It", the experiment supports that a change in just one gene locus may have jump-started speciation in Mimulus. This is an example of
A. pre-zygotic barriers to reproduction.
B. post-zygotic barriers to reproduction.
C. gradualism.
D. punctuated equilibrium.
E. asexual reproduction.
D. punctuated equilibrium.
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The purpose(s) of two circuits in a closed circulatory system is to ____
a. collect and distribute blood within the heart b. take blood to and from all parts of the body c. take blood to and from the lungs d. keep oxygenated and deoxygenated blood separate e. allow oxygenated and deoxygenated blood to mix
what does the T cytotoxic cell (CTL) do?
What will be an ideal response?
In a cyanobacterium, the reactions that produce NADPH occur in
A) the light reactions alone. B) the Calvin cycle alone. C) both the light reactions and the Calvin cycle. D) neither the light reactions nor the Calvin cycle. E) the chloroplast, but is not part of photosynthesis.
The vegetative stage of a protozoan is called a (cyst/trophozoite/zygote)
What will be an ideal response?