To a geneticist, races are populations of the same species where allele frequences differ by _________
percent to ___________ percent. Fill in the blank(s) with the appropriate word(s).
ANS: 25; 30
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Which of the following is NOT found in
fermentation?
a. NADH b. ATP c. pyruvate d. oxygen e. glucose
Explain how the movement of hydrogen and potassium ions across the membranes of guard cells opens and closes the
stomata. What will be an ideal response?
The effect of a sending neuron on a receiving neuron is typically greater when ________ neurotransmitters bind to the receiving neuron and the synapse is ________ the base of the receiving cell's axon
A) more; close to B) fewer; close to C) more; far from D) fewer; far from
Why do some leaves change color (red, yellow, orange, etc.) in the fall?
A. When leaves die, the chlorophyll molecules are no longer visible. B. Cold weather denatures the chlorophyll molecule, and it begins to reflect different colors. C. The chlorophyll molecule breaks down and other pigments now become visible. D. The chlorophyll molecule is modified to absorb different wavelengths of light.