Movement of new individuals into a population can result in
A. speciation.
B. isolation.
C. gene flow.
D. polyploidy.
C. gene flow.
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Why are there several structurally different pigments in the reaction centers of photosystems?
A) Excited electrons must pass through several pigments before they can be transferred to electron acceptors of the electron transport chain. B) This arrangement enables the plant to absorb light energy of a variety of wavelengths. C) They enable the plant to absorb more photons from light energy, all of which are at the same wavelength. D) They enable the reaction center to excite electrons to a higher energy level.
Some genes, such as the human ABO blood groups, have more than two alleles. For these genes:
a. a greater proportion of the individuals must be heterozygous than homozygous. b. some individuals can be triply heterozygous. c. normal dominance relationships are not possible. d. individuals can only possess two alleles. e. All of the above are correct
How is the chemiosmotic process shown in the figure similar to secondary active transport (cotransport) of solutes (discussed in Chapter 3)?
a. Both processes are powered by an electron transport chain, which transports ions across a membrane.
b. Both processes use an electrochemical gradient to store energy.
c. Both processes result in the synthesis of ATP.
d. Both processes typically involve H+ (proton) gradients.
Bacterial protein synthesis can begin before the reading of the gene is complete.
Answer the following statement true (T) or false (F)