Light travels from space to earth
a. in circle lines.
b. in straight lines.
c. in waves.
d. in circle and straight lines.
e. in circle lines and in waves
C
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Suppose that, with regard to a particular genetic locus with two alleles, A and a, we know that 60% of the alleles in the gene pool of a particular large population are A. Suppose further that we observe this population for five generations, during which we know that no mutation, selection, or migration has occurred. After this period, the frequency of the a allele is expected to be _____.
A) 0.6 B) 0.4 C) 0.25 D) 0.16 E) 0.5
If an animal cell suddenly lost the ability to produce GTP, what might happen to its signaling system?
A) It would not be able to activate and inactivate the G protein on the cytoplasmic side of the plasma membrane. B) It would be able to carry out reception and transduction but would not be able to respond to a signal. C) It would use ATP instead of GTP to activate and inactivate the G protein on the cytoplasmic side of the plasma membrane. D) It would employ a transduction pathway directly from an external messenger.
Sexual reproduction produces individuals that are always genetically identical to the parents
Indicate whether the statement is true or false
Which of the following must occur in order to maintain a high pressure potential within guard cells?
A. Stomata must take up more oxygen and less carbon dioxide. B. Energy must be constantly expended. C. Water must exit guard cells by osmosis. D. Potassium ions must be actively transported out. E. The rate of transpiration must increase.