In populations, adaptation usually arises through
a. natural selection.
b. heredity.
c. development.
d. metabolism.
e. responsiveness.
A
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You find a sick plant in an arid environment. After studying it, you believe it is specifically defective in C4 photosynthesis. What nutrient might this plant be lacking?
A. Copper B. Nickel C. Molybdenum D. Sulfur E. Sodium
If four genes are in the same region of a eukaryotic chromosome, then
A) the four promoters must be oriented such that two genes are transcribed using the Watson strand as a template and two genes use the Crick strand. B) the four promoters must be oriented such that all four genes are transcribed using the same strand as the template. C) the four promoters may be oriented such that some of the genes are transcribed using the Watson strand as template, and others use the Crick strand. D) the genes can be transcribed from different strands only if their promoters are more than 1 kilobase apart. E) the genes must be in a gene family.
Which particle is able to freely cross the plasma membrane?
a. Na+ b. Clc. oxygen d. glucose e. amino acids
The sodium-potassium pump transports two Na+ out of the cell for every two K+ transported in
____________________ Indicate whether the statement is true or false.