If over several generations a trait does not vary in a group of organisms, that group can be called a _______
A. dihybrid
B. hybrid
C. true-breeding line
D. variant
E. cross-fertilized line
C
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Since the beginning of the twentieth century, the rate at which ________ and other so-called greenhouse gases have entered the atmosphere has been faster than at any other time in the known history of life on Earth.
Fill in the blank(s) with the appropriate word(s).
Which statement correctly describes archaeal cell walls?
A. Many have peptidoglycan. B. Some have an outer layer of complex polysaccharide. C. Some have an outer layer of protein. D. Some have an outer layer of complex polysaccharide and some have an outer layer of protein.
In the United States, most thyroid disorders are
caused by
a. iodine deficiency. b. iron deficiency. c. an autoimmune disorder. d. insecticides. e. a combination of more than one of these
In the experiment in which Frye and Edidin fused the plasma membranes of a mouse and a human cell,
what happened to the membrane proteins? a. They formed a spherical structure. b. They formed a bilayer. c. They moved laterally across the cell surface. d. They flip-flopped from one layer to the other. e. They reacted with cholesterol molecules on the membrane surface.