Bacteria protect their own DNA from restriction enzyme damage by adding ________ groups to certain nucleotides
A) methyl
B) hydroxyl
C) phosphate
D) amino
E) carboxyl
A
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If modern humans came from Africa, what explains the loss of pigmentation seen in different races?
A. Since there was less sunlight, darker pigmentation wasn't needed. B. The lighter-pigmented humans are found in colder climates, where having less pigmentation preserves heat. C. The diet found in the areas where lighterpigmented humans are found contain compounds that interfere with the production of pigmentation. D. Lighter pigment allows for more efficient production of vitamin D, an advantage in areas with less sunlight. E. None of the answer options is correct.
The graph below shows the rate of transport for each substance when the cells are placed in 0.10 mM solutions of A, B, and C. Based on these data and coupled with the data observed above, substance C is transported via ________.
A) active transport
B) facilitated transport
C) passive transport
D) simple diffusion
E) choices A, B, and C
Briefly define a biogenous ooze and describe two types
What will be an ideal response?
Pollination begins when pollen is transferred from the ________ to the ________ of a flower.
A. anther, ovary B. anther, stigma C. anther, receptacle D. synergid, egg E. stigma, embryo sac