If a DNA strand is 48% A-T pairs, what temperature will cause the DNA strand to seperate? %G-C = 100 –48 = 52

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

Why does it matter if osmosis is put into a “scab” or a “nosebleed? ” where would that leave him?

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.