Treating bacteria, like e. coli, with a cold solution of calcium chloride can make the cells more receptive to take up dna from a solution. bacterial cells prepared by this process are referred to as:

In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

The kind of fertilization found in the majority of aquatic animals is (internal or external) fertilization.

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.