The incidence of MRSA, methicillin-resistant Staphylococcus aureus, has increased in the last twenty years. The rise of MRSA strains is significant, and MRSA infections are often developed within the hospital system rather than outside of them. In terms of how MRSA strains developed, evaluate each statement below. Choose the statements that accurately describe how MRSA strains occurred. You may select ALL that apply. A) Individuals that are admitted to the hospital are likely already carrying MRSA infections.
B) Hospitals treat patients with MRSA with drugs that cause the Staphylococcus aureus to mutate more rapidly.
C) Hospital systems provide a mechanism for extreme selection pressure with sterile technique and heavy use of antibiotics.
D) Staphylococcus aureus can transmit genetic components containing the methicillin resistance to offspring and other members of the population.
E) Staphylococcus aureus that was already genetically predisposed to be resistant to methicillin existed in small proportions of the original population.

Pepsin is an enzyme in the stomach that breaks polypeptides into amino acids. pepsin functions best at a ph of around 1.5. what would be the most likely result if the ph of the stomach were increased to 5

Read the following scenario to answer the following question. over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution

Multicellular organisms use cell division, mitosis, for growth and the maintenance and repair of cells and tissues. single-celled organisms may use cell division as their method of reproduction. regardless of the reason for mitosis, the process ensures genetic continuity. what is the step in the cell cycle that ensure genetic continuity?