Walter is comparing samples of muscle tissue that are taken from the body of a
mouse. Which pair of sample muscle tissues can be expected to be most similar
to each other?
a. tissue from the heart muscle, and tissue from a neck muscle
b. tissue from a muscle that lines the small intestine, and tissue from the heart
muscle
c. tissue from a muscle that lines the stomach, and tissue from a muscle in the
front leg
d. tissue from a muscle in the rear leg, and tissue from a muscle in the neck

Salmonella typhimurium is a food-borne bacterial pathogen that can cause severe gastrointestinal disease. salmonella is often phagocytosed by macrophages that normally destroy bacterial pathogens, but this bacterium is somehow able to prevent the complete maturation of phagolysosomes. salmonella is able to tolerate the low ph of phagolysosomes, and in fact responds to the drop in ph by secreting toxins that interfere with other cellular responses. which of the following differences would you expect to contribute to the survival of a bacterium within an salmonella-containing phagosome, compared to a healthy phagolysosome? decreased activity of acid hydrolases increased activity of acid hydrolases decreased import of h+ ions increased import of h+ ions my guess is decreased activity of acid hydrolases but i'm not sure.

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.