The diversity of proteins in humans is primarily a result of: a) the existence of 5' caps and 3' poly-a tails. b) the large size differences in mrna transcripts. c) exon variability in mature mrna. d) the vast number of genes compared to other eukaryotic organisms. polycistronic mrnas.

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.

About how much of the cell mass is watet

20 the main source of energy for our planet comes from the