How are individual atoms of oxygen formed in the stratosphere? a. individual oxygen atoms are formed when oxygen molecules collide with each other. b. individual oxygen atoms are formed in the sun. c. individual oxygen atoms are formed during photosynthesis. d. individual oxygen atoms are formed when uv rays strike oxygen molecules.

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.

What feature of cell theory is best demonstrated in the image

Models are non-visual ways of coummincating how someone thinks about something in the natural world