Natural gas can be burned directly or separated into methane and other gases, including propane, butane, and ethane. Which of the following is true of these component gases when compared to unrefined natural gas?
s
1. They have a lower heat value when burned.
II. Their purification results in less net air pollution.
III. They are more efficient for certain specific purposes.
Your
O l only
O III only
I and II only
O I and III only
on
I, II, and III

Are substances released into the environment that in excess amounts cause damage

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.

The instructions for making proteins come originally from