Which of the following statements about rem sleep is true? question 3 options: while dreaming, eyes may dart around as if watching a dream unfold. dreams occur only in rem sleep. the diaphragm, nasal membranes, and erectile tissue cannot move during dreams because of loss of muscle tone. time spent in rem sleep decreases later in the sleep cycle. save

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 concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

If an organ has six haploid chromosomes,how many chromosomes are present. 6 12