During the process of cell division, it is necessary to make a duplicate copy of DNA for any new cells produced. First, the template strand of DNA is unwound by breaking the hydrogen bonds between the complementary strands. Next an RNA primer acts as an anchor for the new DNA strand to form. Last, matching nucleotides are connected to the growing DNA chain and gaps between DNA fragments are sealed together. All of these complex processes require enzymes in order to progress. All of the following enzymes are necessary for successful DNA replication EXCEPT
A. Helicase
B. DNA Polymerase
C. Ligase
D. RNA Polymerase

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.

Which of the following structures is not found in both plant and animal cells? a) chloroplast b) cytoskeleton c) ribosomes d) mitochondria

Autotrophs a.consume their food to get energy b.may use photosynthesis to gain energy c.are also called consumers d.cannot use solar energy