Answer:
Explanation:
An ecological community can be described as all the different species of organisms i.e all the different plants and animals, living in a particular habitat at a specified time. An ecological community will consist of: Predators: Organisms which feed on other organisms.
When lactose is not present, what happens to E. coli is that the genes that produce the enzymes needed to break down lactose are not expressed. The correct answer is B.
Answer: Option A.
participate in innate immunity
secrete granzymes and perforin
Explanation:
Cytotoxic T (TC) cells are like natural killer (NK) cells because they both because participate in innate immunity they are components of innate immune system i.e white blood cells that fight against disease or act as defence for infections.
NK cells can recognize and destroy cells that have regulated MHC class I molecules from their cell surface. They recognise the viral pathogens and activate the receptor that bind to the target cell and it releases cytotoxic granules that contain perforin and granzymes, which leads to lysis of the target cell and then it's clear off the infection by producing antibodies.
Expository writing is explaining things in clear, logical steps, whereas narrative writing is telling a story, either fiction for enjoyment or an educational or exemplary story for an essay.
