If a foreign gene is cloned into a host, it is important that the cloned host itself not produce the protein being studied. produce signal proteins to tag the host protein. produce the protein in larger amounts than the vector. repress the genetic expression being studied.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?