DNA, Gene, chromosome, nucleus, Cell
A host cell. Without a host cell, the viruses cannot survive since they don't have any chemical machinery
Answer:
the first one
Explanation:
The animals above it can no longer eat it, and the animals below it will no longer be eaten by it.
Answer:
if the Earth's gravity had four spheres it would not equal the atmosphere
Explanation:
if you want C to interact with the other spheres you have to make sure that the other spheres have the same centripetal force
Answer:
Explanation:
An allosteric enzyme is one in which the activity of the enzyme can be controlled by the biniding of a molecule to the "allosteric site". This really just means somewhere other than the active site. Thus allosteric control of an enzyme can be classed in two ways. A positive allosteric modification is the binding of a molecule to the enzyme which increase the rate of reaction. Sort of like catalysing the catalysing effect of an enzyme. Obviously the opposite is true of negative allosteric modification. A good example for this is the activity of phosphofructokinase, which is promoted by a high AMP concentration, and inhibited by a high ATP concentration. This should make sense if you think about the action of a kinase etc.
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