Answer:
Virus are small infectious particles which act as intracellular parasites. They are considered non-living when they are present outside their host because they show no metabolism outside.
They do not have even cellular level of organization and are basically just packages of nucleic acid and protein. Still, virus have some important features which are common with cell-based life like the presence of nucleic acid as their genetic material.
Apart from the presence of genetic material they also have the ability to evolve like the cell-based life. This evolution allows them to be selected naturally and produce more offspring.
No, not really because if nothing is near them they cant sense any type of danger. But if something is close they may be afraid but don't sense danger. It basically a spiderman myth.
Hope I helped!
- LILBLAKEYOUT
Answer:
CDKs, or cyclin-dependent kinases, are present in the cell at a constant concentration throughout the entire cell cycle.
Explanation:
It is the concentration of cyclins that changes. When there are more cyclins in the cell, they will bind to more of the CDKs and form more cyclin-CDK complexes with do the real regulating. So if you're asking about cyclin concentration, that depends on what kind of cyclin you're dealing with because different ones are produced and broken down at different points. For example, the M cyclin helps regulate mitosis, so it is at its highest concentration during mitosis and is degraded shortly after, before being produced all over again the next time S or G2 phase rolls around.
Remember though that the CDK level stays the same; the thing that changes is the changes is the cyclins that activate it/.
