The answer is graded potential<span>. Its made of various action potentials that depolarise the neuron incrementaly, in short interspersed intervals that do not give time for the neurons to return to resting potential. Therefore, the actions potentials, of varying sizes, grade up in sum and when they cumulatively reach the threshold level, they invoke an impulse in the nerve</span>
Anemia- The Bone Marrow stops making red and white cells and platelets for the body.
People with severe or very severe are in risk of life threathing infections and bleeding.
Leukemia- Is a cancer to blood or bone marrow .Large numbers of white cells are produced in the bone marrow and crowd it and the bloodstream and they cannot perform the proper role of protecting and fitting against diseases.Blood has to go everywhere to bring to body what it needs, making it a stuff cancer.
Major progress and been made targeting this cancer, take the blood out of the body, separate your cancer blood from your good blood, better ways to kill only the bad blood, make more good blood faster, relax your body, mind, improved immune system.
this is true. when it is warmer the plant and insects can migrate to these other places so they do not have to die or hibernate through winter
Answer:
The correct answer is: d. REs activity is best preserved by freezing the RE and thawing it out for brief periods of time as needed.
Explanation:
- Restriction enzymes can be defined as endonucleases that can recognize specific nucleotide sequence in a DNA (Deoxyribonucleic acid) sequence and cause breakage of phosphodiester bond in the DNA at the target site. Hence, it has the capacity of cleaving a DNA sequence.
- These are made up of proteins which are required to be present in the accurately folded conformation in order to function.
- Any form of alteration in the three-dimensional structure of the protein induced due to physical, chemical, mechanical or physiological factors can cause denaturation of the protein which in turn can render the protein non-functional.
- Freezing of restriction enzymes (REs) directly without the use of glycerol will cause the movement of water molecules within the proteins as well layering of water molecules on the protein surface.
- At low temperature these water molecules change to ice crystals which can alter the conformation of the protein or can cause breakage of peptide bonds in the proteins by physical force.
- This can cause the protein to get denatured and hence non-functional.
- Hence, it is never advisable to preserve REs by freezing directly without glycerol.
- Glycerol forms a layer around the protein molecules and prevents the protein molecules from coming into direct contact with the water molecules and hence prevents protein denaturation.
