The answer should be RNA but i think DNA would work too
Answer:
Option A
Explanation:
The concentration of salt is lesser than the concentration of salts in the solution. The membrane of the cell is permeable and hence it shall allow movement of salt ions towards the region of lower concentration from the region of higher concentration in lieu to the concentration gradient formed (supported by differences in concentration of salt within and outside the cell). Like the movement of salt, the water shall also move from region of high concentration to region of low concentration and thus water will move out of the cell thereby shrinking it.
Hence, option A is correct
Answer:True
Explanation:
Nerve impulse must reach a certain threshold in a neuron before action potential can be generated to intiate conduction of action potential.
Therefore if mutiple impulses are generated and these are not upto thresholds , no matter how strong the stimulI are-NO ACTION POTENTIAL WILL BE GENERATED.
THIS IS ALL OR NONE PRINCIPLE
The all or none hypotheses can be best explain with flushing of the water closet after using it. If required volume of water is not pumped into the water closet storage above, no matter how long the handle is push, FLUSHING WILL NOT TAKE PLACE.Thus the threshold volume of water must be met.
Urea is the cellular waste product that the kidneys remove from the blood.Kidneys are the two bean shaped organs that has several functions to keep the body healthy. It not only removes urea from the blood, but also helps in the formation of urine and maintaining the fluid level of the body. The two kidneys are placed on the two sides of the spinal cord. The blood enters the kidney through the renal artery. The nephron within the kidneys mainly take out the waste products and the excess water from the blood and purifies it.If the kidneys of a person fail to work properly then it becomes important to perform dialysis for taking out the waste materials from the blood.