D: elodea plants without snails
The answer is a tumor.
Tumors are characterized by cells that have a mutation in their DNA that causes them to reproduce unregulated hence proliferate and do not form true tissues. Inhibitors, called tumor suppressors, act like a ‘brake’ in the cell cycle. Cyclins, on the other hand, are the ‘gas pedal’ for the cycle. The right balance ensures that cell cycle is well regulated. When the DNA is a cell is damaged, the tumor suppressors are rectruited to stop any further progress of the cell cycle and the cell undergoes apoptosis.
Answer:d Option C.
Bundles of axons that share common origins, destinations and functions.
Explanation:
White matter is an important component of the spinal cord and brain that form the nervous system. It is composed of myelinated axons and they connect grey matter of the brain to each other and also carry nerve impulses or signals to the neurons. The white matter has myelin, a fatty substance that surrond the axon and this is provide electrical insulation.
Answer:
A. Renin levels increase with poor kidney perfusion
D. Nephrotoxic drugs are a cause of intrarenal failure.
Explanation:
Renin is produced in the kidney for angiotensin aldosterone hormonal system and it is helpful in maintaining the blood pressure and other metabolic activities. However when the renin level is high then it means the kidney has a perfusion issue .
Nephrons are kidney cells. When a drug which is toxic to them gets into the body system then it affects the kidney and may cause kidney failure.
Cell specialization is important because
-it is required for cells to perform as part of a living thing
-different cells need to do different things
