<span>True, Each joule of work is one newton-meter of energy.</span>
Diffusion is important to organisms because it is the process by which useful molecules enter the body cellsand waste products are removed. Digested food molecules (amino acids, glucose) move down a concentration gradient from the intestine to the blood.
Cumulus clouds are a bunch of low-lying clouds and they look like cauliflower. They are fair weather clouds. And therefore, on seeing them, I would continue lying on the beach. So, your answer is A. Cumulus clouds are puffy and are not sign of bad weather unless they are higher in the atmosphere.
The parasympathetic nervous system responds when the body is relaxed and at rest while sympathetic nervous system is responsible for response to emergency situation.
Explanation:
- The sympathetic nervous system is called fight or flight division while the parasympathetic nervous system is the rest and digest division.
- The pre-ganglionic neurons of sympathetic nervous system arises from lumbar and thoracic regions of spinal chord while the preganglionic neurons of parasympathetic nervous system arises from the brain and sacral region of the spinal cord.
- The sympathetic nervous system decreases the activity of digestive system while the parasympathetic nervous system increases the activity of digestive system.
- Sympathetic nervous system dilates bronchioles while parasympathetic nervous system constricts bronchioles.
- Sympathetic nervous system increases blood pressure while parasympathetic nervous system usually do not effect blood pressure.
- Sympathetic nervous system increases heart rate while parasympathetic nervous system decreases heart rate.
Answer:
a mutation that blocks the GTPase activity of Ras
Explanation:
A G protein in inactive state is GDP bound but as soon as a guanine exchange factor (GEF) exchanges it with GTP it gets activated which means that in GTP bound state it is active. G - protein has endogenous GTPase activity. Upon interaction of GAP, the GTPase activity of this protein is exhibited. When GAP is present, hydrolysis of GTP into GDP occurs which leads to inactivation of G protein. A mutation which will block GTPase activity of Ras will therefore result in constitutive active signaling even in the absence of ligand binding to it's receptor. In such scenario, GTP will not be hydrolyzed into GDP so signaling will be up-regulated.
