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.
<span>1) Receptors are linked with sensory neurons that send any signals that the receptors pick up to the brain. If the signal requires some kind of response to maintain homeostasis, signals travel through motor neurons to effectors.</span>
<span>2) The organ that controls the regulation of body temperature is the hypothalamus while the process that allows us to maintain our core temperature is referred as thermoregulation.</span>
3) Controlling blood sugar levels with insulin is a negative feedback mechanism. Receptors in the body sense when blood sugar levels rise. To deal with that, the pancreas pumps insulin into the blood to lower it. Blood clotting is a positive feedback mechanism where platelets start to clump around an injury in a blood vessel and release chemicals that bring more platelets that end up doing the same thing to form a clot.
Answer: Ozone in the stratosphere is made up of three (3) oxygen atoms while Oxygen we breathe consists of two (2) atoms
Explanation: Oxygen in the atmosphere is a diatomic molecule, this means it is made up of two oxygen atoms. Ozone is a blue gas with a pungent odor, it is a triatomic molecule, this means it is made up of molecules containing three oxygen atoms. Ozone protects living organisms by preventing ultraviolet rays from reaching the Earth's surface.
Answer: A. Digest fats in the stomach.
Explanation: The liver produces bile. Bile emulsifies fats, It breaks up large droplets of fats into smaller droplets, thereby increasing the surface area for lipases to work on, speeding up the digestion of fat by the lipase. Bile further neutralizes the acid produced by the stomach to provide an alkaline environment for enzymes in the small intestine.
Bile acids are important for digestion and absorption of fats and fat-soluble vitamins in the small intestine.
Answer - <span>A. Pupils of the eyes dilate in the dark.
Reasoning - To start reason why it is answer A is because of the changes in the environment. Since the changes in the environment is dark, then your eyes will begin to dilate or get bigger in the dark to capture more light.
</span>
