functions in the following?

Question

what is the function of:
a transport protein
cholesterol
glycoprotein
receptor protein
glycolpid
really hard i know but i need sum serious help

Answer 1

Ok, here's a few that should help, but this is far from a complete answer, so make sure to keep plugging...

1. Transport proteins bind with molecules that need to pass through specific gated channels to get through a cellular membrane. They also can be used to protect certain molecules (like steroid hormones) while in the circulatory system.

2. Cholesterol is found in cellular membranes between the phosopholipids that make up the majority of the membrane. It is there to prevent the membrane from being too fluid when exposed to higher tempratures, and from being to stagnent when tempratures are lower. Cholesterol is also the backbone for steroid hormones like estradiol, estrogen, and testosterone.

3. Glycoprotein: I'm not sure but it sounds like a protein that has a carbohydrate attached to it, perhaps as a messenger to open a ligand gated ion channel, or to communicate with the extracellular membrane in order to signal a secondary signal within the cell.

4. A receptor protein is an extracellular protein (although it is not uncommon for the protein to also have a terminus within the cell as well) that can act as either a gate for messengers to pass through, or a signal that recieves a messenger extracellularly and activates a secondary messenger, and thus a cascade, within the cell. The postsynaptic area of a neuron is rich with receptor proteins that allow for the propogation of an action potential, and thus the creation of a neural network.

5. Glycolipid: Again, I'm just using deductive reasoning on this, but I believe a glycolipid would be a lipid, likely part of the phosopholipid bi-layer, that has a carbohydrate attached to it for the purposes of extracellular communication or perhaps signaling a secondary messenger within the cytoplasm.

Hope these answers help.

Answer 2

use www.wikipedia.org for all your information needs