How does cholesterol affect membrane fluidity? Group of answer choices a. It tends to increase the fluidity b. It has no influence on membrane fluidity c. It tends to decrease membrane fluidity

Cholesterol is a membrane component that can modulate membrane fluidity. True O False

Please answer questions 1a, b, and c please.

How are the ER and Golgi involved in membrane creation? (Think about lipid synthesis and distribution). What are the characteristics of Sphingolipid and cholesterol in the membrane? What does it do to the membrane? Explain raft formation.

Compound Sodium Lactate is isotonic solution. this mean that it  a. reduces movement of sodium across the membrane  b.prevent movement of water across the semi permerable cell membrane  c. promotes movement of water out of the cell d. facilitates equal movement of water across the semi permerable cell membrane

Predict the fate of a red blood cell placed in each of the solutions below. Explain why these changes would take place. (Calculate osmolarity for each solution). Take into account that some will ionize and some will not. 0.3 M Glucose 0.3 M NaCl 0.15 M NaCl

In an experiment, a 0.001 (mole fraction) solution of polysaccharide in water is made and is placed in the compartment A.  Compartment B is filled with pure water.  The two compartments are separated by a porous semi-permeable membrane that allows the exchange of water molecules between the two compartments, but not that of the larger polysaccharide molecules.  part 1: Show that the chemical potential of water in compartment A is lower than that in compartment B by 2.48 J/mol.

Three proteins with an overall charges of 0, -5, and -8 are passed through an anion exchange column equilibrated in a buffer with low ionic strength and eluted with an increasing gradient of salt in a buffer. Which protein will elute last from the column? 1. Protein with no charge. 2. Protein with eight negative charges. 3. Protein with five negative charges. 4. Both charged proteins will elute at the same time.

Discuss the permeability of the phospholipid bilayer to the molecules and ions listed below. Is the bilayer freely permeable, somewhat permeable, or impermeable to each of these? 1. OH- 2. H* 3. 0₂ 4. C6H12O6 5. H₂O 6. CO₂ Which is not a major function of the protein in cell membranes? They are important for membrane transport They are important for cell-to-cell joining They function as enzymes They regulate membrane fluidity Which is not true about cell membranes? They frequently flip-flop from one side of the membrane to the other - They can move freely within one side of the bilayer Fatty acid tails of phospholipids form the membrane interior The interior of the bilayer is hydrophoic

Lipid bilayers form spontaneously in a process driven by the hydrophobic effect. Explain how the hydrophobic effect drives bilayer formation from individual lipids in an aqueous environment. Describe how the physical properties of the lipid bilayer are determined by the chemical properties of the membrane lipid components. Diagrams are encouraged for both parts of the question.