Of the glycerophospholipids, sphingomyelin is structurally most similar to B. ph
ID: 206376 • Letter: O
Question
Of the glycerophospholipids, sphingomyelin is structurally most similar to B. phosphatidylethanolamine C. phosphatidylserine D. phosphatidylinositol. Which of the following statements is FALSE about biologieal membranes? A. Cholesterol can be present in biological membranes. B. Biological membranes are predominantly composed of triacylglycerols. C. The fluidity of biological membranes is affected by the presence and nunm D. Biological membranes often contain proteins in the lipid bilayer mber of double bonds in fatty acids Which is FALSE regarding membrane proteins? A. They can be covalently attached to lipids. B. They can be covalently attached to carbohydrates C. They often contain the specialized amino acid hydroxylysine D. They often diffuse laterally in the membrane. Which of the following statements about membranes is true? A. All proteins associated with biological membranes span the lipid bilayer at least once. B. Phospholipids can readily undergo lateral diffusion within the bilayer. C. Phospholipids can readily flip-flop from the inner to outer membrane surface. D. The lipid bilayer of membranes is freely permeable to ions The H'/K ATPase moves one HI' out of the cell and one K' into the cell. This transport is A. uniport and electrogenic. B. symport and electroneutral. C. antiport and electroneutral. D. passive and electrogenic. Which amino acids are most likely to be present lining the insids of a membrane-spanning K' lon channel? A. Phe, Trp, Val B. Arg. Lys, His C. Glu, Ser, Asp D. Cys, Lys, Ser The force that drives an ion through a membrane channel depends upon: A. the charge on the membrane lipids. B. the difference in electrical potential across the membrane. C. the size of the ion channel. D. the size of the ion. The ion channel that opens in response to acetylcholine is an example of a signal transduction system. A. G protein B. ligand-gated C. voltage-gated D. serpentine receptor Fill in the blanks. The Ga subunit of heterotrimerie G proteins is an important activator or the enzyme which produces the second messenger molecule A. adenylate cyclase (AC) and cyclic AMP (cAMP) B phospholipase A: (PLA:) and cyclic GMP (cGMP) C. adenylate cyclase and IP3 (inositol triphosphate). D phospholipase C and cyclic AMP.Explanation / Answer
Q.1. Answer is B
As glycerophosphides, sphingomylin is structurally more similar to PHOSPHATIDYLETHANOLAMINE.
Q. 2 Answer is B
As diglycerides and cholesterol necessary components of plasma membranes, but the closely related triglycerides and cholesterol esters never present.
Q.3 Answer is A
Van der Waals is the noncovalent force which favors close packing of the tails of the lipids in a membrane.
Q.4. Answer is C
As phospholipida can redily flip flopp from innner to outer cell surface
Q.5. B Answer is A
electrogenic uniport
Q.6. answer is A
Q.7. Answer is C
Q.8.Answer is C
Q.9. Answer is D
it activate phospholipase C Which produce secondary messanger cyclic AMP
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