Description : All the following processes occur rapidly in the membrane lipid bilayer except (A) Flexing of fatty acyl chains (B) Lateral diffusion of phospholipids (C) Transbilayer diffusion of phospholipids (D) Rotation of phospholipids around their long axes
Last Answer : (C) Transbilayer diffusion of phospholipids
Description : Which of the following phospholipids is localized to a greater extent in the outer leaflet of the membrane lipid bilayer? (A) Choline phosphoglycerides (B) Ethanolamine phosphoglycerides (C) Inositol phosphoglycerides (D) Serine phosphoglycerides
Last Answer : A
Last Answer : (A) Choline phosphoglycerides
Description : The plasma membrane consists mainly of (a) phospholipids embedded in a protein bilayer (b) proteins embedded in a phospholipid bilayer (c) proteins embedded in a polymer of glucose molecules (d) proteins embedded in a carbohydrate bilayer
Last Answer : (b) proteins embedded in a phospholipid bilayer
Description : The major lipid in chylomicrons is (A) Triglycerides (B) Phospholipids (C) Cholesterol (D) Free fatty acids
Last Answer : Answer : A
Description : Which of the following statement(s) is/are true concerning the cell plasma membrane? a. The plasma membrane is composed of amphipathic molecules b. The hydrophobic core of the lipid bilayer of the ... contribute to the cell coat d. The membrane proteins of nerve cells are highly voltage-dependent
Last Answer : Answer: a, b, d The plasma membrane defines the boundary of the cell and serves to contain and concentrate enzymes and other macromolecule constituents. The plasma membrane is ... and bear carbohydrate moieties primarily as oligosaccharide chains that contribute to the cell coat or glycocalyx
Description : According to widely accepted fluid mosaic model cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several ... domains of the membrane. (d) Many proteins remain completely embedded within the lipid bilayer.
Last Answer : (b) Proteins can also undergo flip-flop movements in the lipid bilayer.
Description : The membrane protein that extend through both sides of lipid bilayer. (a) Acidic protein (b) Glycoprotein © Intrinsic protein (d) Glycolic acid
Last Answer : Answer: c Intrinsic protein
Description : Long chain fatty acyl CoA esters are transported across the mitochondrial membrane by (A) cAMP (B) Prostaglandin (C) Carnitine (D) Choline
Last Answer : Answer : C
Description : Long chain fatty acids penetrate the inner mitochondrial membrane (A) Freely (B) As acyl-CoA derivative (C) As carnitine derivative (D) Requiring Na dependent carrier
Description : The importance of phospholipids as constituent of cell membrane is because they possess (A) Fatty acids (B) Both polar and nonpolar groups (C) Glycerol (D) Phosphoric acid
Last Answer : Answer : B
Description : How do phospholipids with unsaturated hydrocarbon chains affect membrane fluidity?
Last Answer : Need answer
Description : A lipid bilayer is permeable to (A) Urea (B) Fructose (C) Glucose (D) Potassium
Description : When comparing bacterial and archaeal cell membranes, only bacterial cell membranes a. Have three layers of phospholipids. b. Have a phospholipid bilayer. c. Are fluid. d. Have ether linkages.
Last Answer : b. Have a phospholipid bilayer.
Description : Intermediate in the denovo synthesis of triacyl glycerols include all the following except (A) Fatty acyl CoA (B) CDP diacyl glycerol (C) Glycerol-3-phosphate (D) Lysophosphatidic acid
Description : During each cycle of on going fatty acid oxidation, all the following compounds are generated except (A) H2O (B) Acetyl CoA (C) Fatty acyl CoA (D) NADH FATS AND FATTY ACID METABOLISM 103
Description : During each cycle of β-oxidation of fatty acid, all the following compounds are generated except (A) NADH (B) H2O (C) FAD (D) Acyl CoA
Description : Phospholipids occur in (A) Myelin sheath (B) Stabilizes chylomicrans (C) Erythrocyte membrane (D) All of these
Last Answer : Answer : D
Description : The basic structure of cell membranes (a) Is a lipid bilayer that serves as a barrier to water soluble molecules (b) Differs ultra structurally for internal and external membranes ... dispersed within a protein bilayer (d) Is visualised as bilaminar structure with transmission electron microscopy
Last Answer : Ans:(a)
Description : Fatty acids can be transported into and out of cell membrane by (A) Active transport (B) Facilitated transport (C) Diffusion (D) Osmosis
Last Answer : B
Description : Which of the following statements is not true about phospholipids? (a) They are similar to triacylglycerols except that the middle OH group of glycerol reacts with a phosphate rather than with a ... is a phospholipid. (d) The C-2 carbon of glycerol in phosphoacylglycerols has the R configuration
Last Answer : They are similar to triacylglycerols except that the middle OH group of glycerol reacts with a phosphate rather than with a fatty acid
Description : Long chain fatty acids are first activated to acyl CoA in the (A) Cytosol (B) Mitochodria (C) Ribosomes (D) Microsome
Description : Fatty liver is caused due to accumulation of (A) Fatty acids (B) Cholesterol (C) Phospholipids (D) Triacylglycerol
Description : Very low density lipoproteins are relatively rich in (A) Cholesterol (B) Triacyl glycerol (C) Free fatty acids (D) Phospholipids
Description : CTP is required for the synthesis of (A) Fatty acids (B) Proteins (C) Phospholipids (D) Cholesterol
Description : Phospholipids help the oxidation of (A) Glycerol (B) Fatty acids (C) Glycerophosphates(D) None of these
Description : The rate of fatty acid oxidation is increased by (A) Phospholipids (B) Glycolipids (C) Aminolipids (D) All of these
Description : The combination of an amino alcohol, fatty acid and sialic acid form (A) Phospholipids (B) Sulpholipids (C) Glycolipids (D) Aminolipids
Description : Lipids are stored in the body mainly in the form of (A) Phospholipids (B) Glycolipids (C) Triglycerides (D) Fatty acids
Description : Unsaturated fatty acids is known as (A) Non-essential fatty acids (B) Essential fatty acids (C) Cerebrosides (D) Phospholipids
Description : Insulin regulates fatty acid synthesis by (A) Dephosphorylating of acetyl CoA carboxylase (B) Activating phosphorylase (C) Inhibiting malonyl CoA formation (D) Controlling carnitine-Acyl CoA transferase activity
Description : This catalyzes formation of CoA derivatives from fatty acid, CoA and ATP: (A) Acyl CoA dehydrogenase (B) Enoyl hydrase (C) β-OH acyl CoA dehydrogenase (D) Thio kinase
Description : FAD containing enzyme, catalyzing formation of α, β unsaturated fatty acyl CoA derivative. (A) Acyl CoA dehydrogenase (B) Enoyl hydrase (C) β-OH acyl CoA dehydrogenase (D) Thiolase
Description : Both Acyl carrier protein (ACP) of fatty acid synthetase and coenzyme (CoA) are (A) Contain reactive phosphorylated (B) Contain thymidine (C) Contain phosphopantetheine reactive groups (D) Contain cystine reactive groups
Description : The enzyme regulating extramitochondrial fatty acid synthesis is (A) Thioesterase (B) Acetyl CoA carboxylase (C) Acyl transferase (D) Multi-enzyme complex
Description : Synthesis of polyunsaturated fatty acids involves the enzyme systems: (A) Acyl transferase and hydratase (B) Desaturase and elongase (C) Ketoacyl-CoA reductase and hydratase (D) Dihydroxyacetone phosphate
Description : Conversion of fatty acyl-CoA to an acylCoA derivative having 2 more carbon atoms involves as acetyl donar: (A) Acetyl-CoA (B) Succinyl-CoA (C) Propionyl-CoA (D) Malonyl-CoA
Description : In fatty acids synthase of both bacteria and mammals, ACP (acyl carrier protein) contain the vitamin: (A) Thiamin (B) Pyridoxine (C) Riboflavin (D) Pantothenic acid
Description : The protein, which is in fact a multifunctional enzyme complex in higher organism is (A) Acetyl transacylase (B) Malonyl transacylase (C) 3-Hydroxy acyl-ACP dehyratase (D) Fatty acid synthase
Description : Acetyl-CoA is the principal building block of fatty acids. It is produced within the mitochondria and does not diffuse readily into cytosol. The availability of acetyl CoA involves (A) Carnitine acyl transferase (B) Pyruvate dehydrogenase (C) Citrate lyase (D) Thiolase
Description : Acetyl CoA required for extra mitochondrial fatty acid synthesis is produced by (A) Pyruvate dehydrogenase complex (B) Citrate lyase (C) Thiolase (D) Carnitine-acyl transferase
Description : Acyl carrier protein is involved in the synthesis of (A) protein (B) glycogen (C) fatty acid outside the mitochondria (D) fatty acid in the mitochondria
Description : The carbon chain of fatty acids is shortened by 2 carbon atoms at a time. This involves successive reactions catalysed by 4-enzymes. These act the following order: (A) Acetyl CoA dehydrogenase, ... CoA dehydrogenase (D) Enoyl hydrase, β-OH acyl CoA dehydrogenase, acyl CoA dehydrogenase, thiolose,
Description : Fatty acids are activated to acyl CoA by the enzyme thiokinase: (A) NAD+ (B) NADP+ (C) CoA (D) FAD+
Description : The enzyme acyl-CoA synthase catalyses the conversion of a fatty acid of an active fatty acid in the presence of (A) AMP (B) ADP (C) ATP (D) GTP
Description : Phospholipids are important cell membrane components since (A) They have glycerol (B) Form bilayers in water (C) Have polar and non-polar portions (D) Combine covalently with proteins
Description : Across a membrane phospholipids act as carrier of (A) Organic compounds (B) Inorganic ions (C) Nucleic acids (D) Food materials
Description : Phospholipids are important cell membrane components because (A) They have glycerol (B) They can form bilayers in water (C) They have both polar and non polar potions (D) They combine covalently with proteins
Description : What inside of a membrane bilayer is?
Last Answer : hydrophobic
Description : Select the correct statement from the following regarding cell membrane. (a) Na+ and K+ ions move across cell membrane by passive transport. (b) Proteins make up 60 to 70% of the cell ... towards the inner part. (d) Fluid mosaic model of cell membrane was proposed by Singer and Nicolson
Last Answer : (d) Fluid mosaic model of cell membrane was proposed by Singer and Nicolson.