Đề 4 – Bài tập, đề thi trắc nghiệm online Hóa sinh lipid

A A. They are soluble in water and lipids. B B. They have both hydrophilic and hydrophobic regions. C C. They are only found in animal cells. D D. They can only interact with proteins.

A A. Synthesis of fatty acids; stimulated by insulin. B B. Breakdown of triacylglycerols into fatty acids and glycerol; stimulated by glucagon and epinephrine. C C. Synthesis of triacylglycerols from fatty acids and glycerol; stimulated by glucagon. D D. Breakdown of cholesterol; stimulated by insulin.

A A. Transport cholesterol from the liver to peripheral tissues. B B. Transport dietary triacylglycerols from the intestine to other tissues. C C. Synthesize fatty acids in the liver. D D. Break down cholesterol in the blood.

A A. Stimulates fatty acid oxidation and ketogenesis. B B. Inhibits fatty acid synthesis and triacylglycerol storage. C C. Stimulates fatty acid synthesis and triacylglycerol storage. D D. Has no significant effect on lipid metabolism.

A A. Transport dietary cholesterol. B B. Transport endogenous triacylglycerols from the liver to peripheral tissues. C C. Transport cholesterol to the liver. D D. Break down fats in adipose tissue.

A A. To synthesize fatty acids. B B. To activate fatty acids by attaching CoA for transport into mitochondria or other metabolic reactions. C C. To break down fatty acids into acetyl-CoA. D D. To incorporate fatty acids into triacylglycerols.

A A. They contain fatty acids. B B. They have a phosphate group. C C. They contain a sphingosine backbone instead of glycerol. D D. They are amphipathic.

A A. Inner mitochondrial membrane B B. Cytosolic side of the plasma membrane C C. Extracellular side of the plasma membrane D D. Endoplasmic reticulum lumen

A A. VLDL B B. LDL C C. HDL D D. Chylomicrons

A A. Amylase B B. Lipase C C. Protease D D. Nuclease

A A. Storage form of glucose. B B. Alternative fuel molecules synthesized from acetyl-CoA during fatty acid breakdown. C C. Building blocks for fatty acid synthesis. D D. Hormones derived from cholesterol.

A A. Structural lipids in cell membranes. B B. Hormone-like signaling molecules involved in inflammation, pain, and fever. C C. Energy storage molecules in adipose tissue. D D. Enzymes that digest dietary lipids.

A A. To store lipids for energy. B B. To increase membrane fluidity. C C. To organize membrane proteins and lipids, participating in cell signaling and trafficking. D D. To break down lipids for recycling.

A A. Mitochondria B B. Endoplasmic reticulum C C. Cytosol D D. Lysosomes

A A. Glucose B B. Acetyl-CoA C C. Pyruvate D D. Amino acids

A A. They transport triacylglycerols to the liver. B B. They promote the removal of cholesterol from arteries. C C. They can deposit cholesterol in arterial walls, contributing to plaque formation. D D. They increase the levels of HDL cholesterol.

A A. It is involved in fatty acid oxidation and is activated by insulin. B B. It is the rate-limiting enzyme in cholesterol synthesis and is inhibited by cholesterol. C C. It breaks down cholesterol and is activated by glucagon. D D. It is involved in triacylglycerol synthesis and is inhibited by fatty acids.

A A. Long-term energy storage B B. Structural components of cell membranes C C. Catalysis of biochemical reactions D D. Signaling molecules (hormones)

A A. By inhibiting the synthesis of cholesterol. B B. By inhibiting cyclooxygenase (COX) enzymes. C C. By increasing the synthesis of prostaglandins. D D. By blocking receptors for prostaglandins.

A A. Brain B B. Muscle C C. Liver D D. Adipose tissue

A A. Cholesterol synthesis B B. Mitochondrial fatty acid oxidation C C. Very-long-chain fatty acid (VLCFA) oxidation D D. Triacylglycerol digestion

A A. To inhibit fatty acid oxidation. B B. To regulate gene expression involved in lipid metabolism, particularly fatty acid oxidation and lipid uptake. C C. To directly synthesize fatty acids. D D. To transport lipids across cell membranes.

A A. Palmitic acid B B. Oleic acid C C. Arachidonic acid D D. Stearic acid

A A. Triacylglycerols B B. Phospholipids C C. Steroids D D. Fatty acids

A A. Glucose B B. Pyruvate C C. Acetyl-CoA D D. Fatty acids

A A. By increasing the absorption of cholesterol from the diet. B B. By inhibiting HMG-CoA reductase. C C. By promoting the synthesis of bile acids. D D. By increasing the activity of LDL receptors.

A A. To hydrolyze triacylglycerols into fatty acids. B B. To emulsify dietary fats, increasing the surface area for lipase action. C C. To transport fatty acids into intestinal cells. D D. To synthesize triacylglycerols from fatty acids.

A A. Number of carbon atoms B B. Presence of double bonds C C. Type of functional group D D. Overall molecular weight

A A. Glucose B B. Acetyl-CoA C C. Fatty acids D D. Amino acids

A A. To transport fatty acids from the cytosol into the mitochondrial matrix. B B. To synthesize carnitine in the liver. C C. To break down fatty acids in the cytosol. D D. To transport acetyl-CoA out of the mitochondria.