Biochem Module 5 Questions and Answers 100% Verified

Biochem Module 5 Questions and Answers 100% Verified Glycerol contains how many carbon atoms? - 3 - 4 - 5 - 15 - 3 Which of the following are derived from or made from fatty acids? - Cholesterol - Carotenoids - Phosphoglycerides - Both A and B - Both A and C - Phosphoglycerides Triacylglycerols are made from a ________ and ________. - glycerol; cholesterol Correct! - glycerol; three fatty acids - ceramide; three fatty acids - ceramide; three cholesterols - carotenoid; two cholesterols - glycerol; three fatty acids PUFA polyunsaturated fatty acid - 2 or more double bonds A ________ is a carboxylic acid that is a structural component of lipids. - Amino acid - Carotenoid - Sphingolipid - cholesterol - None of the above - None of the above A particular lipid is a liquid at room temperature, so it is called a(n) ________. - Oil - Fat - Lipid - Membrane - Sphingolipid - Oil ________ are a class of membrane proteins that are loosely associated with the membrane bilayer. - Transmembrane protein - Integral protein - Channel protein - Transport protein - Peripheral protein - Peripheral protein Isoprene units are used to make all of the following except __________. A. Fatty acids B. Carotenoid molecules C. Sphingolipids D. Both B and C E. All of the above A. Fatty acids Which notation is for a fatty acid with one double bond? A) 18:1( Δ 12) B) 1:18 ( C) 1:12 ( D) 2:18 ( E) 12:1(7,9) A) 18:1( Δ 12) Which notation indicates a 14-carbon omega-3 fatty acid that contains no other double bonds? A) 14:1 Δ 11) ( B) 17:1 Δ 14) ( C) 14:1 Δ3) ( D) 13:1(Δ11) E) 14:0( Δ 11) A) 14:1 Δ 11) __________ is used as the backbone molecule in the formation of storage fats. - Ceramide - Glucose - Sphingolipid - Glycerol - Phosphoglycerol - Glycerol __________ molecules determine blood type in humans. - Sphingolipids - Triacylglycerols - Cholesterol - Phosphoglycerides - carotenoid - Sphingolipids ________ are found in high concentrations in the membranes of the myelin sheath. - Fatty acids - Cholesterol - Triacylglycerols - Sphingolipids - Vitamin K molecules - Sphingolipids In a sphingolipid, the fatty acids are attached at carbon-2 by this type of linkage? - Amide linkage - An ether linkage - An alcohol linkage - A peptide linkage - Alkyl linkage - Amide linkage Membrane proteins: - Are sometimes peripheral - Are sometimes integral -Are types of lipids - Both A and B - None of the above - Both A and B Peripheral membrane proteins - Go all the way through the membrane - Can be chemically separated from the membrane - Are firmly attached to the membrane - Are lipids - None of the above - Can be chemically separated from the membrane Which statement best describes a general feature of membranes? - The membrane breaks easily - Individual lipid molecules stay in one place - The polar heads face inward - The interior of the lipid bilayer is very polar - The membrane is fluid - The membrane is fluid Which vitamin is critical for blood coagulation? - Vitamin A - Vitamin B - Vitamin C - Vitamin D - Vitamin K - Vitamin K What molecule is not found in membrane bilayers? - Phosphoglycerides - Sphingolipid - Cholesterol - Integral proteins - None of these - None of these What molecule that protects against UV rays is found both in bacteria and in the eyes? - Phosphoglycerides - Triacylglycerol - Cholesterol - Carotenoid - Vitamin K - Carotenoid What molecule has four fused rings in its structure? - Sphingolipid - Carotenoid - Triacylglycerol - Cholesterol - Water - Cholesterol In triacylglycerols, fatty acids are attached to glycerol via ______ linkage. -O-CO- -NH- -O-NH- -COO- -C=C- -O-CO- A lipid is __________. - A fat - An oil - A molecule that dissolves in a non-polar solvent - Is made from isoprene units - Is water soluble - A molecule that dissolves in a non-polar solvent What is the effect of a double bond on structure of fatty acids? Fatty acids with double bonds are referred to as unsaturated fatty acids. Most double bonds cause the fatty acids to bend or kink about in solution. This bending reduces the packing structure of fatty acids making them more liquid-like. Where in the body are membranes found? In the cell. The cell, itself, and the organelles have membranes. What type of lipid contains a ceramide? What is the purpose of this lipid? Sphingolipids contains a ceramide. The purpose of this lipid is to form the structure of membrane bilayers and in the myelin sheath of neurons. They also aid in defining blood type in individuals. What is the most significant chemical difference between triacylglycerols and phosphoglycerides that lead to their different functions? Phosphoglycerides have two fatty acid attached to the glycerol. Triacylglycerols have three fatty acids. Phospoglycerides also have a polar head group attached. What is the fluid mosaic model and what feature of the cells does it help us understand? The fluid mosaic model helps us understand biological membranes. It describes the fluid, complex nature of the membrane bilayer. Membranes have lipids and proteins in a rich mixture to help the cell survive.