Which of the following is incorrect regarding phospholipids?a. The heads are polar.b. The tails are nonpolar.c. They contain a phosphate group in place of one fatty acid.d. They are energy-storage molecules in the cell.
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Which of the following is incorrect regarding phospholipids?
a. The heads are polar.
b. The tails are nonpolar.
c. They contain a phosphate group in place of one fatty acid.
d. They are energy-storage molecules in the cell.
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- Phosphatidylinositol 4,5-bisphosphate (PIP2) is a __________ that carries a net __________ charge. A. glycerophospholipid; -1 B. glycerophospholipid; -2 C. glycerophospholipid; -4 D. sphingolipid; -2 E. sphingolipid; -3Which of the following statements is False?a. In starch breakdown, water is formed.b. In chitin, glucoses are linked as in cellulose.c. Peptide bonds determine primary peptide structure.d. Disulfide bridges are formed by covalent bonds.Fill out the boxes below about saturated and unsaturated fatty acid tails including the details asked for in the first column: Saturated Unsaturated Draw ONE phospholipid with that type of tail. B. Describe the type of bonds and the atoms those bonds are between that define the tail as saturated and unsaturated. C. Draw a membrane with 6+ phospholipids, all of which are made of that tail type. D. Identify if that tail type makes the membrane more fluid or more rigid.
- Proteins are the dominant structural and functional molecules in a cell. Which one of the following statements about proteins is NOT correct? A. The native conformation of a protein is usually arrived at very quickly after synthesis. B. Hydrogen bonding is the only type of bonding that gives rise to secondary structure. C. Urea denatures proteins by disrupting the interactions among non-polar (hydrophobic) amino acids D. Most proteins consist of a single polypeptide and thus do not have quaternary structure.A) Briefly describe the basic structure of phospholipids and explain how they can provide an effective barrier against the unregulated movement of molecules into or out of cells. B) Not all phospholipids are identical to one another. Describe two components (parts) of that can be altered to create variation between different phospholipids.What properties define the phospholipids that make up the lipid bilayer? Select all that apply. A. Nonpolar, hydrophobic hydrocarbon tails B. Polar, hydrophilic phosphate heads C. Nonpolar, hydrophobic phosphate heads D. Polar, hydrophilic hydrocarbon tails
- a. What characteristic of phospholipids makes them essentialcomponents of cell membranes?b. How are saturated and unsaturated fatty acids different?c. Why is the hydrophilic end of phospholipids attracted to water?The structure of a lipid bilayer is determined by the particular properties of its lipid molecules. What would happen if A. Phospholipids had only one hydrocarbon tail instead of two?B. The hydrocarbon tails were shorter than normal, say, about 10 carbon atoms long?C. All of the hydrocarbon tails were saturated?D. All of the hydrocarbon tails were unsaturated?E. The bilayer contained a mixture of two kinds of phospholipid molecules, one with two saturated hydrocarbon tails and the other with two unsaturated hydrocarbon tails?F. Each phospholipid molecule were covalently linked through the end carbon atom of one of its hydrocarbon tails to a phospholipid tail in the opposite monolayer?Which of the following is not a function of proteins? a. transport molecules b. acting as messengers c. supports the structure d. store genetic information What monomers join to form polypeptides? a. fatty acids b. nucleotides c. amino acids d. monosaccharides Which of the following is NOT a basic component of every amino acid? a. R group b. Amino group c. Carboxyl group d. Hydroxyl group What chemical bond links the amino group of one amino acid to the carboxyl group of the other? a. Ionic bond b. Peptide bond c. Covalent bond d. Hydrogen bond
- Which of the following statements concerning glycolipids is true? a. All glycolipids contain sphingosine. b. All glycolipids contain one sugar residue. c. All glycolipids contain phosphatidylglycerol. d. Some glycolipids contain ceramide, while others do not.Which of the following statements concerning fatty acids is correct? a. Used to make phospholipids b. They all contain one or more double bonds. c. They are a constituent of sterols. d. They are strongly hydrophilic.What is the role of glycerol in lipids? (Select one or more) A. Platform for attachment of polar side chains to cholesterol B. platform for fatty acids in phospholipids C. platform for fatty acids in fat D. platform for isoprenoid sidechain in steroids