Answered: 23. The cell membrane is made of a… | bartleby

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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23. The cell membrane is made of a bilayer of..
A. triglycerides with their nonpolar tails facing toward the center of the cell
B. triglycerides with their nonpolar tails facing outward to the exterior of the cell
C. glycerophospholipids with their nonpolar tails facing toward the center of the cell
D. glycerophospholipids with the nonpolar tails facing outward to the exterior of the cell

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4. The graph below represents two different modes of transport across a biological membrane. One employs a membrane protein and the other does not. Which line represents transport with a membrane protein? Label each line with the mode of transport. There are three key characteristics of transport across a biological membrane using a membrane protein. What are these three key features? List and describe each feature. 107 A B Concentration difference across the mebrane Rate of Transport
9. Look at the protein below. Label the diagram on the right and show which part of the protein has hydrophobic amino acid residues and what part of the protein has hydrophilic amino acid residues. Explain how you know.
13. The structure of a lipid bilayer is determined by the particular properties of its lipid molecules. What would happen if all of the hydrocarbon tails were saturated?
1.Globular proteins fold up in compact, spherical structures that have uneven surfaces. They tend to form multi-subunit complexes, which also have a rounded shape. Fibrous proteins, on the other hand, span relative large distances within the cell and in the extracellular space. Which of the proteins below are fibrous proteins? a. collagen, keratin b. tubulin and actin monomers c. elastase, pepsin d. hemoglobin and myoglobin 2. Which of the following statements is correct regarding oxidoreductase enzymes? a. NADH + H+/NAD+ are involved in catabolism and NADPH + H+/NADP+ participate in anabolism. b. The oxidation of the reduced member of a redox pair is associated to a ΔΔG < 0. c. The reduction of the oxidized member of a redox pair is associated to a ΔΔG > 0 d. All of the above e. None of the above 3.Which of the following statements is incorrect? a. We only need to consume vitamins in small amounts b. Vitamins are precursors to…
1) Placing phospholipids in water will spontaneously form a spherical structure called a:Group of answer choices lumen ball sphingoid cytoskeleton liposome 2) Saturated fatty acidsGroup of answer choices Have each carbon "saturated" with hydrogen Have each carbon "saturated" with other carbons Have each carbon "saturated" with hydrogen and are solids at room temperature Are solids at room temperature Contain double bonds 3) In intestinal epithelia, glucose can be taken into cells against its concentration gradient. How can glucose be transported against its concentration gradient without the direct expenditure of ATP in intestinal epithelial cells?Group of answer choices It uses simple diffusion It uses the Glut1 transporter It uses the Glucose ATPase It uses the Glucose/Na+ symporter None of the above. Due to the Second Law of Thermodynamics, molecules cannot be moved against their concentration gradient.
6. A control phospholipid membrane is isolated in which the phospholipid tails all have an 18-C chain length and are comprised of a 50:50 mixture of saturated and unsaturated tails. In addition, about 25% of the lipids are fluorescently labeled on the head groups. a) Draw a single plot of Fluidity vs. Temperature that contains the expected curves for: Control phospholipid (line- -) Control supplemented with 18-C saturated phospholipids (dashed line - Control supplemented with 16-C chain length (dotted line • • • • • • ) b) Draw a single plot of the Fluorescence Intensity vs. Time that contains the expected curves of a Fluorescence Recovery After Photobleaching (FRAP) using the same samples as in (a) above. The FRAP experiment is conducted at the same temperature for each sample (which is the Tm of the of the control phospholipid).
9. Potassium cyanide is known to interfere with the formation and use of ATP in cell metabolism. If the use of potassium cyanide resulted in a decelerated entry of a solute into a cell, it may be reasonably assumed that, under normal circumstances, the solute enters by A. Active transport B. Osmosis C. Simple diffusion D. Receptor-mediated endocytosis 10. Which statement is TRUE for cellulose, but NOT TRUE for protein? A. It is found in cell surface membranes. B. It is synthesised from identical subunits. C. It is used as an energy source. D. It may be a structural component.
Triheptanoin is a manufactured lipid. Glucose is a carbohydrate. The atoms in covalent bonds in Triheptanoin share electrons_____. The atoms in covalent bonds in glucose share electrons ______. ______ can get through the cell membrane without a transport protein. a) With unequal strength. With equal strength. Glucose. b) With unequal strength. With equal strength. Triheptanoin. c) With equal strength. With unequal strength. Glucose. d) With equal strength. With unequal strength. Triheptanoin.
cannot diffuse across a lipid bilayer. a. Water molecules b. Gases c. lons d. Nonpolar molecules
For biological membranes, which of the following statement is NOT true? A. The phospholipid bilayer is a fluid matrix. B. Protein can be anchored to the membrane by covalently linked lipid chains. C. Proteins can move laterally across the membrane. D. For organisms living in cold temperature, their cell membranes contain more triacylglycerols. E. Transverse motion of lipid molecules can occur occasionally. Enzyme lowers when... A. The energy difference between the substrate and the transition state B. The energy difference between the product and the transition state C. Both A and B D. Neither A nor B
Which of the following is incorrect about the collagen structure? a. The covalent cross-links between the individual chains stabilize the collagen structure b. None; all the other choices are correct The helical structure is cross-linked (with covalent bonds) at both ends Od. Gly residues are all located in the center of the helix (i.e. between the individual chains) C.
8. Glycoproteins can be found on the extracellular surface of cell membranes and are used to facilitate cell-cell interactions (connections, identification of cell type, and communication). How does the structure of this molecule allow for its function? How do you think the function of this glycolipid would change if 3 of the lipid was missing? Why?

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