Biochemistry: The Molecular Basis of Life
6th Edition
ISBN: 9780190209896
Author: Trudy McKee, James R. McKee
Publisher: Oxford University Press
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Chapter 11, Problem 7Q
Summary Introduction
To review:
The modes of transportation of the following molecules across the plasma membrane:
a. CO2 (Carbon dioxide)
b. Glucose
c. Cl– (Chloride ions)
d. K+ (Potassium ions)
e. Fat molecules
f.α-Tocopherol
Introduction:
The transportation of a typical
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Chapter 11 Solutions
Biochemistry: The Molecular Basis of Life
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biochemistry and related others by exploring similar questions and additional content below.Similar questions
- CO2 can cross the plasma membrane by diffusion. If a cell is in the process of metabolizing glucose, which direction would diffusion tend to carry CO2 molecules? (It may help to consider: where is CO2 highly concentrated? Would diffusion carry CO2 toward or away from this location? Group of answer choices A. From inside the cell to outside the cell B. From outside the cell to inside the cell C. not enough info to tellarrow_forwardList the most likely cellular component or organelle that houses each of the following enzymes/proteins: (a) Enolase (b) Glycosyl transferase - this enzyme catalyzes the addition of glycosyl residues (carbohydrates) to proteins, resulting in the formation of modified, functional glycoproteins (c) Na+-K+ exchange transporter: This protein is responsible to shuttle Nat and K+ ions into and outside cellsarrow_forwardMovement of glucose down its concentration gradient into cells is facilitated by Select one: a. Active transport b. Diffusion across phospholipids c. Facilitated transport d. a protein that consumes ATP e. a protein that gets phosphorylatedarrow_forward
- Cells transporting substances across their membranes is essential. Choose TWO of the following types of cellular transport. ๏osmosis ๏active transport ๏facilitated diffusion ๏endocytosis / exocytosis (a)For each type of transport you choose, describe the transport process. Explain how the organization of cell membrane plays a role the movement of specific molecules across membrane. (b)Using the same transport types, identify a specific cell that utilizes that type of transit (i.e. one cell for each transport type, or two different cell examples), and detail a substance that is transferred. (c)A typical human lymphocyte has a radius of about 10 μm, while a typical bacterium (e.g., S. pneumoniae) has a radius of about 1 μm. Assuming that both cell types are perfectly spherical, compare and contrastthe transport mechanisms for each of these cells.arrow_forwardOf the following cell membrane lipids, which one 1) prefers to reside in the inner leaflet (or inner half) of the membrane bilayer, AND 2) is not zwitterionic at physiological pH (7.4)? 1. SM (sphingomyelin) is inner-leaflet & NOT zwitterionic 2. PC (phosphatidylcholine) is inner-leaflet & NOT zwitterionic 3. PS (phosphatidylserine) is inner-leaflet & NOT zwitterionic 4. 2 of these 3 responses are correctarrow_forwardWhich of the following statements is CORRECT about the fatty acid residues in membrane lipids? A. Whole swathes of the membrane have higher saturated residues to increase the overall surface tension. B. There are more unsaturated units to maintain the fluidity of the structure at all environmental temperatures. C. More unsaturated residues are present to increase the melting point of the membrane making it resilient. D. Larger quantities of saturated units are present to maximize stacking and provide effective barrier capacity.arrow_forward
- Which of the following does not apply to lipid asymmetry? a.It arises in the endoplasmic reticulum. b.It arises due to the flip-flop movement of specific phospholipids to the cytosolic monolayer. c.It is preserved throughout vesicular transport. d.It depends on the activity of flippase.arrow_forwardInhibition of the Na,K-ATPase might reasonably result in which of the following: a.) gradual cellular accumulation of K+ b.) gradual decrease in cytoplasmic Na+ c.) cell shrinkage d.) hyperpolarization of the membrane potential e.) reduced activity of many secondary active transportersarrow_forwardWhich of the following statements is correct? A. Short-chain fatty acids have higher transition temperatures than do long-chain fatty acids making membranes enriched in shor chain fatty acids less fluid. B. Long-chain fatty acids have higher transition temperatures than do short-chain fatty acids making membranes enriched in long chain fatty acids more fluid. C. Long-chain fatty acids have higher transition temperatures than do short-chain fatty acids making membranes enriched in long- chain fatty acids less fluid D. Short-chain fatty acids have higher transition temperatures than do long-chain fatty acids making membranes enriched in short- chain fatty acids more fluid. B OD OC OA O All are incorrectarrow_forward
- Which of the following is true about motion of membrane lipids? A. They can move most rapidly when in the gel phase. B. Lateral diffusion is catalyzed by flippase proteins. C. To increase the fluidity of membranes at low temperatures, cells synthesize more saturated fatty acids and fewer unsaturated fatty acids. D. Transbilayer diffusion involves the transfer of lipids from one face of the bilayer to another.arrow_forwardWhich of the following statements about binding between cytosolic proteins and phospholipids is true? a. Phospholipids do not possess the appropriate features to bind to cytosolic proteins. b. Binding between cytosolic proteins and phospholipids is non-specific and does not require molecular complimentarity. c. The ability of a cytosolic protein and a phospholipid to bind can be changed by phosphrylation of the phospholipid. For example, different phosphoinositides bind to different cytosolic proteins. d. Phospohorylation of phosphoinositides occurs randomly, whereas protein phosphorylation is mediated by kinases and phosphotases. Please answer asap and type your answer and do not copy from anywhere please answer asaparrow_forwardDefine the following terms: a. lipid bilayer b. fluid mosaic model c. membrane fluidity d. flippase e. floppasearrow_forward
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