Concept explainers
In the plasma membrane, _____ form(s) the lipid bilayer, __________determine(s) the fluid nature of the membrane, and __________
mainly determine(s) the function of the membrane.
a. phospholipids, cholesterol, proteins
b. phospholipids, proteins, cholesterol
c proteins, cholesterol, phospholipids
d. cholesterol, phospholipids, proteins
c. cholesterol, proteins, phospholipids
Introduction:
The proteins are made of amino acids. The amino acids are of 20 types that combine in a varied manner to form proteins. The amino acids join together by peptide bonds. Proteins act as major substrates and reactants for the metabolic pathways. All the enzymes in the body that are crucial for the biochemical reactions are proteins.
Answer to Problem 1RAC
The correct answer is option (a) phospholipids, cholesterol, proteins.
Explanation of Solution
Explanation/justification for the correct answer:
Option (a) phospholipids, cholesterol, proteins. The phospholipids form the bilayer of the cell membrane, and the cholesterol promotes fluidity of the membrane to allow the movement of cytoplasm inside and the protein play a different role in the function of the cell membrane. So, the correct answer is option (a).
Explanation for incorrect answer:
Option (b) phospholipids, proteins, cholesterol. Phospholipids make up the lipid bilayer, and the cholesterol promotes fluidity to steroid and alcohol in its structure, and so it does not provide the function to the membrane. So, this is an incorrect option.
Option (c) proteins, cholesterol, phospholipids. The phospholipids form the bilayer that is integrated with proteins and protein do not form the bilayer of the plasma membrane. So, this is an incorrect answer.
Option (d) cholesterol, phospholipids, and proteins. Cholesterol does not make the bilayer; the bilayer is made up of phospholipids and embedded proteins. So, this is an incorrect answer.
Option (e) cholesterol, proteins, phospholipids. Phospholipids only make up the structure of the cellular membrane and do not determine the function of the membrane; this function is carried out by protein that is intrinsic and extrinsic. So, this is an incorrect answer.
Phospholipids form the bilayer which is made up of two lipid layers making a sandwich with protein embedded in between two layers; cholesterol provides fluidity and proteins help to determine the function of the membrane. Hence, the correct answer is option (a) phospholipids, cholesterol, proteins.
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Chapter 3 Solutions
SEELEY'S ANATOMY+PHYSIOLOGY
- Which plasma membrane component can be either found on its surface or embedded in the membrane structure? a. protein b. cholesterol c. carbohydrate d. phospholipidarrow_forwardMark the following statements about the plasma membrane as true or false. If a statement is false, correct it to make a true statement. a. _____ Integral membrane proteins generally span the width of the plasma membrane, whereas peripheral proteins are found on only one side of the membrane. b. _____ Cholesterol provides the plasma membrane with stability in the face of changing ion concentrations . c. _____ Membrane cholesterol is vitally important for cell-cell recognition. d. _____ Membrane proteins often function as channels or carriers. e. _____ The overall structure of the plasma membrane is a mosaic with the components locked tightly in placearrow_forwardIndicate whether the following statements are true or false. If a statement is false, explain why it is false. a. All types of cells contain cell walls, but only some cell types possess plasma membranes. b. The distribution of specific lipids to the inner and outer leaflet is asymmetrical, or biased, in plasma membranes. C. Lateral diffusion is the movement of lipids from one layer of the membrane to the other. d. Fatty acids tails are used to embed integral, transmembrane proteins in the plasma membrane.arrow_forward
- which one of the following diffuses more readily through the lipid bilayer of a plasma membrane a. polar molecules b. non polar molecules c. ionized molecules d. waterarrow_forwardWhich 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_forwardThe plasma membrane is composed of a variety of lipid molecules. 1. Phosphatidylethanolamine 2. Phosphatidylcholine 3. Phosphatidylinositol 4. Phosphatidylserine 5. Sphingomyelin 6. Glycolipids 7. Cholesterol. Which lipids contain sugar molecules?arrow_forward
- Membrane proteins perform the following functions EXCEPT one. Which One? A. form the glycocalyx B. act as receptor proteins C. form pores to allow the passage of small solutes D. behave as enzymes.arrow_forwardWhich of the following are essential components of cell membrane? a. Cholesterol b.Phospholipids c.Long chain polyunsaturated fatty acids d.All of the abovearrow_forwardStatements:(1) Fats and oils have the same general chemical structure.(2) Biological waxes have a three-component “block diagram.”(3) In facilitated transport, a substance crosses a cell membrane with the help of a protein “pump.” a. All three statements are true. b. Two of the three statements are true. c. Only one of the statements is true. d. None of the statements is true.arrow_forward
- Which of the following is NOT a function of membrane proteins? a.Regulate the passage of ions b.Act as carrier molecules for various solutes c.Act as anchors or stabilizers for the cell membrane d.Storage of cellular nutrientsarrow_forwardWhich of the following is NOT a component of the cell plasma membrane? A. cholesterol B. proteins C. microfi laments D. phospholipidsarrow_forwardConsider the following diagram of the cell membrane. Which of the statements is NOT true regarding the cell membrane? Group of answer choices a. Proteins and carbohydrates are also components of the cell membrane. b. Certain phospholipids and proteins on the outer surface of the cell membrane are attached to carbohydrates. c. Some carbohydrates extend through the entire lipid bilayer and appear on both surfaces of the membrane d. Some of the proteins embedded in the cell membrane constitute channels (passage canals).arrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College