Concept explainers
In what way do the membranes of a eukaryotic cell vary?
- A. Phospholipids are found only in certain membranes.
- B. Certain proteins are unique to each kind of membrane.
- C. Only certain membranes of the cell are selectively permeable.
- D. Only certain membranes are constructed from amphipathic molecules.
Introduction:
The lipid bilayer model of the membrane consists of proteins and lipids with triacylglycerols. This structure maintains the fluidity of membrane. Various phospholipids are present in the membrane. They consist of a hydrophilic head and a hydrophobic tail. The presence of the lipid cholesterol provides flexibility to the membrane at various temperatures. Various unique proteins are present in the membrane like cell signaling proteins and growth receptors.
Answer to Problem 1TYU
Correct answer:
The membrane is unique and consists of lipids and proteins. The proteins present in the membrane are specific and form an essential part of cell signaling and growth receptor signaling response. Therefore, option (B) is correct.
Explanation of Solution
Reason for the correct statement:
The membrane of the cells contains unique proteins. The proteins are present in the membrane are specific and help in the signaling inside the cells by the activation of the protein growth factor receptors.
Option (B) is given as “Certain proteins are unique to each kind of membrane”.
As, “the proteins present in the membrane of a eukaryotic cell are unique and perform specific functions according to the type of proteins present in the cell”, it is the right answer.
Hence, option (B) is correct.
Reasons for the incorrect statements:
Option (A) is given as “Phospholipids are found only in certain membranes”. Phospholipids are present in the membranes, but the proteins present in the membrane are unique, specific and diverse. So, it is the wrong answer.
Option (C) is given as “Only certain membranes of the cell are selectively permeable”. The cell membranes are selectively permeable to the movement of the various solutes like glucose and ions, which cross the membrane across the protein channels. They are unique and specific to the membrane. So, it is a wrong answer.
Option (D) is given as “Only certain membranes are constructed from amphipathic molecules”.
The membrane molecules are amphipathic, but the proteins formed in the membrane are specific and unique. So, it is a wrong answer.
Hence, options (A), (C), and (D) are incorrect.
The proteins present in the membrane are unique, specific and are of various types. These include the cell signaling proteins, growth factor receptor proteins, post-translationally modified proteins, blood group proteins, and cluster of differentiation receptor proteins.
Want to see more full solutions like this?
Chapter 5 Solutions
CAMPBELL BIOLOGY IN FOCUS,AP ED.-ACCESS
Additional Science Textbook Solutions
Campbell Essential Biology (7th Edition)
Study Guide for Campbell Biology
Essentials of Genetics (9th Edition) - Standalone book
Brock Biology of Microorganisms (15th Edition)
Campbell Biology: Concepts & Connections (9th Edition)
Biology: Life on Earth with Physiology (11th Edition)
- What is the main difference between prokaryotic and eukaryotic cells? A. The size of the cells B. Whether or are not they are able to perform cellular respiration C. The type of enzymes that are found in the cell D. Whether or not they have a nucleusarrow_forwardWhich functions are carried out by smooth endoplasmic reticulum? A. Makes phospholipids and stores calcium B. Breaks down cellular wastes and debris via enzymes C. Modifies polypeptides and lipids then sorts and packages the finished products into vesicles D. Folds and modifies proteins and polypeptides via surface ribosomesarrow_forwardWhat is NOT a function of the plasma membrane? a. isolate the cell from its surroundings b. communication with other cells c. catalyze macromolecules into subunits d. structural supportarrow_forward
- Which is NOT found in all cells? a. plasma membrane composed of phospholipids b. ribosomes c. DNA d. mitochondriaarrow_forwardThe tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a. phosphate groups; hydrophobic b. fatty acid groups; hydrophilic c. phosphate groups; hydrophilic d. fatty acid groups; hydrophobicarrow_forwardWhich macromolecule is a primary component of cell walls, and which argument provides evidence for how the structure of this molecule relates to its purpose within the cell wall? A Lipids are the primary component, and they repel and prevent excess uptake of water because they form carbon chains. B Lipids are the primary component, and they protect the cell and help maintain its shape because they form carbon rings. C Carbohydrates are the primary component, and they repel and prevent excess uptake of water because they form carbon chains. D Carbohydrates are the primary component, and they protect the cell and help maintain its shape because they form carbon rings.arrow_forward
- Which statements are consistent with the fluid-mosaic model of membranes? (a) All membrane proteins are bound to the interior of the membrane. (b) Both proteins and lipids undergo transverse (flip-flop) diffusion from the inside to the outside of the membrane. (c) Some proteins and lipids undergo lateral diffusion along the inner or outer surface of the membrane. (d) Carbohydrates are covalently bonded to the outside of the membrane. (e) The term mosaic refers to the arrangement of the lipids alone.arrow_forwardUse the property of particle size to explain the selective-permeability of cell membranes.arrow_forwardA cell that is missing this structure would not be able to transport mRNA or ribosome subunits out of the nucleus. Name the cell structure AND explain why. Then state which type of cell(s) have this structure.arrow_forward
- Which statement is NOT TRUE about lysosomes? a. It contains strong digestive enzymes. b. It is a membranous sac of hydrolytic enzymes in goats and cows. c. The function of digestive enzymes is to breakdown food and waste material within onion cells. d. It can digest all kinds of macromolecules in elephants.arrow_forwardThere are two types of eukaryotic cells. Describe three differences between plant and animal cells?arrow_forwardBased on what you have just learned about the structure and function of cellular membranes, describe how such a cell accomplishes these interactions with its environment.arrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College