Question 36Biological membranes:A Are plasma membranes;B Are impermeable;C Are, such as micelles, lipid bilayers;D Are lipid bilayers with associated mem-brane proteins.E Do shape the cell;

Cell It is defined as the simplest, smallest, and essential unit of life. All the life processes…

Answered: |A Are plasma membranes; B Are…

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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Step 1Introduction

Cell

It is defined as the simplest, smallest, and essential unit of life.
All the life processes are occurring inside the cell.
It consists of various compartments known as organelles and is assigned to perform a particular function.
A group of cells performing the same function forms tissue and further group of tissues forms an organ. different organs unite together to form a particular system that performs a defined function in the body.
Various cell organelles are mitochondria, lysosomes, endoplasmic reticulum, nucleus, Golgi bodies. All organelles and cells are surrounded by layers or covering called membranes.

Step 2 Answer Biological membranes are

a) Plasma membranes

False
Biological membranes are membranes surrounding the cell whereas plasma membranes are membranes surrounding the cell organelles
A biological membrane separates the cell from its exterior environment whereas plasma membranes separate the cell organelle and cytosol.

b) impermeable

False
Biological membranes are selectively permeable that allows the passage of ions, molecules through diffusion or ion channels, or proteins present in membranes.
It is not impermeable

c) are micelles, lipid bilayers

False
They are not micelles as micelles comprise of the single lipid layer
biological membranes consist of lipid bilayers.

d) Lipid bilayer with associated membrane proteins

This is true
Biomembrane is comprised of two layers of lipids one facing the exterior of the cell and another facing interior of the cell.
The polar heads of lipids are facing outward and non-polar tails facing inside.
Different types of proteins are found in lipid bilayer which helps in the passage of ions, molecules across the membrane.
Some proteins are peripheral proteins that are present on the periphery of the cell membrane but tightly held with lipid molecules. while others are transmembrane proteins that span number of times in a membrane.

e) Shape the cell.

It is false
It mainly separates the cell from the outer environment and helps in the passage of ions to and from the cell.

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