Plant Cell Wall Components

Questions and Answers

What is the innermost portion of a mature plant cell wall composed of?

External protein

Integral protein

Secondary cell wall

Primary cell wall (correct)

What are the main components of the hemicellulose in plant cell walls?

Pectins and proteins (correct)

Galactans and lipids

Cellulose and galactans

Hemicellulose and pectins

What is the function of plasmodesmata in plant cell walls?

To facilitate cell-to-cell communication (correct)

To synthesize proteins

To provide structural support

To store nutrients

What is the characteristic of cell membranes according to the fluid mosaic model?

Quasifluid nature Signup and view all the answers

What is the relationship between the cell wall and middle lamella in plant cells?

They are traversed by plasmodesmata Signup and view all the answers

What is NOT a component of the endomembranous system in eukaryotic cells?

Plasma membrane Signup and view all the answers

What is the main difference between the structural and functional aspects of the cell membrane?

Their structures are distinct Signup and view all the answers

Which of the following cellular processes is NOT explained by the fluid nature of the cell membrane?

mitochondrial function Signup and view all the answers

What is the main function of the Golgi apparatus in the cell?

protein modification and routing Signup and view all the answers

What is the primary function of the cell wall in plant cells?

To provide protection and support Signup and view all the answers

What does 'B' represent in the figure of the Golgi apparatus?

Cisternae Signup and view all the answers

Which of the following components is NOT a part of the cell wall of plant cells?

Peptidoglycan Signup and view all the answers

Which organelle is NOT involved in the synthesis, modification, and routing of proteins?

Chloroplast Signup and view all the answers

What is the main component of the cell wall of fungal cells?

Chitin Signup and view all the answers

Which of the following is NOT a function of the cell wall of plant cells?

Synthesizes cellular products Signup and view all the answers

What is the primary function of the cell membrane in terms of permeation of substances?

to regulate the flow of specific substances Signup and view all the answers

What is the component labelled as A in the diagram of the cell membrane?

Cell wall Signup and view all the answers

Which of the following cell wall components provides a barrier to undesirable macromolecules?

Cell wall as a whole Signup and view all the answers

Study Notes

Cell Wall Composition

The innermost portion of a mature plant cell wall possesses hemicellulose.
Cell walls of most fungi primarily consist of chitin.

Cell Membrane Structure

The fluid mosaic model explains the structural and functional aspects of cell membranes.
Cell membranes are not solid or solidified sheath, but quasifluid.
Cell membranes provide stability, facilitate communication with other cells, and enable secretion.

Cell Wall Functions

The cell wall of plant cells provides protection, helps in cell-to-cell interaction, and acts as a barrier to undesirable macromolecules.

Endomembranous System

Endoplasmic reticulum, Golgi body, lysosome, and vacuoles are components of the endomembranous system because their structures are distinct, functions are distinct, and their functions are coordinated.

Intercellular Connections

Plasmodesmata are tiny channels that traverse the cell wall and middle lamellae, allowing for direct communication between adjacent plant cells.

Protein Modification and Routing

The endoplasmic reticulum is the main organelle involved in the modification and routing of newly synthesised proteins to their destination.

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Description

This quiz tests your knowledge of the components that make up a plant cell wall, including cellulose, galactans, pectins, and more. Identify the correct component of a mature plant cell wall.