Chapter 4, Problem 1SQ

Summary Introduction

Introduction: The plasma membrane, also known as cell membrane is a biological membrane that forms a boundary between a cell’s contents and the outside of the cell. It is a semi-permeable membrane. It functions to protect the cell from its surroundings.

Answer to Problem 1SQ

Correct answer: Genes are not a part of the plasma membrane.

Hence, the correct answer is option d.

Explanation of Solution

Reasons for the correct answer:

The gens are the basic biological unit of heredity. It is a DNA or RNA sequence that codes for a particular molecule that has a specific function. It is mainly located on a chromosome. IT is not a part of plasma membrane.

Option d. is given as “genes”.

The plasma membrane consists of proteins, phospholipids and receptors Genes are not a part of plasma membrane.

Hence, the correct answer is option d.

Reasons for the incorrect answers:

Option a. is given as “proteins”.

The proteins present in plasma membrane is also known as transport membrane proteins. It functions to transport the substances like molecules and ions across the membrane. Proteins are a part of the plasma membrane.

Hence, option a. is incorrect.

Option b. is given as “phospholipids”.

The basic structure of the plasma membrane known as lipid bilayer are formed by the phospholipids. Phospholipids are a part of the plasma membrane.

Hence, option b. is incorrect.

Option c. is given as “receptors”.

The cell-surface receptors are the transmembrane receptors that functions to bind with the external ligand molecules. Receptors are a part of the plasma membrane.

Hence, option c. is incorrect.

Hence the options a., b., and c. are incorrect.

Conclusion

The plasma membrane consists of proteins, phospholipids, and receptors.