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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

Solutions

Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 19, Problem 10SQ
Textbook Problem
181 views

Infoldings of the plasma membrane into the cytoplasm of some ancestral cells may have evolved into the _______.

  1. a. nuclear envelope
  2. b. ER membranes
  3. c. primary cell wall
  4. d. both a and b

Summary Introduction

Concept introduction: An important feature in the eukaryotic cell is their nucleus. The nucleus formation has begun in the archeal ancestor of the eukaryotes when the portions of the plasma membrane have folded inward.

Explanation of Solution

Reason for correct answer:

When the plasma membrane folds inward, some of their internal membranes surround the DNA, thus forming the nuclear membrane. The other portions of the internal membrane give rise to additional components of the endomembrane system.

The infoldings of the plasma membrane into the cytoplasm in some ancestral cells have evolved into the nuclear envelope and the ER membrane. Hence, option d. is correct.

Reasons for the incorrect answers:

Option a. is given as “nuclear envelope”.

The internal membrane of the nuclear envelope and ER membrane has evolved together from the infoldings of the plasma membrane...

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