Biology: The Unity and Diversity o...

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



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 19, Problem 11SQ
Textbook Problem

The host cell in the endosymbiosis that produced the first chloroplasts was a(n) ______.

  1. a. early eukaryote
  2. b. archaeon
  3. c. aerobic bacterium
  4. d. alga

Summary Introduction

Concept introduction: Endosymbiosis refers to a relationship in which one organism lives inside another. Early eukaryotic cells had the nucleus, endomembrane system, mitochondria, and the chloroplast in some species. The endosymbiont hypothesis states that mitochondria and chloroplasts evolved from the bacteria.

Explanation of Solution

Reasons for the correct statement:

Chloroplasts first arose through the endosymbiosis between a host eukaryote and cyanobacteria. Cyanobacteria live inside the host cell and are the only bacteria that carry out photosynthesis like chloroplasts do.

Option a. is given as “early eukaryote”.

As in the endosymbiosis, early eukaryotes were used as the host cell to produce chloroplast. Thus, option a. is correct.

Reasons for the incorrect statements:

Option b. is given as “archaeon”.

Mitochondria have evolved from aerobic bacteria that entered and lived inside the host archaeon...

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