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Biology: The Unity and Diversity o...

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

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 19, Problem 13SQ
Textbook Problem
535 views

The first eukaryotes were _______.

  1. a. fungi
  2. b. plants
  3. c. protists
  4. d. animals

Summary Introduction

Concept introduction: The endosymbiotic theory is the widely accepted theory related to the evolution of the eukaryotes. The theory explains that “The eukaryotes evolved through a process where different types of free-living prokaryotes became incorporated inside larger prokaryotic cells and eventually developed into mitochondria, chloroplasts, and possibly other organelles”.

Explanation of Solution

Reasons for correct statement:

Earlier, the eukaryotic cells have nucleus, endomembrane system, mitochondria, and some have chloroplasts. These single-celled organisms were known as the first members in the eukaryotes, and they are now referred as protists.

Option c. is given as “protists”. As protists were the first group in the eukaryotes, option c. is correct.

Reasons for the incorrect statements:

Option a. is given as “fungi”.

In the late Proterozoic period, fungi were present in the seas. Eukaryotic fungi were observed in the aquatic condition as flagellated cells. So, option a. is incorrect...

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