The key points of the theory of Endosymbiont’s origin for mitochondria and chloroplasts. Introduction: According to the Endosymbiotic theory, there is a symbiotic relationship between the mitochondria and plastids with the eukaryotic cells. It is said that they were formed after they were eaten by the eukaryotes. Mitochondria and plastids have their own circular DNA (deoxyribonucleic acid), have sizes almost equal to bacteria, composition of their inner cell membrane also matches that of the bacterial plasma membrane, and have similar ribosomes to that of bacterial cells.

Question

The theory of the endosymbiotic origin of mitochondria and chloroplasts was first proposed by the biologist Lynn Which of the following statements provides support for the theory of endosymbiosis? 1. All the genes found in chloroplasts are homologous to genes found in the nucleus of eukaryotic cell. 2. Mitochondria contain their own ribosomes. 3. Proteins need a targeting sequence to be imported into a chloroplast. 4. Mitochondria can generate a proton gradient and harness it to synthesize ATP. O A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1, 2, 3 and 4 are correct.

Answer 1

Question

Chapter 25.3, Problem 1SB

Summary Introduction

To review:

The key points of the theory of Endosymbiont’s origin for mitochondria and chloroplasts.

Introduction:

According to the Endosymbiotic theory, there is a symbiotic relationship between the mitochondria and plastids with the eukaryotic cells. It is said that they were formed after they were eaten by the eukaryotes. Mitochondria and plastids have their own circular DNA (deoxyribonucleic acid), have sizes almost equal to bacteria, composition of their inner cell membrane also matches that of the bacterial plasma membrane, and have similar ribosomes to that of bacterial cells.

Expert Solution & Answer

Trending nowThis is a popular solution!

See solution

Check out sample textbook solution

Students have asked these similar questions

The theory of the endosymbiotic origin of mitochondria and chloroplasts was first proposed by the biologist Lynn Which of the following statements provides support for the theory of endosymbiosis? 1. All the genes found in chloroplasts are homologous to genes found in the nucleus of eukaryotic cell. 2. Mitochondria contain their own ribosomes. 3. Proteins need a targeting sequence to be imported into a chloroplast. 4. Mitochondria can generate a proton gradient and harness it to synthesize ATP. O A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1, 2, 3 and 4 are correct.

Explain the endosymbiont hypothesis for the origin ofchloroplasts and mitochondria.

A scientist discovered a new group of unicellular organisms that lack mitochondria but possess an organelle related to the endoplasmic reticulum and is involved in energy production. The scientist hypothesizes that this organelle might be a missing link in the evolution of mitochondria. A) Do you agree with this hypothesis? Explain. B) Based on the available evidence, what is the most likely hypothesis for the origin of mitochondria? Provide four pieces of evidence to support this theory and justify why they are valid.