Microbiology Fundamentals: A Clinical Approach
Microbiology Fundamentals: A Clinical Approach
3rd Edition
ISBN: 9781259709227
Author: Marjorie Kelly Cowan Professor, Heidi Smith
Publisher: McGraw-Hill Education
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Chapter 4, Problem 1Q

Mitochondria likely originated from

  1. a. archaea.
  2. b. invagination of the cell membrane.
  3. c. bacteria.
  4. d. chloroplasts.
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Summary Introduction

Introduction:

Mitochondria are the powerhouse of the cell which provides energy for all the cellular activities. Mitochondria are bounded by two membranes: the inner and outer membrane. Space between the two membranes is called the intermembrane compartment and space is filled with fluid is called the mitochondrial matrix.

Answer to Problem 1Q

Correct answer:

Mitochondria are believed to have originated from bacteria. Therefore, option (c) is correct.

Option (c) is given as “bacteria”.

Explanation of Solution

Justify the reason for the correct statement:

The bacteria, archaea,and eukaryotes all have evolved from different kind of cells. The precursor of eukaryotes and prokaryotes is known as “Last common ancestor” (LCA). Theory of endosymbiosis explains that a bacterial cell engulfed the descendent cell of LCA (pre eukaryotic) and became the permanent part of LCA cell serving as mitochondria. Later with time, this association gave rise to the formation of the first eukaryotic cell.

Hence, option (c) is correct.

Justify the reasons for the incorrect statements:

Option (a) is given as “archaea”.

Mitochondria did not originate from archaea. Archaea, bacteria and pre eukaryotic cells developed from the last common ancestor way before mitochondria were formed. Hence, it is a wrong answer.

Option (b) is given as “invagination of the cell membrane”.

Mitochondria did not originate from invagination of membranes. Mitochondria originated from association of pre eukaryotic and bacterial cell. Hence, it is a wrong answer.

Option (d) is given as “chloroplasts”.

Chloroplast and mitochondria are believed to have evolved by the endosymbiosis. The theory of endosymbiosis explains that some of the eukaryotic cell organelles were generated by the symbiosis between pre eukaryotic and bacterial cells. Hence, it is a wrong answer.

Hence, options (a),(b), and(d) are incorrect.

Conclusion

Mitochondria is likely to have originated from the bacterial cell association with the pre eukaryotic cell.

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Students have asked these similar questions
Which of the following statements supports the concept of the endosymbiotic theory? A. Proteins may be trafficked within the endomembrane system. B. Ribosomes are present in the cytoplasm of prokaryotic cells and eukaryotic cells. C. Chloroplasts have many features in common with bacteria. D. Mitochondria can fuse together to form larger organelles within eukaryotic cells.
Which of the following is not a characteristic that chloroplasts and mitochondria share?   A. They are both believed to originally be Eubacteria   B. They are both double-membrane structures.   C. They are capable of reproducing themselves.   D. They are both part of the endoplasmic membrane system.   E. They both have their own DNA.
Which of the following statements is False?a. Photosynthesis occurs in plastids.b. Chloroplasts extract energy from food storagemolecules.c. Mitochondria likely originated from prokaryotic cells.d. Plant cell walls are a type of extracellular matrix.

Chapter 4 Solutions

Microbiology Fundamentals: A Clinical Approach

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