
Concept explainers
Mitochondria likely originated from
- a. archaea.
- b. invagination of the cell membrane.
- c. bacteria.
- d. chloroplasts.

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.
Mitochondria is likely to have originated from the bacterial cell association with the pre eukaryotic cell.
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Chapter 4 Solutions
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