Question

Consider the following statements about prokaryotic and eukaryotic cells:
Statement I: Some prokaryotes evolved into mitochondria and plastids in the bodies of ancestral eukaryotes.
Statement II: The endomembrane system of eukaryotes might have evolved by infolding of the plasma membrane.
Which of the following is correct?

• A. Both the statements I and II are true.
• B. Both the statements I and II are false.
• C. Statement I is true, but II is false.
• D. Statement I is false, but II is true.

Hint:

Remember, the endosymbiotic theory is a cornerstone in understanding the evolution of complex cells from simpler ancestors, a fundamental concept in evolutionary biology.

Answer 1

The Correct Option is A

Step 1: Analyzing Statement I. Statement I refers to the endosymbiotic theory, which suggests that some prokaryotes evolved into mitochondria and plastids by being ingested by a larger cell and then establishing a symbiotic relationship inside the host, contributing to the evolution of complex eukaryotes. This theory is widely accepted in biology. 
Step 2: Analyzing Statement II. Statement II discusses the origin of the endomembrane system in eukaryotic cells, which is theorized to have evolved through the infolding of the plasma membrane. This process would compartmentalize the cell, allowing for more complex cellular functions. This is a credible theory supported by cellular biology.

So, the correct answer is (A): Both the statements I and II are true.