Question

scientists believe the first organism to appear on earth were prokaryotic which of the following best represents what the cell sturcture of these organisms may have looked liked is it A. contracile vacuole B.chlorplast C.dna or D. nucleus

Answer 1

Ans. (B). chloroplast.

Prokaryotes are first organisms that appeared on the earth. These organisms lack true nucleus and other membrane -bound organelles. According to the studies, cell structure that resembles these prokaryotic organisms are mitochondria and chloroplasts.

This is because, chloroplasts and mitochondria have their own circular DNA to synthesize enzymes and proteins for cellular functions, double-membrane covering, and ribosomes, all of which are  also present in prokaryotes.

Thus, the correct answer is option (B).

Answer 2

Hi!

The answer is B. chloroplast because prokaryotic cells don't have contractile vacuoles, DNA, or a nucleus. 

Hope this helps!  :))<span />