Numerous lines of evidence exist, including that
mitochondria and chloroplasts have their own circular DNA (prokaryotes also have circular DNA)
, mitochondria and chloroplasts have a double membrane (the inner membrane would have initially been the ingested prokaryote’s single membrane, and the outer membrane initially …
Where can we find evidence of endosymbiosis?
Abundant evidence has been found for endosymbiosis:
Mitochondria and chloroplasts
are similar in size and morphology to their ancestral bacterial prokaryotic cells, though the mitochondria of some organisms are known to be morphologically variable.
What is the evidence of endosymbiotic theory?
The evidence suggests that
these chloroplast organelles were also once free-living bacteria
. The endosymbiotic event that generated mitochondria must have happened early in the history of eukaryotes, because all eukaryotes have them. … The first eukaryotic cell evolved more than a billion years ago.
What is the evidence for endosymbiosis quizlet?
What evidence exists to support the endosymbiotic origins of eukaryotic cells? The endosymbiotic theory
is based on mitochondria and chloroplasts of eukaryotes
. Both structures have characteristics (such as their own DNA and the ability to self-replicate) of independent prokaryotes.
What is the endosymbiotic theory and what is the evidence behind it?
The endosymbiotic theory
posits that some eukaryotic cell organelles, such as mitochondria and plastids
, evolved from free-living prokaryotes. Available data indicate that the mitochondrial endosymbiosis initiated the evolution of the eukaryotic cell, as suggested by Margulis.
Which of the following is the strongest evidence for endosymbiotic theory?
The strongest piece of evidence for the endosymbiotic theory is the fact that
mitochondria and chloroplasts have their own circular DNA, prokaryote fashion, and can still replicate, transcribe and translate some proteins
. Their ribosomes are also fashioned as a prokaryotes would be.
Is endosymbiotic theory true?
These theories were initially dismissed on the assumption that they did not contain DNA. This was proven false in the 1960s, leading Hans Ris to resurrect the idea. Endosymbiosis is
a debate that has been widely accepted in the molecular biology world
.
Which type of cell has no nucleus?
Prokaryotes
are organisms whose cells lack a nucleus and other organelles. Prokaryotes are divided into two distinct groups: the bacteria and the archaea, which scientists believe have unique evolutionary lineages. Most prokaryotes are small, single-celled organisms that have a relatively simple structure.
What is an Endosymbiotic event?
The original endosymbiotic event that ultimately lead to (almost) all of the organelles we call plastids occurred after the
time
of LECA, and clearly involved a fully developed eukaryotic cell as the host, and a cyanobacterium capable of oxygenic photosynthesis as the symbiont.
What is the Endosymbiotic theory PDF?
The endosymbiotic theory
posits that at least some organelles in
.
eukaryotic cells
, mitochondria and plastids, in particular, evolved. from free-living organisms that were enslaved by other cells.
Which type of evidence does not support the endosymbiotic theory?
“
The exterior structure similar to bacterial cell walls
” IS NOT an evidence in favour of the endosymbiotic theory. Both mitochondria and chloroplasts are double membrane bound.
Which is part of the endosymbiont theory quizlet?
Evolutionary theory which explains the origin of eukaryotes from ancestral prokaryotes. Proposes that
some organelles (Mitochondria and Chloroplasts)
, evolved from free-living prokaryotes that were engulfed and subsequently became obligate endosymbionants.
Which of the following is not evidence of the endosymbiotic theory quizlet?
Which of the following is NOT evidence for the endosymbiosis theory? NOT EVIDENCE:
Mitochondria and chloroplasts have DNA that is similar to that found in the nucleus
.
Why is endosymbiotic theory important?
Endosymbiosis is important because it is
a theory that explains the origin of chloroplast and mitochondria
. It is also a theory that explains how eukaryotic cells came to be.
What are the steps of the endosymbiotic theory?
- Prokaryotic cell membrane folded into cytoplasm.
- Nuclear membrane, endoplasmic recticulum, and golgi body are now independent of external membrane.
- Ancestoral eukaryote engulfed, but did not kill prokaryote.
- The prokaryote survived inside the eukaryote and each evolved a dependence of each other.
Who proposed endosymbiotic theory?
Endosymbiotic theory was repopularized in 1967 by
Lynn Sagan
(later Margulis) [88] and also mentioned in a very curious paper by Goksøyr [89].
