Question

Which of the following properties of chloroplasts and mitochondria does not provide support for the endosymbiont theory that present-day eukaryotic cells are descendants of a successful symbiotic relationship between a host cell and an engulfed prokaryote?

They have a double membrane that resembles that of some ancient prokaryotic cells.

They have their own DNA and also replicate in a manner similar to some bacteria cells.

Their inner membranes contain the same enzymes as prokaryotic plasma membranes.

They are able to produce ATP molecules to help power metabolic processes

Answer 1

The hypothesized process by which prokaryotes gave rise to the first eukaryotic cells is known as endosymbiosis, and certainly ranks among the most important evolutionary events. Endosymbiotic theory, that attempts to explain the origins of eukaryotic cell organelles such as mitochondria in animals and fungi and chloroplasts in plants was greatly advanced by the seminal work of biologist Lynn Margulis in the 1960s. Mitochondria are one of the many different types of organelles in the cells of all eukaryotes. In general, they are considered to have originated from proteobacteria (likely Rickettsiales) through endosymbiosis. Chloroplasts are one of the many different types of organelles in the plant cell. In general, they are considered to have originated from cyanobacteria through endosymbiosis. Endosymbiosis has gained ever more acceptance in the last half century, especially with the relatively recent advent of sequencing technologies. There are many variants to the theory, regarding what organism(s) engulfed what other organism(s), as well as how many times and when it occurred across geological time. The biology is messy, and there are many competing theories, so here we tend to converge them in a unified conceptualization [for more detailed treatment, visit the "Origins of the Eukara" pages at Palaeos].

Answer 2

sorry it's very long.

Answer 3

i'm confused ): ....

Answer 4

well............ IDK what to say.
Okay I think I'll give it my best shot!
I think it will be B!

Answer 5

BTW, I like your profile pic, what is it?

Answer 6

my profile pic is from facebook. night club game. i made a character and then i took a headshoot pic. you probably can't get the raindeer head piece

Answer 7

thanks

Answer 8

cool

Answer 9

Let me know if you need help. i'll be very glad. :D

Answer 10

wait i have another question The evolution from vesicles to true cells was best facilitated by the development of

a membrane separating the cell from its environment

organic molecules, such as carbohydrates and lipids

self-replicating molecules, such as RNA and DNA

inorganic molecules, such as nitrogen and oxygen

Answer 11

I think i'll have to say A, because it mainly uses a membrane separating the cell from its enviorment. B could also be a good answer because it also uses organic compounds such as lipids and carbs in this evolution. Hope that helps.

Answer 12

okay thanks. p.s. i like your picture too

Answer 13

thanks. :D

Answer 14

your welcome :D

Answer 15

;D

Answer 16

haha :D what do you do for a living?

Answer 17

well, I like to study, play games, and have fun outdoors.
I mainly like to write stories.
http://www.fanfiction.net/s/8700464/1/Olympian-Bladers-Metal-Masters-Episode-1

Answer 18

cool! how often are you on here andi just came across a question and could you not make it so long!
Explain the roles that hot clay and vesicles may have played in the origin of life on Earth and describe evidence that supports this hypothesis.

Answer 19

okay!

Answer 20

The hypotheses about the origins of life may be divided into several categories. Most approaches investigate how self-replicating molecules or their components came into existence. For example, the Miller–Urey experiment and similar experiments demonstrated that most amino acids, often called "the building blocks of life", were shown to be racemically synthesized in conditions similar to those of the early Earth. Several mechanisms have been investigated, including lighting and radiation. Other approaches ("metabolism first" hypotheses) focus on understanding how catalysis in chemical systems in the early Earth might have provided the precursor molecules necessary for self-replication.

Answer 21

im sorry its long.

Answer 22

ill live i'm gona try my best to shorten it and add in what i can remeber. :)

Answer 23

okay!
P.S= can I become friends with you on Facebook?

Answer 24

i don't really ever use it but sure! i guess..

Answer 25

cool!

Answer 26

i gotts head out.. i need to go. buy

Answer 27

bye oops

Answer 28

Never mind.

Answer 29

never mind what?

Answer 30

crap!!

Answer 31

????????/

Answer 32

what happned?