Question

Is the answer D? Thank you

The earliest atmosphere of Earth is not believed to have contained oxygen. Which cellular component would not have been useful at that time?
A) chloroplast
B) nucleus
C) plasma membrane
D) mitochondrion

Answer 1

I'll give you a hint. Plasma membrane and nucleus are incorrect but either mitochondrion or chloroplast are correct, one of them carries out photosynthesis which produces oxygen and glucose and uses carbon dioxide, the other carries out cellular respiration which produces carbon dioxide and uses oxygen and glucose (carbon dioxide was already very plentiful in the early atmosphere so the one involved with photosynthesis is the correct answer)

Answer 2

Thank you so much for replying, so the answer is chloroplasts?

Answer 3

Unless my Biology teacher lied to me that should be right.

Answer 4

Actually I read you question wrong, the correct one is mitochondrion, sorry

Answer 5

yeh those are the two i narrowed it down to. You are very helpful though can I just ask you 1 more please. I think it's choice C, but I don't know really. Thank you!

Organisms that maintain a constant body temperature rely on the heat produced by cells. Where does this heat come from?

A) Special metabolic pathways exist just for the production of heat.
B) Mitochondria produce heat in the form of ATP.
C) Plants store up heat as they perform photosynthesis. When an organism digests a plant, that heat is released.
D) Heat is a natural by-product of most chemical reactions.

Answer 6

i meant to say just "one" more

Answer 7

Sorry I responded so late, I had a class tonight. I'm not 100% sure on this one. C is partially correct because organisms do release heat after digesting plants and other materials but the heat does not come from photosynthesis, instead the origional energy for all energy in plants and animals comes directly from the sun by first enableing the plant to photosynthesize and produce glucose and oxygen then when the plant is digested by an organism, the glucose is used as energy which is released as heat. I think that is what answer c is trying to show just a shorter explanation of that, it is the only one that really has any context to the subject.

Answer 8

C FOR SURE