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

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)

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

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

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

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.

i meant to say just "one" more

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.

C FOR SURE

To determine which cellular component would not have been useful in the earliest atmosphere of Earth, let's analyze the function of each option:

A) Chloroplast: Chloroplasts are responsible for photosynthesis, which converts sunlight into energy for the cell. However, the earliest atmosphere lacked oxygen, which is necessary for photosynthesis. Therefore, chloroplasts would not have been useful at that time.

B) Nucleus: The nucleus contains the genetic material and coordinates cell activities. It is essential for the functioning of eukaryotic cells. While the earliest atmosphere lacked oxygen, the absence of oxygen would not directly affect the nucleus's function. Therefore, the nucleus would still be useful at that time.

C) Plasma membrane: The plasma membrane maintains the integrity of the cell and regulates the movement of substances in and out of the cell. It acts as a selectively permeable barrier. The absence of oxygen in the atmosphere would not impact the functionality of the plasma membrane, as its primary role is to control the movement of molecules rather than oxygen itself. Therefore, the plasma membrane would still be useful at that time.

D) Mitochondrion: Mitochondria are responsible for producing energy through cellular respiration, a process that requires oxygen. As the earliest atmosphere lacked oxygen, the mitochondria would not have been useful in generating energy during this time.

Considering the analysis, the component that would not have been useful in the earliest atmosphere of Earth is D) mitochondrion.