why do cells need energy?

Question

and oxygen/food/excretion/water

Answer 1

cells need to perform lots of processes, like photosynthesis (in plant cells), protein synthesis, DNA replication etc. and in order to do these things, they need energy.
A cell's "food" is glucose. The way that the cell can get energy is by breaking down glucose into a type of energy called ATP (and a few other things), and in order to do this, the cell needs oxygen.
The cell needs water because that's what it is largely made up of: the cytoplasm is mostly water.
Some of the things that glucose is broken down into are toxic to the cell, and carbon dioxide is one of them. The cell must excrete these, otherwise it will poison itself.

Answer 2

Cells do not necessarily need oxygen. Some, especially some of the more pathological bacteria, survive and breed more happily in an anaerobic atmosphere. The need for food and water is what defines organic life and that which differentiates it from say a rock or a crystal. Excretion is a means of removing the waste products which would cause the cell harm if not renoved. As for energy, all (bio)chemical and physical actions require energy in some form or another. Without energy, nothing happens.

Answer 3

To carry out all of their functions! Plant cells need light energy to undergo photosynthesis so that they can grow, reproduce and function. Eukaryotic cells use the carbs in food that we eat for proteins like glucose so that the individual parts of the cells can do their jobs. Excretion helps any waste products get out of the cell once they are no longer useful and water is the most important of all! It makes all life on earth possible because of it's very special properties like strong hydrogen bonds that give water high surface tension (so water can be transported from a plants roots to it's leaves) and high heat capacity (so we can maintain normal body temperature)

Answer 4

Because despite it's size, a cell is still a living organism. Which not only requires specific molecules to survive, but also specific molecules to carry out their specific function. Without energy, a cell is not only useless, but it will die.

I hope this helps! Best of Luck!

Answer 5

The core reason is this:

Cells are not from themselves, and everything that isn't of itself is contingent. In Nature all things that are not from themselves always require energy to guarantee their function and self-preservation.


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Answer 6

If music be the food of love, lets dance!!!

So the prisoners don't die, all at tax payers expense may I add, better in than out i always say. ;--D

LIGHTS OUT!!!!!

Answer 7

with out those things they die