00:02
Okay, so the question is asking which of the following molecules is used for energy within a cell.
00:09
And we'll actually start by defining each of these different molecules.
00:15
So we'll begin at the bottom.
00:17
Adenosine is a nucleoside that when you combine it with inorganic phosphate groups can become a nucleotide.
00:25
These remaining three are actually each different nucleotides themselves.
00:30
And the difference between each of them is how many phosphate groups they have attached to it.
00:35
So this top one is adenosine trifosate, meaning it has three phosphate groups attached to that adenosine.
00:43
And similarly, the adenosine diphosphate has two phosphate groups, and adenosine monophosphate, or anp, has only one.
00:53
Let's also then consider how energy is created within a cell.
00:58
So the way that happens is actually by breaking those bonds within a nucleotide between an endenazine and a phosphate group.
01:08
So we can consider that since you need those bonds in order to create energy, adenosine alone would not be able to create energy as it does not have any bonds with phosphate groups to begin with.
01:27
So we can cross that one off as a possible answer.
01:33
Then, to determine which of the remaining three would possibly be the main contributor for energy, we can think about the cycle between atp and adp and how they interplay with each other.
01:50
So if you start with an atp molecule and take one of the phosphate, groups off, you will end up with an adp molecule...