Energy transformations

[Stick]

I don't get why the answer is B to the following question.

[Bad Student]

B and C both seem correct to me.

[Yacoubb]

I don't get why the answer is B to the following question.

I've also done this question and I answered B initially, and it was my first instinct. The radiant energy of sunlight is converted to chemical energy stored in sugars by leaf cells, which are photosynthetic cells with chloroplasts, the site of photosynthesis.

C would probably be wrong for one reason; ATP is the mechanical energy used by heart muscle cells and so there is no conversion of energy, and rather just expenditure of the energy in the form of ATP. Therefore, there is no energy conversion here + so it isn't a valid answer.

B is therefore the answer - my opinion, could be wrong however.

[Stick]

I dont think ATP can be a mechanical form of energy. It's a molecule.

[Yacoubb]

I dont think ATP can be a mechanical form of energy. It's a molecule.

Okay well is ATP transformed into mechanical energy, or is ATP expended in endergonic processes like active transport or anabolism of molecules in enzyme catalytic reactions? That's why I think B is the right answer.

[the girl at the rock show]

If I was tossing up between B and C in an exam, I'd go with B because I know it's definitely right. One of the first things that you learn about photosynthesis is that it's a conversion from radiant energy (sunlight) into chemical energy (glucose).

I'm not really sure what defines 'chemical' and 'mechanical' energy, but I'm pretty sure that there's no conversion between the two in C. Your heart muscles need energy in order to contract. To get this energy, your cells break down ATP into ADP and Pi, releasing some energy. This isn't a conversion of energy, this deals with chemical energy only.

For example, breaking the bonds in starch in order to make glucose would release energy, but you wouldn't say that that's a conversion of chemical to mechanical energy.