Why are plant leaves green?

We often say that we need food for energy. In a biological sense, is this correct?

In lab, Ahmed separated spinach leaf pigments. Study his results in the diagram below. What is the Rf value for carotene?     

We set up an experiment where the same species of plant is grown in boxes covered with plastic that only allows in certain colors of light. In which box would we expect the least plant growth and even perhaps the death of the plant? (Hint: think of the colors that are absorbed and reflected)

If an enzymatic reaction was controlled by feedback inhibition, we would expect it to stop

While eating a portion of yogurt, you have to leave, so you store the yogurt in the refrigerator. A day later you return and find the surface of the yogurt is no longer smooth but has broken into several liquified products. You correctly guess that enzymes from your saliva, via the spoon, have continued digesting the yogurt in your absence. What will happen over time?

In cellular respiration, what is the relationship between the energy content of the reactants (glucose and O2) and products (CO2 and H2O)?

Which statement is true when NAD+ becomes NADH?

We set up an experiment where the same species of plant is grown in boxes covered with plastic that only allows in certain colors of light. In which box would we expect the least plant growth and even perhaps the death of the plant? (Hint: think of the colors that are absorbed and reflected)

Muscles undergo fermentation when