Question

Why are energy carriers thought of as either "full" or "empty"?

Short answer

As a result, energy carriers either carry energy or do not; there is no in-between state, which is why they are either empty (no energy) or filled (energy) (carrying energy).

Step-by-step solution

step-1: Definition

Energy carriers, such as ATP, NADP, NADPH, are molecules that store and transport energy from one place to another in living organisms.

step-2: Introduction

One of these kinds i.e. ATP, NADP, NADPH etc.,is used to store the energy created or captured by a living creature. When the organisms demand energy, these molecules are broken down to provide energy.

step-3: Explanation

Energy carriers are either full or empty, meaning they either carry or do not transport energy. NADP+ and ADP, for example, have no energy and are empty. When the photosystems are full, they catch the sun's energy and store it as NADPH and ATP. In the dark reaction and hydrolysis, NADPH and ATP release energy to create NADP+ and ADP, which are subsequently transmitted to the thylakoids to carry more energy. Either it transports energy or it does not transport anything at all.