Cellular energy - how organisms obtain energy

8 important questions on Cellular energy - how organisms obtain energy

What is cellular respiration?

Cellular respiration is a series of reactions that break down organic molecules into carbon dioxide, water, and energy. The energy is used by the cell.

What do the processes of cellular respiration and photosynthesis form?

The processes of cellular respiration and photosynthesis form a cycle.

What is the most important biological molecule for energy?

The most important biological molecule is adenosine triphosphate, or ATP.
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How does ATP store energy?

ATP releases energy when the bond between the second and third phosphate groups is broken, forming a molecule called adenosine diphosphate (ADP).

What are the two metabolic pathways?

There are two types of metabolic pathways: catabolic (ka tuh BAH lik) pathways and anabolic (a nuh BAH lik) pathways. In catabolic pathways, energy is released by breaking larger molecules into smaller molecules. In anabolic pathways, the energy released by catabolic pathways is used to build larger molecules from smaller molecules.

What does the first law of thermodynamics state?

The first law states that energy can change form, but it cannot be created or destroyed.

What does the second law of thermodynamics state?

The second law states that systems change from states of order to states of disorder on their own.

How do autotrophs obtain energy from the Sun?

Some autotrophs use inorganic substances as a source of energy. Other autotrophs change light energy from the Sun into chemical energy.

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