Energy and Respiration


autotrophs = organisms that can use inorganic carbon in the form of CO2, to procure their own energy.

heterotrophs = organisms that need a ready-made organic supply of carbon, because they cannot procure energy themselves.

Autrophs

Energy is needed by all living organisms in order to do work. By work we mean:

1. Anabolic Reactions (The synthesis of complex substances from simpler ones)

  • Synthesis of polysaccahrides from monosaccharides
  • Synthesis of lipids from glycerol and fatty acids
  • Synthesis of polypeptides from amino acids
  • Synthesis of nucleic acid from nucleotides

2. Active transport

3. Mechanical Work

  • Muscle contraction
  • Ameobid movement
  • Movement of cilia and flagella
  • Movement of vesicle in the cytoplasm

4. Bioluminescence or electrical discharge in some cases.

Endotherms are organisms that use the thermal energy released (basically recycle it) from metabolic reactions to maintain a constant body temp.

Ectoherms are organisms that use energy from outside their body to heat up.


 

Energy is made available in more ways. For example in aerobic conditions, a very high quantity of energy is released from the complete oxidation of glucose. Because this reaction has a very high activation energy, and the yield is huge, a much more flexible molecule is used: ATP (Adenosine Triphosphate)

equation

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s