List the reactants and products of photosynthesis.

Most scientists agree that about two billion years ago, photosynthetic cyanobacteria expanded rapidly and raised the concentration of oxygen in the earth’s atmosphere to present levels in about 500 million years.  This appearance of oxygen and the beginning of aerobic life was made possible by the appearance of

What is thought to be the most abundant enzyme on earth?

Some of the carbon dioxide we exhale is produced in

Which stage of aerobic cellular respiration is responsible for completing the breakdown of glucose all the way to CO2, which is then released as a waste product?

All of the energy harvested during the chemical breakdown of food molecules is not captured and stored as ATP.  What happens to the rest of the energy?

The enzyme that makes ATP in cellular respiration is ____________, while the enzyme that makes ATP in photosynthesis is _________________.

Breathing is related to cellular respiration because when you inhale you breathe in CO2, which is delivered to your cells and is used during cellular respiration.  O2 is a waste product of cellular respiration and is exhaled.

Are the following organisms autotrophs or heterotrophs?

Spermatogenesis occurs in the uterus