Organisms that use CO₂ as their source of carbon are called

Cyanobacteria are a group of photosynthetic bacteria. These bacteria use sunlight as their energy source and carbon dioxide as their carbon source. Cyanobacteria are ________________.

Humans are:

Nitrogen and phosphorus added to beaches following an oil spill encourage the growth of natural oil-degrading bacteria. Explain why the bacteria do not grow if nitrogen and phosphorus are not added.

Which of the following is not a growth factor for various microbes?

a. Cholesterol

b. Water

c. Vitamins

d. Heme

In a defined medium:

a. The exact chemical composition of the medium is known

b. Agar is available for microbial nutrition

c. Blood may be included

d. Organic chemicals are excluded

All cells recycle the essential element ___________ from amino acids and nucleotides.

___________ are small organic molecules that are required in minute amounts for metabolism.