For each of the following statements that is true, write “true” in the blank. For each statement that is false, write the word(s) that should be substituted for the underlined word(s) to make the statement correct.
__________ When environmental nutrients are depleted, myxobacteria aggregate in mounds to form fruiting bodies..

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.

The prefix photo- indicates that an organism will make use of _______ for energy purposes.

Biologists can divide living organisms into two groups:autotrophs and heterotrophs, which differ in _________.

Organisms that use organic molecules as their source of carbon are called:

Organisms that use CO₂ as their source of carbon are called