Before the development of photosynthesis and as ancient cells became crowded, there was probably a major competition for:

A) enzymes. B) water. C) oxygen gas. D) organic molecules.


Answer: D

Biology & Microbiology

You might also like to view...

In the intestinal tract, Entamoeba histolytica

A. lives as a commensal in the lumen of the intestine. B. can invade the host tissue. C. can undergo excystation in the small intestine. D. All of the choices are correct.

Biology & Microbiology

Which of the following is/are false?

What will be an ideal response?

Biology & Microbiology

Which of the following is the most common form of transmission for impetigo?

A. Mechanical vectors B. Direct contact C. Body fluids D. Fomites E. Blood

Biology & Microbiology

Write an explanation for why a bacteriophage, a virus that infects bacterial cells, would be a good cloning vector

What will be an ideal response?

Biology & Microbiology