Which of the following is hypothesized to be the early source of free oxygen in Earth's atmosphere? A. photosynthesis by cyanobacteria B. ionization of water molecules C. respiration of fish D. decay of animal remains

Organisms that break down molecules to generate energy are prokaryotes or eukaryotes

Which of the following groups is a population?

Nutrients deposited on leaves as dust and materials leached from leaves through insect action are most often transported to the forest floor by

What does sexual reproduction and asexual reproduction have in common?

Bacteriophages infect A) other viruses B) bacteria C) any available host cell D) Cells undergoing the lytic cycle

The Hershey and Chase experiments involved the preparation of two different types of radioactively labeled phage. Which of the following best explains why two preparations were required? A. The bacteriophage used in the experiments was a T2 phage. B.

What is the definition of RNA?

Subduction is not always accompanied by compression and thrust faulting in the overriding plate. this is especially true when:

What stores energy serves as a steroid and makes up much of the cell membrane?

All's life is based on the chemical element