A scientist isolates a disease-causing particle. Which of the following properties would indicate that the particle is a virus and not a bacterium?

Which of the following statements about archaea and bacteria is true? a. neither is single-celled. b. they both have nuclear membranes. c. neither reproduces by binary fission. d. they both lack a nuclear membrane.

When plants use sunlight to make food, the energy of sunlight is

How does the carbon cycle involve an exchange of carbon