What makes endocytosis and exocytosis active transport mechanisms?
1) they happen through simple diffusion.
2)they involve taking a large molecule into the cell.
3) they require energy to change the cell membrane.
4) they involve the passage of molecules across the cell membrane.

What is the name for a substance formed in a chemical reaction

3points hurry! what is the relationship between biotechnology, sharkskin, and disease resistance? bioengineers have developed an artificial sharkskin that does not allow resistant bacteria to grow on it. disease-causing microbes have been genetically modified to keep them from infecting the skins of sharks. scientists have created a device that can be attached to the skins of sharks that dramatically increases their abilities to resist disease. sharkskin produces many chemicals that can be collected and used to create antibiotics.

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.