What is not a required characteristic of all living things A. They require and energy source

B. Made up of 1 or more cells

C. They maintain stable internal conditions

D. They respond to changes in the enviroment

What are the four basic classes of organic molecules how do they differ structurally and functionally

Which description provides the best objective summary of the article in the passage?

Which of the following will a bacterium produce when a human gene is added to its genome? question 4 options: human carbohydrates a protein made up of both human and bacterial properties the human protein coded for by the human gene human plasmids that can be isolated from the bacterium