Why are genetically engineered mammalian cells sometimes needed to produce certain proteins instead of genetically engineered bacteria? A. Mammalian cells are not needed; bacterial cells can produce the same proteins as long as they have the gene that codes for it. B. Mammal cells have more precise restriction enzymes. C. Mammal cells are larger and can produce greater volumes of protein. D. Bacteria make proteins differently than mammals, and cannot make certain human proteins.

C

Explanation:

Mammals cells are larger and can produce greater volumes of protein than the bacteria, because they have genetically modified Ribosomes which bacteria doesn't have.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.

the elements of art are the visual tools that the artist uses to create a composition. these are line, shape, color, value, form, texture, and space.

the principles of art and design are balance, contrast, emphasis, movement, pattern, rhythm, and unity/variety.