What is the mutation caused by the addition of a nucleotide to an already existing gene sequence called?

A. deletion

B. duplication

C. insertion

D. inversion

Common commercial benefits of microorganisms include synthesis ofa. insulin. b. antibiotics. c. aspirin. d. antibiotics and aspirin. e. antibiotics and insulin.

Which of the following does not describe a physical property of iron? a iron is silvery-white or gray in color. b iron has a boiling point of about 3,000°c. c iron is a magnetic element . d iron and sulfur react to form iron sulfide.

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these