One the scale of the CPK models used in class, i.e. magnification of 10^8, an average amino acid (say, Alanine) would be about the size of a

One the scale of the CPK models used in class, i.e. magnification of 10^8, an average amino acid (say, Alanine) would be about the size of a 




A. a house
B. a truck
C. a pillow
D. an apple
E. a marble


Answer: D