A) electron beams have more energy than light beams.
B) electron microscopes focus light with magnets.
C) electron microscopes have more resolving power than light microscopes.
D) electrons have such high energy that they pass through biological samples.
E) living cells can be observed under the electron microscope.

A) spherical cell with a diameter of 7 $\mu$ m
B) flattened cell of the same volume
C) spherical cell with a diameter of 15 $\mu$ m
D) cuboidal cell of the same volume
E) None of the above;all cells exchange substances and waste products with the environment at the same rate,irrespective of size and shape.

A) remains constant throughout the life of the cell.
B) increases if the cell grows larger without changing shape.
C) decreases if the cell changes from a cuboidal to flattened shape.
D) is larger in a large cuboidal-shaped cell than in a small cuboidal-shaped cell.
E) increases if the cell develops folds in its cell membrane.