Jayne's science class is doing a laboratory investigation on cells. Her teacher gives them each a cotton swab to collect cheek cells from their mouths. They then smear the cheek cells onto a glass slide and look at the cells under a microscope.

What can Jayne expect all of her cheek cells to contain?
A.
a cell wall
B.
a nucleus
C.
a chloroplast
D.
all of these