All cells have all of the following except ()
A. plasma membrane
B. genetic material
C. cytoplasm
D. cell wall
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Ribosomal RNAs are manufactured in which specific area of a eukaryotic cell? ()
A. The nucleus
B. The cytoplasm
C. The nucleolus
D. The chromatin
The current theory of the structure of the plasma membrane is best described by the _______model. ()
A. sandwich
B. fluid-mosaic
C. unit membrane
D. electrochemical
In a phospholipid bilayer, the ()
A. phosphate groups are hydrophobic.
B. proteins are located only between the two layers.
C. fatty acid tails are hydrophilic.
D. phosphate heads are oriented toward the exterior of the cell or toward the cytoplasm.
Molecules in the cell membrane that function as carriers are ()
A. proteins
B. glycerol
C. cholesterol
D. Phospholipids
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