题目内容

The predominant components of the lipid bilayer in biomembranes are ()

A. Lipoproteins
B. Glycolipids
C. Phospholipids
D. Glycerols

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Which cellular component can NOT be seen with the light compound microscope? ()

A. DNA
B. cell wall
C. nucleus
D. cytoplasm

Which of these organelles is NOT associated with the production of proteins in a cell?()

A. Ribosomes
B. .Smooth endoplasmic reticulum (SER)
C. .Rough endoplasmic reticulum (RER)
D. .Golgi apparatus

Whether a molecule can cross the plasma membrane depends upon ()

A. the size of the molecule
B. the shape of the molecule
C. the chemical properties of the molecule
D. all of the above

The sodium-potassium pump moves sodium and potassium ions across the plasma membrane by ()

A. facilitated transport
B. active transport
C. cotransport
D. endocytosis

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