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Both active transport and facilitated transport utilize specific ______________ proteins embedded in the cell membrane.

Liver cells secrete most blood proteins. What organelle is particularly abundant in liver cells?

While water continually orients phospholipids into a lipid bilayer, it does not fix the lipids permanently into position. Thus, the bilayer is considered to be _______ in nature.

Which of the following is NOT a distinguishing characteristic of prokaryotic cells?

The delivery system of eukaryotic cells called the ______ can collect, package, modify, and transport molecules.

In eukaryotes, mitochondria are the organelles primarily involved in

Small cells function more effectively, because as cells become larger their surface area to volume ratio

Osmosis occurs as water can cross the lipid bilayer through __________________, specialized channels for water movement.

All _____ contain a plasma membrane.

___________ are important in respiration, while chloroplasts are involved in photosynthesis.