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Facilitated diffusion requires energy and can transport molecules against a concentration gradient.

Proteins are __________ built from __________ different amino acids.01_20_2015_CS-3282

Water flows through a selectively permeable membrane in a process called __________, but water molecules cross the membrane more easily through channels of transmembrane proteins called __________.

What is the study of the structure at E called?

If a cell doubled in diameter, it would have twice as much cytoplasm to maintain.

The plasma membrane of cells lining the small intestine has __________, which are specialized for absorption of nutrients.

Which of these molecules is hydrophobic?

Which of these is the best imaging technique for routinely examining the anatomical development of a fetus?

Proteins that do not protrude into the phospholipid bilayer, but adhere to the surface of the plasma membrane, are called __________.

Homeostasis and occupying space are both unique characteristics of living things.