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Proteins perform all of the following functions except __________.

The pH of blood plasma is approximately 7.4, which is slightly acidic.

__________ provide motility to a sperm cell, __________ act as sensory “antennae” in many cells, and ____________ increase a cell’s surface area.

Which of the following does not affect the rate of diffusion?

What level of structural hierarchy is represented by the letter E?

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.