CAMPBELL BIOLOGY IN FOCUS CHAPTER 43 FINAL PAPER SOLVED QUESTIONS WITH COMPLETE ANSWERS.pdf

CAMPBELL BIOLOGY IN FOCUS CHAPTER 43
FINAL PAPER SOLVED QUESTIONS WITH
COMPLETE ANSWERS


◉ Transmembrane proteins.
Answer: Proteins that span the membrane


◉ Peripheral proteins.
Answer: Proteins not embedded in the lipid bilayer; loosely bound to
the surface of the membrane


◉ What are functions of membrane proteins?.
Answer: Transport, enzymetic activity, signal transduction, cell-cell
recognition, intercellular joining, attachment to the cytoskeleton and
extracellular matrix (ECM)


◉ Glycolipids.
Answer: Membrane carbohydrates that are covalently bonded to
lipids


◉ Glycoproteins.

, Answer: Membrane carbohydrates that are covalently bonded to
proteins


◉ How permeable is the plasma membrane?.
Answer: Small nonpolar molecules cross easily; polar molecules
don't.


◉ Transport proteins.
Answer: Transmembrane protein that helps a certain substance or
class of closely related substances to cross the membrane


◉ Channel proteins.
Answer: Proteins that provide corridors that allow a specific
molecule or ion to cross the membrane


◉ Aquaporins.
Answer: Water channel proteins


◉ Carrier proteins.
Answer: Proteins that bind to molecules and change shape to shuttle
them across the membrane


◉ Diffusion.