AP BIOLOGY UNIT 2 TEST WITH 100% CORRECT ANSWERS

AP BIOLOGY UNIT 2 TEST WITH 100%
CORRECT ANSWERS



hydrophilic region of phospholipid - ANS -phosphate "head" pointed
away from the interior of the cell membrane


hydrophobic region of phospholipid - ANS -fatty acid "tails" pointed
towards the interior of the cell membrane


embedded protein - ANS -proteins embedded into the phospholipid
bilayer


selective permeability - ANS -A property of a plasma membrane that
allows some substances to cross more easily than others.


substances that can freely pass through the plasma membrane - ANS -
small nonpolar molecules, such as N2, O2, and CO2


substances that pass through embedded channels and transport
proteins - ANS -hydrophilic substances such as large polar molecules
and ions

, cell wall - ANS -provides structural boundary for plants, fungi, and
prokaryotes, composed of complex carbohydrates


passive transport - ANS -the net movement of molecules from high
concentration to low concentration without the use of energy


active transport - ANS -requires the direct input of energy to move
molecules from low concentration to high concentration


exocytosis - ANS -process of moving substances out of the cell, internal
vesicles fuse with the plasma membrane and secrete large
macromolecules out of the cell, requires energy input


endocytosis - ANS -the cell takes in macromolecules and particulate
matter by forming new vesicles derived from the plasma membrane,
requires energy input


facilitated diffusion - ANS -movement of specific molecules across cell
membranes through protein channels


aquaporins - ANS -water channel proteins