4.5 Membrane Transport Flashcards
In passive transport, no _______ is spent to move a substance across a membrane.
energy
The diffusion of water across a membrane down its own concentration gradient and toward the region with a higher solute concentration is called
Osmosis
If a solution has a lower solute concentration than the interior of a cell, then the solution is ______ compared to the cell interior.
Hypertonic, Hypotonic, Isotonic
Hypotonic
Active transport requires what?
ATP
Particles that are too big for diffusion and active transport
become fixed to the cell membrane until lysosomes digest them.
enter and leave cells through gap junctions.
never enter cells.
enter and leave cells within vesicles.
enter and leave cells within vesicles.
What is active transport?
When substance is moved from an area where its concentration is low to an area where its concentration is high with the expenditure of energy
Exocytosis is the process of transporting substances how?
Out of the cells using vesicles
What type of molecule is likely to be able to cross a membrane by simple diffusion?
small and polar
large and polar
large and nonpolar
small and nonpolar
Small and nonpolar
What type of substance must enter and exit cells within vesicles?
Large molecules
Membrane proteins assist ions and polar molecules across membranes down their concentration gradient in facilitated diffusion or simple diffusion?
Facilitated diffusion
Knifefish have an electric organ, as described in this chapter’s Investigating Life essay. What is the function of the knifefish electric organ?
Generating an electric field that detects objects and organisms
What is exocytis?
a form of active transport and bulk transport in which a cell transports molecules out of the cell with vesicles
What is endocytosis?
cellular process in which substances are brought into the cell with a vesicle
What is phagocytis?
process by which a cell uses its plasma membrane to engulf a large particle
