Chapter 7 Biology
During one cycle, the sodium-potassium pump binds and moves.
Na+ and 2 K+.
If the material the cell takes in is liquid, the process is termed pinocytosis.
True
Low-density lipoprotein is brought into the cell by receptor-mediated endocytosis.
True
Eukaryotic Cell
animal and plant cells
Endoplasmic Reticulum
assembly line
What is the source of energy used to power the sodium-potassium pump?
breakdown of ATP
Facilitated diffusion requires
carrier proteins.
Lysosomes
cleaning crew
Nucleus
control center
Golgi Complex
distribution center
The molecules in a solid lump of sugar
do move
Facilitated Diffusion
does not require energy (glucose)
Simple Diffusion
does not require energy (no vacuole)
Unlike simple diffusion, facilitated diffusion requires energy expenditure by the cell.
false
Facilitated diffusion occurs
in either direction depending on the concentration gradient of the molecule.
Diffusion
is one of the processes whereby materials are exchanged between a cell and its environment.
Which of the following statements about receptor-mediated endocytosis is TRUE?
it involves clathrin-coated pits
Simple diffusion is defined as the movement of
molecules from areas of higher concentration to areas of lower concentration.
Certain white blood cells engulf microorganisms and bring them in to digest them. This process is best described as
phagocytosis.
Central Vacuole, Cell Wall
plant cell
Mitochondria
powerhouse
Exocytosis is a process by which cells
release substances from the cell via vesicles.
Active Transport
requires energy input (small)
A red blood cell placed in a hypertonic medium will
shrink.
Which of the following will pass through a cell membrane most easily?
small nonpolar molecules
The sodium-potassium pump functions to pump
sodium ions out of the cell and potassium ions into the cell.
Cytoskeleton
structure
Facilitated diffusion is used to transport
sugars and amino acids.
The rate of diffusion is affected by
temperature, size of molecules, steepness of the concentration gradient
When sugar is mixed with water, equilibrium is reached when
the dissolved sugar molecules are evenly distributed throughout the solution.
A 5% urea solution is hypotonic to a 10% urea solution.
true
Facilitated diffusion requires a specific transporter for a specific molecule.
true
If a cell is placed in an isotonic medium, there will be no net movement of water.
true
The binding and release of sodium or potassium ions are due to conformational changes in the protein.
true
The sodium-potassium pump is a trans-membrane protein.
true
Osmosis is best defined as the movement of
water molecules across a membrane from an area of high water concentration to an area of lower concentration.
Ribosomes
workbenches
