CH 4 THE ENERGY OF LIFE PT 2
During one cycle, the sodium-potassium pump binds and moves.
3 Na+ and 2K+
Explain how active transport, ATP, Energy and concentration gradients are related
Active transport uses ATP to create a concentration gradient, which stores potential energy
What is the source of energy used to power the sodium potassium pump
Break down of ATP
What is required for facilitated diffusion to take place
Carrier proteins
Unlike simple diffusion, facilitated diffusion requires energy expenditure by the cell.
False
Your little brother just coughed right in your face and sprayed you with bacteria. Fortunately for you, your white blood cells engulf the bacteria and digest them. This process is best described as
Phagocytosis
classify each description or image on the left as the type of molecular transport it portrays
Simple diffusion- A non-water molecule moves down its concentration gradient, without the help of a carrier molecule or energy input Osmosis- Water moves down its concentration gradient into a red blood cell, your potted ivy plant is wilted but perks up after you water it active transport- through membrane proteins, requires energy
Facilitated diffusion requires a specific transporter for a specific molecule
True
low-density lipoprotein is brought into the cell by receptor-mediated endocytosis
True
Exocytosis is a process by which cells
release substances from the cell via vesicles.
Normally the salt concentration in human cells is 9 g/liter. After you eat a very salty meal, your intestinal concentration of salt might rise to 40g/liter. In this situation, what will happen to your cells
shrink
What molecules will pass through a cell membrane most easily
small nonpolar molecules
sodium-potassium pump functions to pump
sodium ions out of the cell and potassium ions into the cell
facilitated diffusion is used to transport
sugars and amino acids
facilitated diffusion and simple diffusion can act to decrease the potential energy stored across a membrane
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.
