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Terms in this set (30)
Which of the following binds to the active site of an enzyme?
Does this correctly represents the mechanism of enzyme function? E + S -> E-S -> E-P -> E + P
more than one
An enzyme can bind _____ reactant at a time.
An enzyme speeds up a chemical reaction in the cell, and can be used _____ times.
on the microvilli of the small intestine
Where is sucrose found in the human body?
breaks sucrose into glucose and fructose.
In simple terms sucrase...
by binding to the active site
How does sucrose change the configuration of sucrase?
How often can a sucrase molecule be used to hydrolyze sucrose?
Blood sugar refers to what molecule circulating in blood?
molecules from areas of higher concentration to areas of lower concentration.
Simple diffusion is defined as the movement of...
the dissolved sugar molecules are evenly distributed throughout the solution.
When sugar is mixed with water, equilibrium is reached when...
temperature, size of molecules, and steepness of the concentration gradient
The rate of diffusion is affected by which of the following?
The molecules in a solid lump of sugar do not move. (true/false)
Diffusion is one of the processes whereby materials are exchanged between a cell and its environment. (true/false)
Facilitated diffusion requires...
in either direction depending on the concentration gradient of the molecule
Facilitated diffusion occurs...
sugars and amino acids
Facilitated diffusion is used to transport...
Unlike simple diffusion, facilitated diffusion requires energy expenditure by the cell. (true/false)
Facilitated diffusion requires a specific transporter for a specific molecule. (true/false)
water molecules across a membrane from an area of high water concentration to an area of lower concentration
Osmosis is best defined as the movement of...
small nonpolar molecules
Which of the following will pass through a cell membrane most easily?
small polar molecules
small nonpolar molecules
large polar molecules
large nonpolar molecules
large neutral molecules
A red blood cell placed in a hypertonic medium will...
A 5% urea solution is hypotonic to a 10% urea solution. (true, false)
If a cell is placed in an isotonic medium, there will be no net movement of water. (true/false)
sodium ions out of the cell and potassium ions into the cell
The sodium-potassium pump functions to pump...
breakdown of ATP
What is the source of energy used to power the sodium-potassium pump?
3 Na+ and 2 K+
During one cycle, the sodium-potassium pump binds and moves.
The sodium-potassium pump is a trans-membrane protein.
The binding and release of sodium or potassium ions are due to conformational changes in the protein.
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