Lab Quiz 4 Flashcards
(21 cards)
a semi-solid matrix with holes which allows only small molecules to pass through it
agar plates
What is the objective of lab 4?
To understand the processes of diffusion, osmosis and selectively permeable membranes
The tendency for the molecules of a substance to spread out, randomly, into a given space
diffusion
Movement of water from a region of low solute concentration to a region of higher solute concentration through a semi permeable membrane
osmosis
How do cells rely on osmosis?
Nutrient and water uptake
Waste removal
Maintenance of homeostasis
A measure of the effective osmotic pressure gradient
tonicity
Higher solute concentration
hypertonic
Lower solute concentration
hypotonic
Equal solute concentration
isotonic
movement from lower to higher concentration
active diffusion
movement from higher to lower concentration
passive diffusion
passing easily from higher to lower concentration through the membrane without help
simple diffusion
passing through the membrane with the help of an enzyme from higher to lower concentration
facilitated diffusion
passing through the membrane from low to high concentration with the use of ATP
active transport
What is the goal of lab 5?
To identify the parts of an enzyme-catalyzed reactions and test the effects of pH and temperature on enzyme activity
Many enzymes act as ______, designed to speed up the rate of a specific chemical reaction
catalysts
Free energy can perform _____
work
the cleavage of chemical bonds by the addition of water
hydrolysis
The _____ (3º) structure of a protein is made up of multiple secondary structures whose side chains interact with each other to form a specific geometric shape.
tertiary
Anything that changes the 3º structure at the active site of the enzymes will affect the ability of that enzyme to function
denaturation
Every enzyme functions best at an optimum __, and less well within a range on either side of it.
pH
