Study sets, textbooks, questions
Upgrade to remove ads
MB CH5: The Working Cell
Mastering Biology Chapter 5: The Working Cell Dynamic Study Molecule
Terms in this set (25)
Before refrigeration, meat was preserved by adding ________. What effect did this have on any contaminating bacteria or fungi?
concentrated salt solutions: plasmolysis
One model of the cell membrane is that it is a "fluid mosaic." What does this mean?
It consists of proteins suspended in a fluid phospholipid bilayer.
Which of the following prevents the cells of a freshwater fish from becoming hypotonic and bursting?
Which of the following statements about coenzymes is correct?
They are organic cofactors with enzymes in reactions.
Which is the most inclusive and correct list of substances that use facilitated diffusion to cross cell membranes?
sugars, amino acids, ions, water
Researchers used frog eggs to learn more about aquaporins. What characteristic of normal frog eggs was essential in these studies?
They are largely impermeable to water.
In what sense are living cells more efficient than internal combustion engines?
They convert a greater proportion of fuel to useful energy.
What is one way of reducing the effectiveness of a competitive enzyme inhibitor?
Increase the concentration of the substrate.
What is the consequence of this inhibition as Product X accumulates?
The concentration of Molecule B increases.
What is the function of the sodium-potassium pump in nerve cells?
pump Na+ out of the cell and K+ into the cell
________ energy is the type of ________ energy used to power the work of the cell.
Endergonic reactions _______ energy and result in products that have _____ potential energy than the reactants.
Which of the following is a CORRECT statement about aquaporins?
Each aquaporin molecule allows billions of molecules of water to cross the plasma membrane each second.
Which method of transport uses coated pits?
Building a molecule of ATP is an ________process. Hydrolyzing a molecule of ATP is an _______ process. This cycle is an example of _________.
endergonic: exergonic: energy coupling
A plant cell placed into an isotonic solution _______. An animal cell placed into an isotonic solution _______.
becomes flaccid: neither swells nor shrivels
The pesticide malathion and some drugs used as anesthetics both block an enzyme that is critical for transmitting nerve impulses. Why don't patients die like insects when they undergo surgery?
Enzyme inhibition with malathion is irreversible but with anesthetics, reversible.
When you hear "Substance X is moved against its concentration gradient," what do you think of?
Substance X has moved from a region of lower to a region of higher concentration with the help of ATP.
Photosynthesis is an _______ process. Energy from ______ allows the production of products with ________.
endergonic: the sun: higher potential energy than the reactants
What is meant by the term "enzyme specificity"?
An enzyme catalyzes only one type of reaction.
Imagine a U-shaped tube with a membrane at the bottom of the "U". The membrane is permeable to glucose, sucrose and water. You place a concentrated glucose solution on Side A and an equally concentrated sucrose solution on Side B. Describe the movement of each solute across the membrane during the first few hours.
Glucose will move into Side B down its concentration gradient, and sucrose will move into Side A down its concentration gradient.
At what stage of active transport is ATP needed?
for the transport protein to change its shape
In what way, if any, does osmosis differ from simple diffusion?
Polar water molecules cluster with hydrophilic molecules, so only free water diffuses down its concentration gradient.
Enzymes ______ the activation energy of a reaction. The energy change between products and reactants is _______ for a reaction that is catalyzed versus one that is not.
lower: the same
Both a living cell and an automobile convert fuel and ______ to the waste products ___________. In the process, ______ is produced, which represents the entropy of the reaction.
oxygen: CO2 and water: heat
Sets found in the same folder
Top 20 Organelles
MB CH3: Macromolecules & Enzymes PART 1
MB CH3: The Molecules of Cells
MB CH3: Macromolecules & Enzymes PART 2
Other sets by this creator
MB CH6: Homework
MB CH7: Photosynthesis: Using Light to Make Food
Lab report 5. Enzyme activity
MB CH6: How Cells Harvest Chemical Energy
Other Quizlet sets
legislative review (unit 2)
Вопросы оператор ДНГ 5-6 разряд
MGMT 455 Exam 2 - PU
BMGT 1307 Unit C test