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Mastering Biology Chapter 5-7 Questions and Answers Fully Solved
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Mastering Biology Chapter 5-7
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Mastering Biology Chapter 5-7Imagine 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. - answer
CORRECT ANSWER: Glucose will move into Side B down its concentration gradient,
and sucrose will move into Side A down its concentration gradient.
Which is the most inclusive and correct list of substances that use facilitated diffusion to
cross cell membranes? - answer Sugar, amino acids, ions and water
When you hear "Substance X is moved against its concentration gradient," what do you
think of? - answer Substance X has moved from a region of lower to a region of higher
concentration with the help of ATP.
Before refrigeration, meat was preserved by adding ________. What effect did this have
on any contaminating bacteria or fungi? - answer concentrated salt solutions,
plasmolysis
Hydrolyzing a molecule of ATP is an ___ process. Building a molecule of ATP is an ___
process. This cycle is an example of ___. - answerEndergonic, exergonic, energy
coupling
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. -
answerlower, the same
what is meant by the term "enzyme specificity"? - answeran enzyme catalyzes only one
type of reaction
which of the following prevents the cells of a freshwater fish from becoming hypotonic
and bursting? - answerosmoregulation
which of the following statements about coenzymes is correct? - answerthey are organic
cofactors with enzymes in reactions
which method of transport uses coated pits? - answerreceptor-mediated endocytosis
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. -
answerglucose will move into slide B down its concentration gradient, and sucrose will
move into slide A down concentration gradient
both a living cell an automobile convert fuel and ____ to the waste products ____. in the
process, ____ is produced, which represents the entropy of the reaction. -
answeroxygen, CO2 and water: heat
Photosynthesis is an ___ process. Energy from ___ allows the production of products
with ___. - answerendergonic, the sun, higher potential energy than the reactants
what is the function of sodium-potassium pump in nerve cells? - answerpump Na+ out
of the cell and K+ into the cell
In what way, if any, does osmosis differ from simple diffusion? - answerPolar water
molecules cluster with hydrophilic molecules, so only free water diffuses down its
concentration gradient
at what stage of active transport is ATP needed? - answerfor the transport protein to
change its shape
_____ energy is the type of ____ energy used to power the work of the cell -
answerchemical, potential
Which of the following is a correct statement about aquaporins? - answereach
aquaporin molecule allows billions of molecules of water to cross the plasma membrane
each second
A plant cell placed into an isotonic solution ___. An animal cell placed into an isotonic
solution ___. - answerbecomes flaccid, neither swells nor shrivels
what is one way of reducing the effectiveness of a competitive enzyme inhibitor? -
answerincrease the concentration of the substrate
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? - answerenzyme inhibition with malathion is irreversible but with
anesthetics, reversible
In what sense are living cells more efficient than internal combustion engines? -
answerthey convert a greater proportion of fuel to useful energy
Imagine a metabolic pathway where: molecule A - molecule B - molecule C - Molecule
D - product X. Enzyme 1 catalyzes the first reaction, enzyme 2 catalyzes the second
reaction, and so on. Product X exerts feedback inhibition on Enzyme 2. What is the
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