Biology 212 Exam 1 with correct
Answers
How does one determine the number of covalent bonds an element will likely form? -
Correct Answers -The number of valence electrons
What properties make water an excellent solvent? - Correct Answers -Polarity,
molecular shape, hydrogen bonding
An amphipathic molecule contains what? - Correct Answers -Both hydrophilic and
hydrophobic zones
We find an unknown liquid that is non-polar. When it is placed in water, what can we
expect to happen? - Correct Answers -The unknown liquid will not dissolve
A newly discovered organelle breaks apart a protein and puts it back together. Which
processes are used? - Correct Answers -Hydrolysis and dehydration reactions
Pasteur used two types of flasks in his famous experiment: an open-top and a swan-
necked flask. What was the experimental variable? - Correct Answers -Access to
microbes in the air
If the energy, ATP, levels are high in the cells, the cells will slow down the process of
cellular respiration until the energy levels are low again to help maintain homeostasis
and glucose stores. Which of the following best describes how the cells achieve this
balance? - Correct Answers -Allosteric inhibition by ATP binding to the regulatory site of
the enzyme
You are studying a new organism in the lab that appears to have abnormal cellular
respiration. You notice that the amount of product from the citric acid cycle is much
lower than you might expect, which is causing a lack of electrons moving to the electron
transport chain. Which of the following could NOT be a possible explanation? - Correct
Answers -The electron transport chain has a buildup of oxygen available so it does not
need electrons
After sprinting after your dog down the street you realize you are breathing heavily and
your heartbeat is racing. You know that your body has likely used most of its oxygen
supply due to your current state. What is a possible cellular explanation for your
, increased breathing rate? - Correct Answers -The electron transport chain shuts down
and lactic acid fermentation begins
What is responsible for lipid bilayer formation in water with phospholipids? - Correct
Answers -Amphipathic properties of phospholipids
What type of transport mechanism could be used to move a molecule of glucose across
a membrane against a concentration gradient? - Correct Answers -Active transport
As lipids become less saturated, we expect membrane permeability to - Correct
Answers -Increase
Peripheral membrane proteins differ from transmembrane proteins in that they - Correct
Answers -Do not cross the lipid bilayer
A toxin is known to disrupt actin filaments and microtubules. Which cell structure and
function are most affected? - Correct Answers -Cytoskeleton - cell movements
Which of the following can be found in prokaryotic cells? - Correct Answers -Ribosomes
A pure phospholipid membrane separates two chambers of water. Oxygen molecules
and potassium ions are added to the water in Chamber #1. You return to the chamber
after a few days and notice that everything that was added is now present in Chamber
#2. What is the relative permeability of these molecules across this lipid bilayer from
most permeable to least permeable? - Correct Answers -Oxygen, water, potassium
Chamber A is separated from Chamber B by a phospholipid membrane that contains
only water permeable channels. If Chamber A contains 0.4 M sodium in solution and
chamber B contains 0.1 M sodium in solution, in which direction will the water flow and
what would equilibrium be? - Correct Answers -Water will move from Chamber A to
Chamber B, equilibrium would be 0.25 M
A cell containing a phospholipid membrane that typically transports sodium using an
ATP-driven sodium pump is prevented from making additional ATP. Which of the
following statements is true regarding the cell? - Correct Answers -The pump still stop
pumping sodium against the concentration gradient
Consider a lipid membrane consisting of fatty acids with two double bonds. What would
you expect of the resulting membrane? - Correct Answers -The membrane has fluidity
A cell is moved from a warm incubator to a cold lab bench. Which of the following
adjustments could the cell make to keep membrane fluidity the same? - Correct
Answers -Increase proportion of unsaturated hydrocarbon tails in the membrane
phospholipids
Answers
How does one determine the number of covalent bonds an element will likely form? -
Correct Answers -The number of valence electrons
What properties make water an excellent solvent? - Correct Answers -Polarity,
molecular shape, hydrogen bonding
An amphipathic molecule contains what? - Correct Answers -Both hydrophilic and
hydrophobic zones
We find an unknown liquid that is non-polar. When it is placed in water, what can we
expect to happen? - Correct Answers -The unknown liquid will not dissolve
A newly discovered organelle breaks apart a protein and puts it back together. Which
processes are used? - Correct Answers -Hydrolysis and dehydration reactions
Pasteur used two types of flasks in his famous experiment: an open-top and a swan-
necked flask. What was the experimental variable? - Correct Answers -Access to
microbes in the air
If the energy, ATP, levels are high in the cells, the cells will slow down the process of
cellular respiration until the energy levels are low again to help maintain homeostasis
and glucose stores. Which of the following best describes how the cells achieve this
balance? - Correct Answers -Allosteric inhibition by ATP binding to the regulatory site of
the enzyme
You are studying a new organism in the lab that appears to have abnormal cellular
respiration. You notice that the amount of product from the citric acid cycle is much
lower than you might expect, which is causing a lack of electrons moving to the electron
transport chain. Which of the following could NOT be a possible explanation? - Correct
Answers -The electron transport chain has a buildup of oxygen available so it does not
need electrons
After sprinting after your dog down the street you realize you are breathing heavily and
your heartbeat is racing. You know that your body has likely used most of its oxygen
supply due to your current state. What is a possible cellular explanation for your
, increased breathing rate? - Correct Answers -The electron transport chain shuts down
and lactic acid fermentation begins
What is responsible for lipid bilayer formation in water with phospholipids? - Correct
Answers -Amphipathic properties of phospholipids
What type of transport mechanism could be used to move a molecule of glucose across
a membrane against a concentration gradient? - Correct Answers -Active transport
As lipids become less saturated, we expect membrane permeability to - Correct
Answers -Increase
Peripheral membrane proteins differ from transmembrane proteins in that they - Correct
Answers -Do not cross the lipid bilayer
A toxin is known to disrupt actin filaments and microtubules. Which cell structure and
function are most affected? - Correct Answers -Cytoskeleton - cell movements
Which of the following can be found in prokaryotic cells? - Correct Answers -Ribosomes
A pure phospholipid membrane separates two chambers of water. Oxygen molecules
and potassium ions are added to the water in Chamber #1. You return to the chamber
after a few days and notice that everything that was added is now present in Chamber
#2. What is the relative permeability of these molecules across this lipid bilayer from
most permeable to least permeable? - Correct Answers -Oxygen, water, potassium
Chamber A is separated from Chamber B by a phospholipid membrane that contains
only water permeable channels. If Chamber A contains 0.4 M sodium in solution and
chamber B contains 0.1 M sodium in solution, in which direction will the water flow and
what would equilibrium be? - Correct Answers -Water will move from Chamber A to
Chamber B, equilibrium would be 0.25 M
A cell containing a phospholipid membrane that typically transports sodium using an
ATP-driven sodium pump is prevented from making additional ATP. Which of the
following statements is true regarding the cell? - Correct Answers -The pump still stop
pumping sodium against the concentration gradient
Consider a lipid membrane consisting of fatty acids with two double bonds. What would
you expect of the resulting membrane? - Correct Answers -The membrane has fluidity
A cell is moved from a warm incubator to a cold lab bench. Which of the following
adjustments could the cell make to keep membrane fluidity the same? - Correct
Answers -Increase proportion of unsaturated hydrocarbon tails in the membrane
phospholipids
