Question
In: Chemistry
A cell membrane at 37°C is found to be permeable to Ca2+ but not to anions,...
A cell membrane at 37°C is found to be permeable to Ca2+ but not to anions, and analysis shows the inside concentration to be 0.100 M and the outside concentration to be 0.001 M in Ca2+.
a) What potential difference in volts would have to exist across the membrane for Ca2+ to be in equilibrium at the stated concentrations? Assume that activity coefficients are equal to 1. Give the sign of the potential inside with respect to the outside.
b) If the measured inside potential is +100 mV with respect to the outside, what is the minimum (reversible) work required to transfer 1 mol of Ca2+ from outside to inside under these conditions?
Solutions
queen_honey_blossom answered 1 year agoRelated Solutions
two solutions can be found on either side of a semi-permeable membrane. a 4.0m sucrose solution...
two solutions can be found on either side of a semi-permeable
membrane. a 4.0m sucrose solution is found on the left side and a
2.0m Nacl solution is found on the right side. which direction will
the solvent flow?
Also what would happen if it was 2.0m nacl on left and 4.0m
sucrose on right ? what if it was 2.0nacl and 2.0m sucrose ?
please explain thanks
Name a membrane component that makes the membrane more permeable and one that reduces the permeability....
Name a membrane component that makes the membrane more permeable
and one that reduces the permeability. Explain why each component
affects the permeability it does.
1. The membrane is more permeable to K+ than to Na+: a. At resting membrane potential...
1. The membrane is more permeable to K+ than to Na+:
a. At resting membrane potential
b. During the depolarization phase of an action potential
c. After a neurotransmitter in an excitatory synapse binds to
the postsynaptic cell
d. More than one of the above is correct
2. During an action potential, the depolarization of the neuron
membrane is the result of:
a. Sodium moving into the cell
b. Potassium moving into the cell
c. Sodium moving out of the...
The semi-permeable cell membrane allows something to pass through and prevents others from passing. Describe what...
The semi-permeable cell membrane allows something to pass
through and prevents others from passing. Describe what types of
things would be allowed to pass through a cell membrane. Briefly
Explain.
The density of the plasma membrane of a cell was found to be 1.07 g/mL. If...
The density of the plasma membrane of a cell was found to be
1.07 g/mL. If the density of the lipid component is 0.91 g/mL and
the density of the protein component is 1.36 g/mL, what is the
percent composition (to the nearest ones) of the lipid component of
the membrane, assuming the plasma membrane consists only of the
lipid and protein components?
The density of the plasma membrane of a cell was found to be 1.07 g/mL. If...
The density of the plasma membrane of a cell was found to be
1.07 g/mL. If the density of the lipid component is 0.91 g/mL and
the density of the protein component is 1.36 g/mL, what is the
percent composition (to the nearest ones) of the lipid component of
the membrane, assuming the plasma membrane consists only of the
lipid and protein components?
The density of the plasma membrane of a cell was found to be 1.04 g/mL. If...
The density of the plasma membrane of a cell was found to be
1.04 g/mL. If the density of the lipid component is 0.92 g/mL and
the density of the protein component is 1.35 g/mL, what is the
percent composition (to the nearest ones) of the lipid component of
the membrane, assuming the plasma membrane consists only of the
lipid and protein components?
What hormone RECEPTOR is found in the membrane of both an ovarian follicular cell and a...
What hormone RECEPTOR is found in the membrane of both an
ovarian follicular cell and a testicular Sertoli cell and from
where does this hormone originate?
one-two sentence answers, please.
In a dialyse machine there are two liquids separated by a permeable membrane. The idea of...
In
a dialyse machine there are two liquids separated by a permeable
membrane. The idea of a dialysis machine is to get rid of certain
substances in the blood which will be toxic if they get too
concentrated.
1) what is one such substance?
2) describe how you would make up the composition of dialysis
fluid to make sure that this potentially toxic substance is got rid
of
The blood contains dissolved substances that you want to
keep.
3) Give...
2a. Which of these substances is not found in the cell membrane? fatty acids chitin cholesterol...
2a. Which of these substances is not found in
the cell membrane?
fatty acids
chitin
cholesterol
phospholipids
2b. In the past meat was preserved by coating it with salt. One
reason that this worked was that the salt, with a little bit of
water, is __________relative to bacteria, and water would move
_________ the bacteria killing them (hint: think beef
jerky!!!!).
hypertonic; into
hypotonic; into
hypertonic; out of
hypotonic; out of
2c. Solution A 10% salt, is compared to Solution...
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