Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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Chapter 12, Problem 19P
Interpretation Introduction
Interpretation:
The reason for the membrane proteins to be more difficult to purify and crystallize needs to be explained.
Concept introduction:
With biological membranes, membrane proteins get interacted. There are three functions of membrane proteins. They are integral, peripheral membrane proteins and polypeptide toxins. Transmembrane and integral monotopic proteins are the subparts of integral proteins.
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Thinking about cell membranes.
a) The fatty acid tails of the phospholipids that make up cell membranes canbe either saturated or unsaturated. Which type of lipid will lead to a membranewith more mechanical strength? Explain your answer.
b) One difference between bacterial and eukaryotic membranes is the presenceof cholesterol in eukaryotic membranes. What is the structure of cholesterol?Explain how adding cholesterol to a phospholipid membrane will affect thestability of the membrane.
c) “Anammox” bacteria are unique in that they can perform anaerobic ammoniaoxidation, or the production of nitrogen gas from ammonia (Damasté et al. Nature2002, 419, 708.). Intermediates along this reaction pathway include hydrazine(N2H4) and hydroxylamine (NH2OH), both of which are extremely toxic to the cell.The ammonia oxidation reactions are believed to occur inside a membrane-bound structure within the cell called the “anammoxosome.” The structure of oneof the lipids of the anammoxosome is shown…
Please ASAP. Thanku.
Which of the following can undergo simple diffusion through a phospholipid bilayer?
K+
H2O
CO2
Glucose
Image analysis.
The outer boundary of the cell is the plasma membrane.In the image below,
molecules that cannot cross the membrane are glucose and ions.Why can't they
cross the membrane? [MA]
(c)
(d)
(a)
Small uncharged
molecules
(b)
Lipid-soluble Water-soluble
substances
lons
substances
Glucose
Hydrocarbon
Nat
K+
H20
CO2
H+
cF Cat+
NH3
O They are hydrophobic
O They are hydrophilic
O large
O Na, K, Ca and H ions will bind with phosphate
Chloride ions will be repelled by phosphate
they are small in size
to
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