Description
Please read chapters 9 (hemoglobin and myoglobin) and chapter 12 (membranes) and answer back of the ebook problems.
You can watch youtube videos at the following links for background if you need to. I will give you links to videos when I get a bid.
to get to the ebook questions for both chapters follow this link : https://bookshelf.vitalsource.com/#/user/signin
user name and password will be provided when I get a bid. Chapter 9 has 25 questions to answer and chapter 12 has 33 questions. Please show all work. may be handwriting or typed.
Explanation & Answer
PLEASE FIND ANSWERS WITHOUT THE QUESTIONS FOR CHAPTER 12
QUESTION 1.
i.
Membranes are sheetlike structures that are two molecules thick.
ii.
Membranes are composed of lipids and proteins, both of which may be decorated by
carbohydrates.
iii.
Membrane lipids are amphipathic molecules, composed of hydrophilic and
hydrophobic components, that spontaneously form closed bimolecular sheets in
aqueous solution.
iv.
Proteins, unique to each membrane, mediate the transfer of molecules and information
across the membrane.
v.
Membranes are noncovalent assemblies.
vi.
The leaflets of the membrane bilayers are different; that is, membranes are
asymmetric. Membranes are fluid, rather than rigid structures.
vii.
Membranes are electrically polarized, with the inside of the cell negative with respect
to the outside.
2. First, the molecule must be lipophilic, and second, the concentration of the molecule must
be greater on one side of the membrane than on the other.
3. (a) 3 ; (b) 5; (c) 6 ; (d) 1; (e) 7 ; (f) 10; (g) 2; (h) 4; (i) 8 ; (j) 9
4. c, a, e, b, d
5. In simple diffusion, the molecule in question can diffuse down its concentration gradient
through the membrane. In facilitated diffusion, the molecule is not lipophilic and cannot
directly diffuse through the membrane. A channel or carrier is required to facilitate
movement down the gradient.
6. In passive transport (facilitated diffusion), a substance moves down its concentration
gradient through a channel or transporter. In active transport, a concentration gradient is
generated at the expense of another source of energy, such as the hydrolysis of ATP.
7. Recall that most proteins are not static structures and require conformational changes to
perform their ...
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