BIOCHEMISTRY (LL)
9th Edition
ISBN: 9781337805100
Author: Campbell
Publisher: CENGAGE L
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Chapter 8, Problem 13RE
REFLECT AND APPLY In the produce department of supermarkets, vegetables and fruits (cucumbers are an example) have been coated with wax for shipping and storage. Suggest a reason why this is done.
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At a pH equal to the isoelectric point (pl) of alanine, the net charge of alanine is zero. Two structures can be drawn that have a
net charge of zero, but the predominant form of alanine at its pl is zwitterionic.
CH3
H,N
CH3
**
H¸N-C
H
Zwitterionic
H
Uncharged
OH
Select statements that explain why alanine is predominantly zwitterionic at its pl.
pk of alanine's amino group is more than its pl.
pk of alanine's carboxyl group is more than its pl.
PK of alanine's carboxyl group is less than its pl.
pk of alanine's amino group is less than its pl.
Correct Answer
What fraction of alanine is in the completely uncharged form at its pl?
1 in 2.2 × 107
1 in 1.6 × 10²
1 in 4680
1 in 9460
How does a voltage-gated sodium channel work? Specifically, how and why does a change in voltage trigger their opening? Please be detailed
When sodium ions enter a neuron during depolarization, they trigger the opening of additional voltage-gated sodium channels nearby, creating a positive feedback loop where the influx of sodium ions further depolarizes the membrane, causing even more sodium channels to open and allowing more sodium ions to enter the cell, thus sustaining the depolarization process until the action potential peaks. But how and why exactly does the influx of sodium ions trigger more sodium channels to let in more sodium? Please explain
Chapter 8 Solutions
BIOCHEMISTRY (LL)
Ch. 8 - RECALL Proteins, nucleic acids, and carbohydrates...Ch. 8 - RECALL What structural features do a...Ch. 8 - RECALL Draw the structure of a phosphoacylglycerol...Ch. 8 - RECALL What structural features do a sphingomyelin...Ch. 8 - RECALL You have just isolated a pure lipid that...Ch. 8 - RECALL What structural features does a...Ch. 8 - RECALL Write the structural formula for a...Ch. 8 - RECALL How does the structure of steroids differ...Ch. 8 - Prob. 9RECh. 8 - REFLECT AND APPLY Which is more hydrophilic,...
Ch. 8 - Prob. 11RECh. 8 - REFLECT AND APPLY Succulent plants from arid...Ch. 8 - REFLECT AND APPLY In the produce department of...Ch. 8 - REFLECT AND APPLY Egg yolks contain a high amount...Ch. 8 - REFLECT AND APPLY In the preparation of sauces...Ch. 8 - REFLECT AND APPLY When water birds have had their...Ch. 8 - RECALL Which of the following lipids are not found...Ch. 8 - RECALL Which of the following statements is (are)...Ch. 8 - REFLECT AND APPLY Why might some food companies...Ch. 8 - Prob. 20RECh. 8 - BIOCHEMICAL CONNECTIONS Crisco is made from...Ch. 8 - BIOCHEMICAL CONNECTIONS Why does the American...Ch. 8 - REFLECT AND APPLY In lipid bilayers, there is an...Ch. 8 - Prob. 24RECh. 8 - REFLECT AND APPLY Suggest a reason why the cell...Ch. 8 - REFLECT AND APPLY Suggest a reason why animals...Ch. 8 - REFLECT AND APPLY What is the energetic driving...Ch. 8 - Prob. 28RECh. 8 - RECALL How can fluorescence techniques be used to...Ch. 8 - Prob. 30RECh. 8 - Prob. 31RECh. 8 - REFLECT AND APPLY A membrane consists of 50%...Ch. 8 - REFLECT AND APPLY Suggest a reason why the same...Ch. 8 - REFLECTANDAPPLY Suppose that you are studying a...Ch. 8 - REFLECT AND APPLY Which statements are consistent...Ch. 8 - RECALL What role does phosphorylation of tyrosine...Ch. 8 - Prob. 37RECh. 8 - REFLECT AND APPLY Suggest a reason why inorganic...Ch. 8 - REFLECT AND APPLY Which statements are consistent...Ch. 8 - RECALL What happens to the human growth hormone...Ch. 8 - Prob. 41RECh. 8 - RECALL What is the structural relationship between...Ch. 8 - Prob. 43RECh. 8 - RECALL What are isoprene units? What do they have...Ch. 8 - Prob. 45RECh. 8 - Prob. 46RECh. 8 - Prob. 47RECh. 8 - Prob. 48RECh. 8 - Prob. 49RECh. 8 - Prob. 50RECh. 8 - REFLECT AND APPLY A health-conscious friend asks...Ch. 8 - Prob. 52RECh. 8 - Prob. 53RECh. 8 - Prob. 54RECh. 8 - REFLECT AND APPLY List two classes of compounds...Ch. 8 - BIOCHEMICAL CONNECTIONS Outline a possible...
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