Biochemistry: Concepts and Connections (2nd Edition)
2nd Edition
ISBN: 9780134641621
Author: Dean R. Appling, Spencer J. Anthony-Cahill, Christopher K. Mathews
Publisher: PEARSON
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Textbook Question
Chapter 4, Problem 8P
Refer to Figure 4.15, which presents the Meselson-Stahi experiment. DNA molecules can be denatured by high pH, as well as by heat. Suppose that the CsCl gradient centrifugations were run at pH 12, conditions under which DNA strands separate. Sketch the gradient profiles expected for each of the four samples depicted in the figure.
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4. Only ONE of the five compounds below can be prepared by an aldol condensation in
which a single carbonyl compound is treated with base. Which one is it?
To solve this problem, reverse the aldol condensation that formed each of these molecules to find out what two molecules
came together to make the products. The one in which the two molecules are identical is the answer.
Ph
Ph
ཚིག གནས ག ནཱ ཀ ན ཀནཱ
A
Ph
H
B
Ph
Ph
H
D
Ph.
Ph
Ph
E
H
5. Which one is the major organic
product obtained from the following
reaction sequence?
First, equimolar amounts of cyclopentanone and
LDA are mixed at -78°C. Then propionaldehyde
(propanal) is added. Addition of aqueous acid
completes the process.
LDA, -78°C.
1.
2. H₂O*
H
A
B
H
0
D
H
H
E
2. Which one is the major organic
product obtained from the following
reaction?
NaOH, H₂O
heat
A
B
C
D
E
Chapter 4 Solutions
Biochemistry: Concepts and Connections (2nd Edition)
Ch. 4 - Prob. 1PCh. 4 - What is the difference between a nucleoside...Ch. 4 - pppApCpCpupApGpApu-OH a. Using the straight-chain...Ch. 4 - Shown is a representation of a molecule being...Ch. 4 - Base analysis of DNA from maize (com) shows it to...Ch. 4 - Using the pKa data in Table 4.1 and the...Ch. 4 - For some DNAs, it is possible to separate the two...Ch. 4 - Refer to Figure 4.15, which presents the...Ch. 4 - Suppose that you centrifuged a transfer RNA...Ch. 4 - Predict the structure of a cruciform that could be...
Ch. 4 - DNA from a newly discovered virus was purified,...Ch. 4 - Would you expect Neurospora crassa DNA to have a...Ch. 4 - A circular double-stranded DNA molecule contains...Ch. 4 - The gel electrophoresis pattern in Figure 4.23 was...Ch. 4 - 15. DNA polymerase requires both a template, to be...Ch. 4 - Prob. 16PCh. 4 - Prob. 17PCh. 4 - a. What two enthalpic factors stabilize DNA in...Ch. 4 - 19.
a. The plasmid pBR322 (4362 base pairs) was...Ch. 4 - Prob. 20PCh. 4 - What DNA sequence feature is required for a...
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- CH3CH2CHO + propanal PhCH2CHO 2-phenylacetaldehyde mixture of four products NaOH 10. In the crossed aldol reaction of propanal and 2-phenylacetaldehyde shown above, a mixture of four products will be formed. Which ONE of the compounds below will NOT be formed in this crossed aldol reaction? OH Ph A H OH OH Ph H B OH OH H H H Ph Ph C Ph D Earrow_forwardAn organic chemist ordered the wrong item. She wanted to obtain 1-hydroxy-2-butanone, butinstead ordered 2-hydroxybutyraldehyde. As a good biochemist, show how the organic chemistcould use biological catalysis to make her desired compound.arrow_forwardPredict the products of aldolase catalyzing the reaction with acetone and (S)-3-hydroxybutyraldehyde.arrow_forward
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- A non-hydrolysable ATP (AMPPNP - below) is ingested by a graduate student on a dare. Whateffects would you anticipate on his metabolism?arrow_forwardShow the mechanism for the acid-catalyzed formation of an [α-1,6] glycosidic linkagebetween two molecules of α-D-glucopyranose. Please sketch the structure and use arrows showing electron flow!arrow_forwardI am a Biochemistry student and I am confused on how to analyze FRAP Analysis using Excel Spread Sheets. The following spread sheet has my 0 minute data listed at top and the 4 minute data listed on the bottom. Sheet: https://mnscu-my.sharepoint.com/:x:/g/personal/vi2163ss_go_minnstate_edu/EXjrCizWiXRPmpittqZA12IB8EkB5eE8iaRqj_iun-IAtg?rtime=Wo9zPHFY3Ug The formula for FRAP Analysis is: FRAP value = A (4 min sample) - A (0 min sample) over A (4 min 30 uM ascorbic acid) - A (0 min 30 uM ascorbic acid) multiplied by 30 uM and the dilution factor of 1/10arrow_forward
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