EBK LEHNINGER PRINCIPLES OF BIOCHEMISTR
7th Edition
ISBN: 8220103662253
Author: nelson
Publisher: MAC HIGHER
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Chapter 9, Problem 14P
Summary Introduction
To determine: The reason behind Human Migrations II DNA which originates from Denisovans can be found in the genomes of Indigenous Australians and Melanesian Islanders. However, the same DNA markers are not found in the genomes of people native to Africa.
Concept introduction:
Evolutionary relationship is determined by checking the similarity of not only the external structures but also the similarity in the gene sequence. The evolutionary history determines the growth pattern and adaptation a particular species has undergone.
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206 Pb
82
Express your answers as integers. Enter your answers separated by a comma.
▸ View Available Hint(s)
VAΣ
ΜΕ ΑΣΦ
Np, N₁ = 82,126
Submit
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?
protons, neutrons
Please draw the inverted chair forms of the products for the two equilibrium reactions
shown below. Circle the equilibrium reaction that would have a AG = 0, i.e., the relative energy of
the reactant (to the left of the equilibrium arrows) equals the relative energy of the product? [No
requirement to show or do calculations.]
CH3
CH3
HH
CH3
1
-CH3
5.
Please consider the Newman projection of tartaric acid drawn below as an eclipsed
conformer (1). Please draw the most stable conformer and two intermediate energy conformers
noting that staggered conformers are lower in energy than eclipsed forms even if the staggered
conformers have gauche relationships between groups. [Draw the substituents H and OH on the front
carbons and H, OH and CO₂H on the back carbons based on staggered forms. -CO₂H is larger than -OH.]
OH
COH
ICOOH
COOH
COOH
1
2
COOH
COOH
3
4
Staggered
Staggered
Staggered (most stable)
Indicate the number of each conformer above (1, 2, 3 and 4) that corresponds to the relative energies
below.
Ref=0
Rotation
6. (60 points)
a. Are compounds 1 and 2 below enantiomers, diastereomers or identical?
OH
OH
HO
HO
LOH
HO
HO
OH
2
OH
OH
b. Please complete the zig-zag conformation of the compound
(3R,4S)-3,4-dichloro-2,5-dimethylhexane by writing the respective atoms in the boxes.
3.
Chapter 9 Solutions
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