Concept explainers
(a)
Interpretation:
In α-helix of protein and the double helix of DNA, the units that repeat in the backbone of the polymer chain has to be compared.
Concept Introduction:
The proteins are the
The DNA molecule is also a polymer which is made up of
(b)
Interpretation:
In α-helix of protein and the double helix of DNA, the projection of substituents in space along the backbone relative to the axis of the helix has to be compared.
Concept Introduction:
The proteins are the polymers which are made up of the amino acids. The amino acids are linked together by peptide bonds.
The DNA molecule is also a polymer which is made up of nucleic acids. The nucleic acids are made of nucleotides. The nucleotides contains nitrogen base, sugar molecule and phosphate ion. The nucleotides are linked by phosphodiester bonds to form the nucleic acid.
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Organic Chemistry
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- A chemist wanted to test his hypothesis that the disulfide bridges that form in many proteins do so after the minimum energy conformation of the protein has been achieved. He treated a sample of an enzyme that contained four disulfide bridges with 2-mercaptoethanol and then added urea to denature the enzyme. He slowly removed these reagents so that the enzyme could re-fold and re-form the disulfide bridges. The enzyme he recovered had 80% of its original activity. What would be the percent activity in the recovered enzyme if disulfide bridge formation were entirely random rather than determined by the tertiary structure? Does this experiment support his hypothesis?arrow_forwardA chemist, during the course of an analysis, runs across a chemical composed of carbon, hydrogen, and oxygen in the proportion 1:2:1 and having a six-sided molecular shape. It is probably (a) a pentose, (b) an amino acid, (c) a fatty acid, (d) a monosaccharide, (e) a nucleic acid.arrow_forward
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