Q: The two sides of the DNA double helix are connected by pairs
The two sides of the DNA double helix are connected by pairs of bases (adenine, thymine, cytosine, and guanine). Because of the geometric shape of these molecules, adenine bonds with thymine and cytos...
See AnswerQ: Refer to Exercise 21.21. Figure E21.22 shows
Refer to Exercise 21.21. Figure E21.22 shows the bonding of cytosine and guanine. The O—H and H—N distances are each 0.110 nm. In this case, assume that the bonding...
See AnswerQ: The following disubstituted cyclohexane, drawn in a Newman projection, was
The following disubstituted cyclohexane, drawn in a Newman projection, was shown to have moderate antiviral activity. a. As depicted above, is the adenine group (highlighted) occupying an axial or an...
See AnswerQ: Draw the nucleoside formed from each of the following pairs of compounds
Draw the nucleoside formed from each of the following pairs of compounds and name the nucleoside: a. 2-Deoxy-d-ribose and adenine b. d-Ribose and guanine
See AnswerQ: Sometimes DNA polymerase makes a mistake, and the wrong nucleotide is
Sometimes DNA polymerase makes a mistake, and the wrong nucleotide is added to the growing DNA strand. With regard to pyrimidines and purines, two general types of mistakes are possible. The addition...
See AnswerQ: In the following drawing, the top strand is the template DNA
In the following drawing, the top strand is the template DNA, and the bottom strand shows the lagging strand prior to the action of DNA polymerase I. The lagging strand contains three Okazaki fragment...
See AnswerQ: A double-stranded DNA molecule is 1 cm long, and
A double-stranded DNA molecule is 1 cm long, and the percentage of adenine in it is 15%. How many cytosines does this DNA molecule contain?
See AnswerQ: The compound known as nitrous acid is a reactive chemical that replaces
The compound known as nitrous acid is a reactive chemical that replaces amino groups (−− NH2) with keto groups (== O). When nitrous acid reacts with the bases in DNA, it can change cytosine to uracil...
See AnswerQ: What is the role of the coenzyme nicotinamide adenine dinucleotide (NAD
What is the role of the coenzyme nicotinamide adenine dinucleotide (NAD+) in enzyme-catalyzed oxidation reduction reactions?
See AnswerQ: Draw the structure of an alanine residue bound to the 39 position
Draw the structure of an alanine residue bound to the 39 position of adenine at the 39 end of alanyl tRNA. The amino acyl linkage is formed between the 39—OH of the tRNA and the ca...
See AnswerQ: Referring to the structures in Figures 20.1 and 20.
Referring to the structures in Figures 20.1 and 20.3, draw the structures for nucleotides consisting of the following units. Figures 20.1: Figures 20.3: a. 29-Deoxyribose, thymine, one phosphoryl...
See AnswerQ: The technology of DNA typing had its beginnings in 1985 with the
The technology of DNA typing had its beginnings in 1985 with the work of: A) Henry Lee. B) Francis Crick. C) James Watson. D) Alec Jeffreys. 2) DNA is a(n): A) Protein. B) Starch. C) Polymer. D...
See AnswerQ: The reduced form of nicotinamide adenine dinucleotide (NADH) is an
The reduced form of nicotinamide adenine dinucleotide (NADH) is an important and highly fluorescent coenzyme. It has an absorption maximum of 340 nm and an emission maximum at 465 nm. Standard solutio...
See AnswerQ: In a DNA molecule, the base pair adenine and thymine is
In a DNA molecule, the base pair adenine and thymine is held together by two hydrogen bonds (see Fig. 16.5). Let’s model one of these hydrogen bonds as four point charges arranged al...
See AnswerQ: The two strands of the DNA molecule are held together by hydrogen
The two strands of the DNA molecule are held together by hydrogen bonds between base pairs (Sec. 16.1). When an enzyme unzips the molecule to separate the two strands, it has to break these hydrogen b...
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