Why does the DNA double helix have a uniform diameter? A) Nucleotides bind with

Question

Why does the DNA double helix have a uniform diameter? A) Nucleotides bind with nucleosides. B) Purines pair with pyrimidines. C) Deoxyribose sugars bind with ribose sugars. D) C Nucleotides pair with A nucleotides E) Nucleotides bind with nucleoside triphosphates. In an analysis of the nucleotide composition of DNA, which of the following will be found? A) A + C = G + T B) G + C = T + A C) A = G and C = T D) A = The enzyme telomerase solves the problem replication at the ends of linear chromosomes by which method? A) causing specific double strand DNA breaks that result in blunt ends both strands B) Causing linear ends of the newly replicated DNA to circularize C) adding numerous GC pairs which resist hydrolysis and maintain chromosome integrity D) adding numerous short DNA sequences such as TTAGGG, which form a hairpin turn E) adding a single 5 cap structure that resists degradation by nucleases At a specific area of a chromosome, the sequence of nucleotides below is present where the chain opens to form a replication fork:3' C C T A G G C T G C A A T C C 5' An RNA primer is formed starting at the underlined T (T) of the template. Which of the following represents the primer sequence? A) 5' G C C U A G G3' B) 5' G CCT AGG 3' C) 5' A C G T TA G G 3' D) 5' A C G U U A G G 3' E) 3' G C C T A G G 5' A new DNA strand elongates only in the 5' to 3' direction because A) DNA polymerase can only add nucleotides to the free 3' end. B) the polarity of the DNA molecule prevent addition of nucleotides at the 3' end. C) replication must progress toward the replication fork. D) Okazaki fragments prevent elongation in the 3' to 5' direction. E) DNA polymerase begins adding nucleotides at the 5' end of the template. If a cell were unable to produce histone proteins, which of the following would be a likely effect? A) There would be an increase in the amount of "satellite" DNA produced during centrifugation. B) Amplification of other genes would compensate for the lack of histones. C The cell's DNA couldn't packed into its nucleus. E) Pseudogenes would be transcribed compensate the decreased protein in the cell. E) Spindle fibers would not form during prophase. Why do histones bind tightly to DNA? A) Histones are highly hydrophobic, and DNA hydrophilic. B) Histones are positively charged, and DNA is negatively charged. C) Histones are negatively charged, and DNA is positively charged. D) Both histones and DNA are strongly hydrophobic. E) Histones are covalently are to the DNA.

Explanation / Answer

The answers are
40: B) Purines pair with pyrimidines.
As it is uniform in DNA, the dia of DNA is constiant.

41:A) A+C = G+T
Because A always binds with T and G always binds with C.

42: D) Adding numrous short DNA sequences such as TTAGGG which form a haripin turn

Telomerase have a inbuild RNA template.

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