50. Franklin s Crick\' X-Ray image of a DNA molecule contributed to Watson and s

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50. Franklin s Crick' X-Ray image of a DNA molecule contributed to Watson and s model by showing that a. the spacing between strands was somewhat uneven b. it was a double stranded helix with 2 anti-paralilel str c. the sugar-phosphat some nucleotides faced inwards e. that there were random e backbone was made as parallel strands while other faced outwards amounts of A &T;&C;&. 51.Semi-conservative replication implies that a. each new strand of DNA has some parental and some new material b. DNA polymerase IlIl synthesizes DNA. c. after synthesis, 1 DNA molecule is entirely parental, the other completely new. after synthesis, 1 DNA strand is entirely parental, the other completely new. d. e. DNA ligase has no role in DNA synthesis. Match the enzyme involved in DNA synthesis to its role. 52. Helicase ) A. links DNA ends together 53.Primase ) B. adds RNA nt's to initiate DNA pol binding 54.DNA Pol III C. removes primer and adds DNA nts. 55. DNA Pol ID. unwinds parental helix at replication fork 56. Ligase E. adds DNA (nts) using parental DNA template a. shorten telomeres. b. lengthen telomeres on the leading DNA strand. c. lengthen telomeres on the lagging DNA strand. d. repair mismatched base pairs. e. remove the RNA primer at the replication fork. 57. The role of telomerase is to a. proteins that assist in the winding of chromatin. b. carbohydrates that coat chromatin as it condenses c. lipids that keep the chromatin separate from the nuclear matrix. d. only found in bacteria. e. proteins attached to the extracellular matrix of cells. 58. Histones are

Explanation / Answer

Dear student,

Ans50

(B) that it was a double stranded helix with 2 anti-parallel strands.

Watson and crick made the famous discovery for the ds structure of dna.

But they got the initial insight after x ray diffraction results of Franklin.

Ans51- (D) one strand is completely parental, other is completely new.

Ans52:helicase- D (unwinds DNA)

Ans53: primase-B (adds RNA nt's ..)

Ans 54: DNA polymerase III- E

Ans55: dna pol1- C (removes primer)

Ans56: Ligase -A (links dna)

Ans57: C- lengthen telomere on lagging strand.

Ans58- A (histones wind chromatin ).

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