Replicated DNA gets shorter at each cycle of replication but

Replicated DNA gets shorter at each cycle of replication, but telomeres ensure that the DNA lost is not essential. the loss of DNA at the ends of replicated strands takes place because of the nature of DNA replication involving the: a. Both leading and lagging strands b. leading strand c. Lagging strand d. RNA primers on both leading and lagging strands. The theoretical number of 3-nucleotide codons possible, given that there are 4 types of nucleotides, is calculate as a. 4 times 4 times 4 b. 3 times 3 times 3 times 3 c. 4 times 3 d. 4 + 4 + 4 Which statement is true regarding H_1 histones: a. are essential for the formation of the 10nm fiber b. are not part of the core nucleosome c. form dimers before assembly d. are acetylated in euchromatin In mammals, chromosome X inactivation in females is an example of: a. constitutive heterochromatin b. facultative heterochromatin c. X-ray generated translocation d. spreading of heterochromatin from the centromere During RNA splicing, a lariat is formed when the 5\' end of the intron forms a bond with a nucleotide within the \"branch\" through: a. an unusual 5 degree C to 3 degree C triphosphate linkage b. an unusual 5 degree C to 2 degree C triphosphate linkage c. an unusual 5 degree C to 5 degree C triphosphate linkage d. an unusual 5 degree C to 2 degree C phosphodiester bond

Solution

10. the cap attached to an unusual 5 prime to 5 prime c triphosphate linkage. in eukaryotes it is found on 5 prime end of mRNA.

11. the loss of DNA at the end of replicated strand take place due to nature of DNA replication to involve the LAGGING strand.beause there at the end there are short streach of DNA not covered by OKAZAKI FRAGMENT; because primer will fall at the end of the strand.

12. the throritical number of 3 nucleotides codons possible from four nucleotides are= 4 *4*4=64. the formula is 4 to the power n, here n=3.

13.the statement true about H1 HISTONE IS- are essential for formation of 10nm fibre,forms dimers before assembly.