Question

prepare a model of the DNA and give a presentation based on it

Answer 1

i.Two long polynucleotide chains are coiled forming a right handed double helix.

ii. The two chains are antiparallel i.e., C-5' to C-3' orientations run in opposite directions.

iii. The bases of both chains are flat structures lying perpendicular to the axis; they are "stacked" on one another, 34 A(0.34 nm) apart, on the inside of the double helix.

iv. The nitrogeneous bases of opposite chains are paired as the result of the formation of hydrogen bonds.

v. Each complete turn of the helix is 34 A (3.4 nm) long.

vi. A large major groove alternating with a smaller minor groove winds along the length of the molecule.

vii. The double helix has a diameter of 20 A (2.0 nm).

Answer 2

prepare a model of the dna and give a presentation based on it