Which of the following bondsinteractions will survive when a

Which of the following bonds/interactions will survive when a 83 base-pairs long double-stranded DNA is denatured? a) Hydrogen bond b) Ionic bond c) Van der Waals interaction d) Hydrophobic interaction e) None of the above bonds

A deletion mutation in a viral DNA resulted in loss of 20 nm length of DNA. How many helical turns are missing? a) 6 b) 20 c) 34 d) 60 e) 200

In gel electrophoresis, the migration of DNA molecules is unaffected by a) Size of DNA b) Shape of DNA c) Strength of electric field d) Strength of gel e) None of the above

In biological macromolecules, the following two non-polar groups most commonly participates in the formation of hydrophobic interactions a) N-H and O-H b) N-H and C-H c) C-H and C-C d) C-H and O-H e) C-C and O-P

Solution

Which of the following bonds/interactions will survive when a 83 base-pairs long double-stranded DNA is denatured?

Answer is Ionic bonds.

All other bonds are weak and are broken when denatured. Hydrogen bonds are between the strands of a double straded DNA. Denaturation by defenition is separation is double stranded into single stranded DNA.

A deletion mutation in a viral DNA resulted in loss of 20 nm length of DNA. How many helical turns are missing?

Length of one helix is 34 Å (angstroms). Each helix contains approximately 10.4 base pairs. 1 nano meter is equal to 10 Angstroms.

Answer is option D.60

In gel electrophoresis, the migration of DNA molecules is unaffected by

Shape of DNA.

In biological macromolecules, the following two non-polar groups most commonly participates in the formation of hydrophobic interactions

N-H and O-H