DNA

Question 1

describe the structure of a DNA mononucleotide

Answer 1

a deoxyribose molecule, phosphate group and an organic base joined together by condensation reactions

Question 2

describe how DNA molecules join together to form a DNA polymer/strand

Answer 2

condensation reaction between the sugar of one nucleotide and the phosphate of the next one

(phosphodiester bond)

Question 3

describe how RNA mononucleotides join together to form an RNA polymer/strand

Answer 3

phosphodiester bonds between a phosphate and a sugar

Question 4

describe how DNA forms a double helix

Answer 4

-In a DNA molecule there are 2 polynucleotide strands twisted around each other
-they form a double helix
-the sugars and phosphates are on the outside (hydrophillic phosphate groups on the very outside of the molecule
-the bases point inwards and are joined by H bonds
-2 polynucleotide strands antiparallel as they run in opposite directions

Question 5

describe the structure of an RNA mononucleotide

Answer 5

a phosphate, ribose sugar and uracil base