2.5 Mononucleotide, DNA & RNA structure & H bonds in double helix

polynucleotide

What polymer is formed from mononucleotides?

deoxyribose sugar, phosphate, nitrogenous base

3 components of a mononucleotide

They are held in pairs by hydrogen bonds

Why do the bases point inwards in the double helix?

-DNA is double-stranded, whereas RNA is single stranded

-DNA contains deoxyribose sugar whereas RNA contains ribose sugar

-DNA contains thymine bases whereas RNA contains uracil bases

Describe the differences between the structure of DNA and the structure of RNA (3)

-both contain nucleotides

-both contain phosphodiester bonds and have hydrogen bonds between bases

-DNA is double stranded and double helix whereas tRNA is single stranded and folded

-DNA contains deoxyribose/thymine whereas tRNA contains ribose/uracil

-tRNA has a specific amino acid binding site whereas DNA does not

Compare and contrast the structure of a DNA double helix with the structure of tRNA

-Double stranded helix

-Phosphate and deoxyribose sugar backbone

-Joined by phosphodiester bonds

-A-T and C-G held together by hydrogen bonds

Describe the structure of DNA (4)

-DNA is double stranded whereas mRNA is single stranded

-DNA has deoxyribose sugar whereas mRNA has ribose sugar

-DNA has A-T and C-G bases, whereas mRNA has A-U and C-G bases

-Both DNA and mRNA have phosphodiester bonds

Compare and contrast DNA structure to mRNA structure (4)

No

Is DNA single stranded in bactera?