RNA

Question 1

State the components of RNA

Answer 1

• A single stranded polynucleotide
• pentose sugar ribose
• nitrogenous purine bases adenine and guanine
• nitrogenous pyrimidine bases cytosine and uracil no thymine

Question 2

What is mRNA function and where is it made

Answer 2

• messenger RNA
• synthesised in the nucleus
• carries genetic code from the DNA to the ribosomes in the cytoplasm
  Different mRNA have different lengths related to the lengths of the gene from which they are transcribed

Question 3

What is rRNA where is it made and what is its function

Answer 3

• ribosomal rRNA
• found in the cytoplasm
• comprises large complex molecules
• made up of rRNA and protein
• the site of translation of the genetic code into protein

Question 4

What is tRNA

Answer 4

• transfer RNA
• small single stranded molecule
• folds so in places there are base sequences forming complementary pairs
• 3’ end of the molecule has the base seq CCA where the specific amino acid the molecule carries is attached
• it also carries a seq of three cases called the anticodon at the bottom of the molecule
• function - transport specific amino acids to the ribosome in protein synthesis .