RNA

Question 1

structural differences between dna and rna (6)

Answer 1

• dna is long and forms a double helix, whereas rna is short, straight and single stranded
• rna has ribose as a sugar whereas dna has deoxyribose
• rna has uricil (u) instead of thymine (t)
• dna is located in the nucleus, chloroplast and mitochondria whereas rna is located in the nucleus and cytoplasm
• dna is in the form of chromatin whereas rna is in the form of mrna, trna and rrna
• dna is a fairly stable molecule whereas rna is a very unstable molecule

Question 2

the types, structure and location of rna: messenger rna (mrna)

Answer 2

is copied from sections of dna in the nucleus and is used in the cytoplasm to manufacture protein

Question 3

the types, structure and location of rna: transfer rna (trna)

Answer 3

is produced from dna in the nucleus and is used in the cytoplasm to manufacture protein

Question 4

the types, structure and location of rna: ribosomal rna (rrna)

Answer 4

ribosomes are essential for protein synthesis. they are found free in the cytoplasm or attached to the tubules of the rough endoplasmic reticulum