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6. tRNA molecules have a triplet of bases responsible for bonding to specific amino acids
7. DNA is found in the nucleus, wound around histone proteins, but also in mitochondria
8. which base is purine and forms 3 hydrogen bonds
- guanine
- cytosine
- adenine
- thymine
9. What does Ligase do
- it catalyses the formation of DNA from activated deoxyribose nucleotides, using single stranded DNA as a template
- it catalyses the joining of the fragments of DNA produced from the lagging strand
- it catalyses the breaking of hydrogen bonds between pairs of nitrogenous bases in a DNA molecule
- it catalyses the untwisting of the DNA
10. The Genetic Code is:
- Degenerate
- all of them
- Universal
- Non-overlapping
11. Adenine + Thymine form ___ hydrogen bonds
12. The covalent bond between the sugar and the phosphate group in a nucleotide is a _______ bond
- ester
- phosphodiester
- peptide
- covalent
13. the bond between the deoxyribose molecule and the phosphate group is called a __________ bond
- hydrogen
- phosphodiester
- peptide
- ester
14. The purine bases are:
- Adenine + Guanine
- Cytosine, Uracil + Thymine
15. The pentose sugar for DNA is......
- amylose
- deoxyribose
- ribose
16. A purine always bonds with a pyrimidine
17. RNA polymerase catalyses the formation of temporary H bonds between RNA nucleotides and the complementary DNA bases
18. What does Helicase do
- it catalyses the breaking of hydrogen bonds between pairs of nitrogenous bases in a DNA molecule
- it catalyses the formation of DNA from activated deoxyribose nucleotides, using single stranded DNA as a template
- it catalyses the joining of the fragments of DNA produced from the lagging strand
- it catalyses the untwisting of the DNA
19. DNA replicates via ______________ replication
- dispersive
- semi-conservative
- conservative
20. DNA in prokaryotic cells is not wound around histone proteins, it is 'naked' DNA