Molecular biology

6. – An enzyme that relieves torsional stress (supercoiling) created by DNA unwinding.
10. – The stage of transcription containing the transcription bubble where RNA polymerase binds the promoter.
12. – Short DNA fragments synthesized discontinuously on the lagging strand.
13. – The enzyme that joins Okazaki fragments together to form a continuous strand.
14. – Loosely packed chromatin where genes can be expressed.
15. – The process of removing introns from the pre-mRNA transcript.

1. – The enzyme that extends the 3' ends of linear chromosomes to prevent shortening.
2. – Replication where each new DNA molecule contains one parental strand and one newly synthesized strand.
3. – The specific region on DNA including the TATA box where RNA polymerase binds.
4. – The tail of adenosine nucleotides added to the 3' end of a mature mRNA.
5. – The enzyme responsible for unwinding the DNA double helix.
7. – A non-coding sequence removed from the pre-mRNA by the spliceosome.
8. – The enzyme that synthesizes the short RNA primers needed to start replication.
9. – A DNA sequence where activator proteins bind to signal that a gene should be transcribed.
11. – Proteins that DNA wraps around to form bead-like structures called nucleosomes.