IBDP Biology 7.1 DNA structure and replication May 13, 2021 Shveta 0 Comments 7/7 and replications, Biology, DNA structure and replication, DNA structure and replications, Nucleic Acid Which letter (A–D) indicates where a new nucleotide would attach? ABCD2. Which structure found in eukaryotes has a single membrane? Nucleus Lysosome Chloroplast Mitochondrion 3. The diagram shows how pre-mRNA is processed into mature mRNA. Which structures are indicated by the letters W and X? ABCD4. Which is a valid comparison between prokaryotic and eukaryotic DNA? ABCD5. How does DNA replicate? The deoxyribose of a free nucleotide is linked to the phosphate of the last nucleotide in the chain. The phosphate of a free nucleotide is linked to the deoxyribose of the last nucleotide in the chain.Nucleotides are linked in a 3′ to 5′ direction and the new strands are anti-parallel to the template strands. Nucleotides are linked in a 5′ to 3′ direction and the new strands are parallel to the template strands. 6. What is a nucleosome?A region in a prokaryotic cell where DNA is found A DNA molecule wrapped around histone proteins A ribosome of a prokaryotic cell A molecule consisting of a sugar, a base and a phosphate 7. After which process are introns removed?Replication Transcription Translation Translocation 8. What does a nucleosome consist of ?DNA and histones DNA and chromatin Chromatin and nucleotides Mature RNA and histones 9. What are Okazaki fragments?Short lengths of RNA primase attached to the DNA during replication Short sections of DNA formed during DNA replication Nucleotides added by DNA polymerase I in the same direction as the replication fork Sections of RNA removed by DNA polymerase III and replaced with DNA10. What is the reason for Okazaki fragments being formed during DNA replication?To enable replication of the 3′ → 5′ (lagging) strand To form the template for the RNA primers To initiate replication on the 5′ → 3′ (leading) strand To help the DNA helicase unwinding the DNA helix 27 11. Which of the following forms the nucleosome? A. DNA and histone molecules B. DNA only C. RNA and histone molecules D. Histone molecules only 12. What happens during the formation of Okazaki fragments?DNA polymerase III adds nucleotides in the 3′→ 5′ direction. DNA polymerase III adds nucleotides in the 5′→ 3′ direction. DNA polymerase I adds nucleotides in the 5′→ 3′ direction. RNA polymerase adds nucleotides in the 3′→ 5′ direction. 13. The diagram below shows part of a DNA molecule that is being replicated. Where would DNA polymerase link the next nucleotide during replication?IIIIIIIV14. What are the fundamental packaging units of eukaryotic chromosomes?Nucleosomes Centromeres Histones Nucleoids 15. Which of the following chemicals is a component of eukaryotic chromosomes?Protein Triglyceride Fatty acid RNA