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- How does DNA replication occur in a precise manner to ensure that identical genetic information is put into the new chromatid? See Figures 8.12 and 8.13. FIGURE 8.12 In DNA replication, the two polynucleotide strands uncoil, and each is a template for synthesizing a new strand. A replicated DNA molecule contains one new strand and one old strand. This mechanism is called semiconservative replication. FIGURE 8.13 A close-up look at the process of DNA replication. (a) As the strands uncoil, bases are added to the newly synthesized strand by complementary base pairing with bases in the template strand. The new bases are linked together by DNA polymerase. (b) DNA synthesis can proceed only in the 5 3 direction; newly synthesized DNA on one template strand is made in short segments and linked together by the enzyme DNA ligase.What difference exists between the compaction of chromosomes during metaphase versus interphase? Give at least one reason why this difference may be necessary.For S phase to be completed in a timely manner, DNA replication must be initiated from multiple origins in eukary-otes. In S. cerevisiae, what role do S phase CDKs and DDKs play to ensure that the entire genome is replicated once andonly once per cell cycle?
- For S phase to be completed in a timely manner, DNA replication must be initiated from multiple origins in eukaryotes. In S. cerevisiae, what role do S phase CDKs and DDKs play to ensure that the entire genome is replicated once and only once per cell cycle?Across 12. 9.) one of two idéntical halves of a replicated chromosomes 15 17 12.) the structure that forms during cytokinesis in plants separating the two daughter cells 8 9. 10 13.) the condition of halving more than two sets of chromosomes per. 11 12 13 |14 Down 4.) the complex of DNA and prótein that makes up eukaryotic chromosomes 15 16 17 18 5.) the condition of having one set of chromosomes (n) per nucleus 19 20 7.) the chromosome complex formed by the synapsis of a pair of homologous 4.Consider the figure beow, which depicts chromatin within the neucleus of a eukaryotic cell. nucleus O The letter A indicates regions of a single chromosome which are not expressed, and the letter B indicates regions of a single chromosome which are expressed. O Both answer choice A and answer choice B are correct. The letter A indicates regions of a single chromosome which are condensed and attached to the nuclear lamina, and the letter B indicates regions of a single chromosome which are partially decondensed. O Answer choices A, B and C are all correct. O The letter A represents repressed TADS, and the letter B represents active TADS.
- Across framework for chromosome movement during cell division 2. 4 5. 19.) the stage of cell division in which the cytoplasm divides to form two daughter cells 10 20.) chromosomes that are similar in. morphology and genetic constitution 11 12 14 Down 13 14.) repeating units of chromatin structure, each consisting of a length of DNA wound around a complex of eight histone molecules 15 16 17 18 19 17.) The division of the cell nucleus resulting in two daughter nuclei, each with the same 203) Examine the graph showing the relative percentage normal and cancer cells spend in various stages of the cell cycle. Based on the information in the graphs, infer how cancer cells differ from typical, noncancerous cells. Select ALL that apply. A) Cancer cells do not replicate their DNA. B) Cancer cells replicate their DNA too quickly. C) Cancer cells do not go through interphase during their cell cycle. D) Cancer cells spend more time dividing compared to typical cells. E) Cancer cells do not always grow to the same size as typical cells. more than 1 answer. not gradedOrigins of replication, centromeres, and telomeres are all involved in replication and segregation of chromosomes. Classify each statement below under the structure it describes. Each mammalian cell contains 10,000 of these, scattered through the chromatin of the nucleus. As a cell divides successively, this structure is prone to shortening in the absence of an enzyme that lengthens it; shortening puts a limit on how many times a particular cell is able to divide. If an average human chromosome had only one of these, its replication would take more than a month. Origin of replication Reset Certain proteins unwind the DNA double helix here to create mirror- image replication forks. In humans, this component consists of the sequence TTAGGG repeated 250-1500 times, depending on the cell type. This component can occur almost anywhere on a chromosome, except at the very ends. Telomere This structure is found at the ends of linear chromosomes. Cleavage of the cohesin complex of this…
- 30. Mitotic chromosomes are A) 103 B) 104 105 D) 100 times more compact than a DNA molecule in its extended form. 31. Find the mismatched pair: A) DNA protein-coding regions-transcribed as RNA open reading frames ori sequence-origin of replication in both bacterial and eukaryotic chromosomes C) telomeres terminal (end) sequences of eukaryotic chromosomes D) centromeres-constricted region of a chromosome where mitotic spindle proteins bind HO -0. OHDiscuss the differences between the compaction levels of metaphase chromosomes and those of interphase chromosomes. Whenwould you expect gene transcription and DNA replication to takeplace, during M phase or interphase? Explain whyDifferentiate centromere, centrosomes, centrioles, and kinetochore. Explain in a detailed manner. Provide some sample scenarios.