The DNA and associated proteins of a eukaryotic chromosome are called Chromatin Chromatosome Nucleosome Ribosome
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- Discuss the levels of chromosomal organization with reference to the following terms: a. nucleotide b. DNA double helix c. histones d. nucleosomes e. chromatinEukaryotic chromosomes contain two general types of organization that relate to the degree of condensation. Different parts of the chromosomes have different levels of condensation during interphase. Which of the following eukaryotic chromosome structures would be the least likely to contain actively transcribed genes? Oeuchromatin 10-nm fiber Onucleolus centromerePlace the following eukaryotic DNA structures in order of thickness, smallest to largest heterochromatin double helix nucleosomes 30 nm chromatin fibre looped domain
- Chromatin of eukaryotes is organized into repeating interactions with protein octamers called nucleosomes. Nucleosomes are composed of DNA and multiple histone proteins cohesins telomerase kinetochore proteinsWhich of the following statements is TRUE? None of these are TRUE Interphase chromosomes are loosely compacted, overlapping, and intertwined with each other within the nucleus. Radial loops in the condensing chromosome are formed due to interactions between 30 nm fibers and the scaffolding proteins of the nuclear matrix - producing the 300 nm fiber of the chromosome Interphase chromosomes are loosely compacted and do not associate with histones until the cell is preparing to divide. Interphase chromosomes are also known as euchromatin. Condensed, metaphase chromosomes are also known as heterochromatin.Which of the following statements is TRUE? O Interphase chromosomes are loosely compacted, overlapping, and intertwined with each other within the nucleus. O Interphase chromosomes are loosely compacted and do not associate with histones until the cell is preparing to divide. O Interphase chromosomes are also known as euchromatin. Condensed, metaphase chromosomes are also known as heterochromatin. O Radial loops in the condensing chromosome are formed due to interactions between 30 nm fibers and the scaffolding proteins of the nuclear matrix - producing the 300 nm fiber of the chromosome O None of these are TRUE
- A chromosome with a centromere located at its terminal end is termedPut the following levels of chromosome organization in order from least complex (least packaged form) to most complex (most packaged form). DNA strand 30-nm fiber Heterochromatin EuchromatinMatch the description on the left with the correct term on the right When the nuclear membrane dissolves andy the chromosomes appear Options: When the nuclear membranes reform and visible chromosomes go back to less coiled Prophase chromatin Metaphase Chromosomes line up along the midline of the Telophase cell Anaphase When sister chromatids separate and move to opposite sides of the cell
- 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.Origins 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…Draw and label G1 and G2 stages of interphase and each stage of mitosis (in order) for a cell that has two large and two small chromosomes, 2n=4. For unreplicated chromosome draw a line ( / ) and for replicated chromosome draw an X. Since we are focusing on the DNA, you can skip drawing the nuclear membrane or spindle fibers. For simplicity, do not indicate that the chromosomes are decondensed chromatin during interphase. Mark and label a place on one of the large chromosomes with the dominant allele of the “A” gene and put the recessive allele “a” on the other homolog. Mark and label a place on one of the small chromosomes with allele “B” and put the recessive allele “b” on the other homolog.
