You isolate a cell from a yeast species (a eukaryote) where n = 8, apply a chemical that forces chromosomes to condense, and then make a karyotype. You observe a cell with 16 DNA molecules. The stage of this cell: (A) [Select] [Select] (B) Select] and each chromosome is made up of [Select] [Select] be G1 of the cell cycle, because at that stage the cell is (C) [Select] and so has [Select] [ Select] and each chromosome is made up of [Select] and so has [Select] be Metaphase of Mitosis, because at that stage the cell is chromosomes and so has [Select] chromatid(s). and each chromosome is made up of [Select] chromosomes be Prophase II of Meiosis, because at that stage the cell is chromatid(s). chromosomes chromatid(s),

A researcher, who is examining a sample of cells of the same types at different stages of cell division, isolates a group of cells in the sample that have 1.5 times the amount of DNA as cells at the G1 phase. Which of the following best describes this group of isolated cells? A B с D They are in the M phase of the cell cycle. They are between the G1 and the S phases in the cell cycle. They are in the S phase of the cell cycle. They are in the G2 phase of the cell cycle.

In a dividing cell, the duplicated sets of chromosomes move along microtubules to opposite ends of the cell. How would you use an inhibitor to show that microtubules are essential for chromosome separation?  What control treatment(s) would you use? What kind of cell junctions would you expect to find, and why, in a small animal where a chemical signal passes rapidly through cells to go from the head to the tail?

One approach to studying the regulation of cell cycle progression (particularly in an era when genetic and molecular biology manipulations were less readily accomplished in mammalian cells) was to use treatments that induced cells to fuse and then monitor the behavior of the two nuclei in the resulting cell. The figure below depicts data from one such study.  The investigators did preliminary work to produce populations of cells that were synchronized in various stages of the cell cycle (G1, S, or G2 in the examples shown below). They then fused the cells in different combinations and monitored subsequent events in each of the nuclei. For purposes of this question, we will pay particular attention to what occurred in the nucleus that came from the cell in G1. In one experiment (I), cells in the G1 and S phases were fused.  That event caused the nucleus from the G1 cell to very quickly enter the S phase (sooner than it would otherwise have done so).  In contrast, in a second experiment…

You isolate a cell from a eukaryotic species where n = 14.  The cell contains 28 DNA molecules. choose best answer from the bolded words in each phrase: 1. The cell could/could not be at the end of stage G1 of the cell cycle, as the cell in this stage is   diploid/haploid and each chromosome is made of 2/1 DNA molecule(s). 2. The cell   could/could not be at the end of stage Metaphase I, as the cell in this stage is   diploid/haploid and each chromosome is made of     2/1 DNA molecule(s). 3. The cell   could/could not be at the end of stage Prophase II, as the cell in this stage is    diploid/haploid  and each chromosome is made of    2/1  DNA molecule(s).

In which stage(s) of the cell cycle, mitosis or meiosis  do each of these processes occur (multiple stages apply to some) Crossing-over:  Chromosome supercoiling:  Separation of sister chromatids:  DNA synthesis:  Chromosome reduction from 2N to N:    4. A previously undiscovered single celled organism was found living at a great depth on the ocean floor. Its nucleus contains only a single, linear chromosome consisting of  7x10^6 nucleotide pairs of DNA coalesced with three types of histone-like proteins. The analysis of individual nucleosomes revealed that each unit contained one copy of each protein and that the short linker DNA had no protein bound to it If the entire chromosome consists of nucleosomes (discounting any linker DNA), how many are there and how many total proteins are needed to form them?

Why do eukaryotic cells need to go through the elaborate procedure of mitosis rather than simply dividing during interphase? Select as many answers as apply. 1.Daughter cells must be genetically identical to the mother cell, for homeostasis and ordered tissue growth.  2.Bivalent chromosomes must condense and be separated in an orderly fashion, to allow equal distribution of copies into daughter cells 3.Physically dividing the nucleus during interphase would likely lead to gross chromosome breakage and highly unequal assortment of genetic information into daughter cells. 4.Dividing the nucleus during interphase would have the same outcome as mitosis 5.Daughter cells must have half the number of chromosomes after mitosis than the mother cells 6.The homologous pairs of chromosomes need to be separated, to ensure copies go to the daughter cells.