Tick (v) if it is a true statement. Chapter 2 Cell Structure and Cell Organisation 1. The cell is the basic unit of life for all organisms. 2. All cells have the same shape and size. 3. All cells have a plasma membrane‚ nucleus and cytoplasm. 4. Protoplasm consists of a plasma membrane and nucleus. 5. The nucleus consists of chromosomes and a nucleolus. 6. Organelles that are found in the cytoplasm of a cell include the nucleus‚ vacuole‚ endoplasmic reticulum‚ mitochondria and Golgi apparatus.
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Nuclei at different stages 1. most vesicular nucleus‚ at interphase 2. Undergoing APOPTOSISnotice blebbing 3. Intermediate condensed nucleus 4. Less condensed nucleus 5. Anaphase 6. MOST CONDENSED Condensed/Hyperchromatic Nuclei: heterochromatin predominates low metabolic rate‚ low activity‚ http://studydroid.com/printerFriendlyViewPack.php?packId=62003 http://www.wadsworth.org/chemheme/heme/microscope/lymphocytes.htm Vesicular Nuclei: euchromatin predominates; indicates high
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Mitosis and Meiosis I. These two processes function to pass chromosomes from one cellular generation to the next in a very carefully controlled manner. II. Mitosis and Meiosis are both correctly described as nuclear division; they are never correctly called cell division‚ or any kind of reproduction. It is possible (and often quite normal) for nuclei to divide when cells don’t. And organisms reproduce; nuclei and cells divide. III. Mitosis A. Mitosis is the division of a nucleus
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point where a crossover occurs http://cyberbridge.mcb.harvard.edu/mitosis_6.html Metaphase 1 of meiosis During metaphase 1 every pair of bivalents (two chromosomes‚ four chromatids total) are put in line on the metaphase plate. This is a different mitosis metaphase‚ which is where all the chromosome are in a single file on the metaphase plate. The position are random. So basically the parental homolog appears on every side. Which means there is a possibility of a 50-50 chance for the daughter cells
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CHAPTER 2: CELLS Learning about disease is often simplified by growing it in a dish – some cells like heart and nerve cells however do not grow easily outside the body. Cellular reprogramming takes cell back to a state similar to stem cells and then coaxes them to specialize in a different way. Example – LEOPARD syndrome MIM 151100. Acronym for symptoms: enlarged heart w/blocked valves to the lungs‚ freckles‚ abnormal genitals‚ deafness. Skin cells taken from patients were reprogrammed to give
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There is two stages in M-phase; the first stage is called mitosis. Mitosis is the nuclear division of the cell‚ separating the two copies of the genome and forming daughter nuclei. There are four stages in mitosis: prophase‚ metaphase‚ anaphase and telophase. Multiple changes occur in prophase including the coiling of the chromatin into chromosomes‚ the disappearance of the nuclear envelope
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REVIEW FOR TEST 4: GENETICS CHAPTER 12 -1406 CHAPTER 8- 1408 MITOSIS 1. Define: genome‚ gene‚ chromosomes‚ chromatin‚ binary fission‚ homologous chromosomes‚ sister chromatids‚ daughter chromosomes‚ somatic cells‚ gametes‚ centromere‚ kinetochore‚ karyokinesis‚ spindle fibers‚ kinetochore microtubules‚ nonkinetochore microbules‚ centrosome‚ asters 2. List differences between eukaryotic and prokaryotic genome. 3. A chromosome consists of ____ (60%) and ____ (40%).
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meiosis II. 10. Evidence of crossing over can often be seen under the light microscope as an X-shaped structure known as ________. 11. The fusion of male gamete cells with female gamete cells is called A. syngamy B. meiosis C. mitosis D. recombination E. synapsis 12. Diploid organisms use meiosis for the development of gametes. Meiosis consist of how many rounds of nuclear division? A. one B. two C. three D. four E. answer not given 13.
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Cell division consists of two processes: mitosis and cytokinesis. Mitosis— division of the nucleus and its chromosomes— is divided into five phases:prophase‚ prometaphase‚ metaphase‚ anaphase‚ and telophase. Mitosis is followed by cytokinesis‚ when the cytoplasm splits to form two separate daughter cells. The cytoplasm of a cell in late interphase contains two centrosomes‚ each of which may contain a pair of centrioles. In the nucleus‚ the chromosomeshave been replicated during S phase‚ but are
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the tempo of their own division run amok‚ causing disease In a healthy body‚ cell division allows for: growth the replacement of damaged cells development from an embryo into an adult In sexually reproducing organisms‚ eggs and sperm result from: Mitosis Meiosis Cell Division and Reproduction 8.1 Cell division plays many important roles in the lives of organisms Organisms reproduce their own kind‚ a key characteristic of life Cell division is reproduction at the cellular level requires the duplication
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