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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Page 1 of 8 BIOLOGY 12- CELL STRUCTURE & FUNCTION Chapter Notes THE CELL THEORY • Although different living things may be as unlike as a violet and an octopus‚ they are all built in essentially the same way. The most basic similarity is that all living things are composed of one or more cells. This is known as the Cell Theory. • our knowledge of cells is built on work done with microscopes • English scientist Robert Hooke in 1665 first described cells from his observations of cork slices
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separates eukaryotes from prokaryotes is the presence of _______ in eukaryotic cells. A) ribosomes B) oxidative phosphorylation C) DNA molecules -D) a nucleus 2. Cytoplasmic organelles are - A) absent in prokaryotic cells; present in eukaryotic cells. B) present in both prokaryotic and eukaryotic cells. C) present in prokaryotic cells; absent in eukaryotic cells. D) absent in both prokaryotic and eukaryotic cells. 3. Eukaryotic chromosomes contain _______ DNA molecules. A) single
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2.1 Cell Theory 2.1.1 Outline the cell theory The three main principles of the cell theory are: * All organisms are composed of one or more cells * Cells are the smallest units of life * All cells come from pre-existing cells New Concepts * Cells contain the blueprint for their own growth‚ development and behavior * Cells are the site of all the chemical reactions needed to sustain life * Cells (and multicellular organisms) show emergent properties – appears as complexity
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Biology – Assignment One Cells. Question One Explain the roles of the main components and features of a cell to the cell function. A typical animal cell is rounded in shape‚ surrounded by a cell membrane. This holds in the cytoplasm‚ which contains other structures such as the nucleus‚ ribosomes‚ and mitochondria. Each cell has tiny structures inside called organelles; each type of organelle performs a particular function. For example there are mitochondria (power stations)‚ ribosomes (protein
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Julia Foster Mr. Kinney American Culture Honors 14 March 2014 Animal Soldiers “Do you give [a] horse its strength or clothe its neck with a flowing mane? Do you make him leap like a locust‚ striking terror with his proud snorting? He pauses fiercely‚ rejoicing in his strength and charges into the fray. He laughs at fear‚ afraid of nothing‚ he does not shy away from the sword. The quiver rattles against his side‚ along with the flashing spear and lance. In frenzied excitement he eats up the ground
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Stem cells agreement by Zayne Burnham Many scientists are now researching special types of cells called stem cells. Stem cells are very important and have the potential to cure many diseases; however there are also many issues to consider when using stem cells. Stem cells research has created concern for some in the community‚ national and international.beacause the best source of stem cells is growing human embryo. The dilemma is that the growing embryo is the earliest stage of human life extracting
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ANIMAL SMUGGLING Imagine walking through a American airport and you notice a woman’s skirt flapping up and down. At first thought you think nothing of it‚ but at second glance you you see feathers falling to the floor and two beautiful toucan parrots trying to make a last chance escape from the airport. One would think this never happens‚ but in all actuality these toucan parrots were drugged with dangerous tranquilizers and are a long ways from home. These birds are just a fraction of the ten billion
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Animal Cruelty I choose this topic because animals really fascinate me. Since I was kid‚ I always had a pet dog. Her name is Lolita and I would break down if anything happened to that innocent puppy. I think animals are a treasure to this world. They help us understand each other. They may not be able to reason like us but that doesn’t mean they don’t feel anything. They feel pain‚ fear‚ sadness‚ happiness. They are animals‚ we are animals. We may look different but we should all take care of
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If you were of the opinion that cultivated plants and domesticated animals is what wildlife consists of‚ you are mistaken. Wildlife‚ in fact‚ comprises of the innumerous varieties of wild plants‚ animals‚ fungi and microorganisms that exist on our planet earth‚ rather than just cultivated plants and domesticated animals. Knowingly or unknowingly‚ we largely depend on this wildlife for every elementary requirement in our life. The food we eat‚ the clothes we wear‚ the medicines we consume‚ a variety
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