slides carefully. Wash your hands after handling the prepared specimens. Materials: Compound light microscope Glass microscope slide with prepared onion root tip specimen Purpose: understand and identify the stages of the cell cycle and mitosis. apply an analytical technique to estimate the relative length of each stage of the cell cycle. Hypothesis: What do you predict you will find about the number of cells in each of the phases of the cell cycle? Provide an explanation for your
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to combine to the cdk. 14. C E CDK is the protein maintained at a constant levels throughout the cell cycle that requires cyclin to become catholically active. 15. E B The MPF tigers the cell’s passage past the G2 checkpoint into mitosis because it recognizes it and the it either allows it to leave the G2 checkpoint or it sends it to the G0 checkpoint‚ 16. A B As cells become more numerous‚ the cell surface proteins of one cell contact the adjoining cells and they stop dividing
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replication does not occur again before meiosis II. However‚ meiosis I is the "reduction" division when a diploid cell forms two haploid cells. If the DNA duplicated before meiosis I‚ how do the daughter cells become haploid? DNA must replicate before mitosis or meiosis can occur. If daughter cells are to receive a full set of genetic information‚ a duplicate copy of DNA must be available. Before DNA replication occurs‚ each chromosome consists of a single long strand of DNA called a chromatid. When a
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Biology Exam 2013 - Review UNIT: PATERNS OF INHERITENCE Describe Mendel’s experiments: * Chose a female parent; chooses a male parent; pollen is collected from the stamens and dusted onto the female parent stigma; pollen fertilizes the eggs. The ovary develops into the pod and eggs develop into the peas; when peas are planted they develop into pea plants. Why Pea Plants? * Easily obtained * Grown quickly; several generation of peas can be observed * Traits are easily visible
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4.1.1 State that eukaryote chromosomes are made of DNA and proteins.(1) State means to give a specific name‚ value or other brief answer without explanation or calculation. The chromosome is composed of two main molecules. a) DNA b) Proteins called histones. This image was taken shortly after DNA a replication but before the prophase. It is composed of two daughter chromatids joined at the centromere. The chromosome is super coiled by a factor around x16‚000. The DNA molecule is about 1
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robosomes ‚proteins in rough er in ribosomes stroma is liquid in between thylacoid membrane Chemestry Know essential elements for plants and animals. PH= the negative log of H+ ion concentration in water. Equation. Subtract from 14 Mitosis divides the nucleous 4 phases: prophase: chromosomes condense metatphase: line up on eqator anaphase: pull apart telephases: nuclear membrane forming. 2 daughter cells 46 chromosomes in parent cell‚
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Centre No. Candidate No. Paper Reference(s) Surname Initial(s) Signature 4325/2H Examiner’s use only London Examinations IGCSE Biology Paper 2H Team Leader’s use only Higher Tier Wednesday 11 May 2005 – Morning Time: 2 hours Question Leave Number Blank 1 2 3 4 5 Materials required for examination Nil Items included with question papers Nil 6 7 8 Instructions to Candidates In the boxes above‚ write your centre number and candidate number‚ your surname
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Observing Argumentation In the 21st century‚ people are very set in the stereotypical thoughts that society implants in their heads. Many people don’t like to step out of their comfort zone when it comes to values and stereotypes. In both stories‚ I personally think the theme is that everyone should step out of the thoughts that they are used to and be more open-minded about the world. In Fatema Mernissi’s article “Digital Scheherazade; The Rise of Women as Key Players in the Arab Gulf Communication
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HOW CAN CANCER CELLS BE RECOGNIZED? NAME: _______________________________ DATE: __________________ BLOCK: _______ Purpose: In this investigation you will explore the similarities and differences between the cell cycles of normal cells and cancer cells. Procedure: 1. Open your Internet Browser and navigate to the following URL: http://glencoe.mcgraw-hill.com/sites/0078695104/student_view0/unit2/chapter9/virtual_labs.html 2. Click on CELLULAR REPRODUCTION TV/VCR 3. Click on the TV/VCR. a. b.
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SBI3U1-04 Final Exam Study Notes Unit 1: Diversity of Living Things 1.1 Importance of Biodiversity Spotlight on Honeybees Very important‚ pollinate flowers allowing plants to reproduce Play vital role in food chain‚ if they die‚ all organisms that rely on them will die as well Dying because of pesticides‚ parasitic Varroa mite (infects beehives and sucks of bees’ blood)‚ the Israeli acute paralysis virus (immobilizes and kill bees) No genetic diversity = Less resistant to parasites
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