leaves of vascular plants. The function of stomata is to allow gaseous exchange (transpiration) between the plant and the external environment (see diagrams below). This process is carried out by the plant‚ which controls the opening and closing of stomata via the guard cells. The more stomata a leaf contains the greater the rate of gas exchange and the less water it will be able to accumulate. Stomatal pores are formed between pairs of specialised guard cells. The wall adjacent to the stomata
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garden pea (Pisum sativum L.) and petunia (Petunia hybrida)‚ rms1 and dad1 respectively‚ revealed that a mobile signal produced in shoot and root inhibits shoot branching1‚2. For simplicity‚ we refer to this signal as SMS (shoot multiplication signal)3. SMS moves acropetally in shoots and inhibits lateral bud outgrowth4. On the basis of measurements of
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• Thin film of liquid surrounding soil particle -> dilute solution of mineral salts • Cell sap in root hair -> lower water potential than surrounding soil solution -> separated by partially permeable membrane • Water enter root hair cell by osmosis/active transport • Mineral salts -> diffusion and active transport [pic] How is the structure of root hair cell adapted to its function of absorption? • Elongated protrusion that increases surface area to volume ratio -> increase
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LAB 4: KIRCHHOFF’S RULES DIY Lab This section is adapted from reference 1. Objective In this experiment‚ you will experimentally verify Kirchhoff’s rules by measurement and by mathematical analysis. Apparatus (Lab Kit* or NIC Lab) 5 resistors one 6V battery or power supply (each under 1.5 kΩ each‚ not all equal) digital multimeter 12 connecting wires *If you do not have the Lab Kit‚ you can use equivalent items. Contact your instructor regarding equivalent items to ensure that the objective
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Evolution Lab: Finches and Natural Selection Antonio Joseph O. dela Merced Principles of Biology Instructor: Matthew Scholten Evolution Lab: Introduction Evolution is a natural process in which animals adapt to their surroundings so that they may survive. There are many variables in an animal’s environment that influence its evolution. The purpose of this lab is to examine finches from the island of Darwin and the island of Wallace and how the island size‚ finches’ clutch size and the
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materials which help our bodies function and removes the waste products that we do not need. 2 Cardiac cycle The cardiac cycle is the cycle of events that occurs as the heart contracts. There are two phases of the cardiac cycle. In the diastole phase‚ the heart ventricles are relaxed and the heart fills with blood. In the systole phase‚ the ventricles contract and pump blood into the arteries. 3 Lymphocytes Lymphocytes are the main white blood cells in the vertebrate system that is
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_______________________________________________________________________ A - your body remembers how to do what you practiced over the day. _______________________________________________________________________ Fueling the Body - Fats and Carbohydrates Q-how many calories are in 3 large hamburgers?_______________________________________________________________________ A - 3000
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Name: Mugabe Rodrigue Class: Grade 11B Subject: Biology Topic: DNA Extraction From Onion Date: 20/1/2014 Introduction: DNA‚ or deoxyribonucleic acid‚ is the hereditary material in organisms. Nearly every cell in an organism has the same DNA. Most DNA is located in the cell nucleus.The information in DNA is stored as a code made up of four chemical bases: adenine (A)‚ guanine (G)‚ cytosine (C)‚ and thymine (T). The order‚ or sequence‚ of these bases determines the information available for
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meiosis; 2. describe the behavior of the chromosomes during each stage of cell division; 3. identify specific events in mitosis and meiosis that allow the inheritance of traits and generation of variation. MATERIALS A. Microscopic Examination Compound microscope cover slip Prepared slides of onion root tip (Allium cepa) 45% HAc Onion bulb alcohol lamp Farmer’s Solution (acetic acid-ethanol=1:3) 70% ethanol bent needle acetocarmine stain (2%) glass slide
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Biol GOD Notes. First Edition 1 L. Leong 2012 Chapter 1: Molecules of Life Cell Theory ∝ All living things are composed of cells and the products of cells ∝ Cells are the basic functional unit of life ∝ All cells arise from pre-existing cells Living Things Unicellular: consisting of one cell Multicellular: composed of many cells ∝ All living things: grow and develop‚ regulate metabolic processes‚ move‚ respond to stimuli‚ reproduce AUTOTROPHS: manufacture their own organic carbon compounds
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