The difference between observed values and expected values is not significant. C. The change in one variable is not correlated with a change in another variable. D. The difference between the means in two samples is not significant. (Total 1 mark) 3. The lengths of a sample of tiger canines were measured. 68% of the lengths fell within a range between 15 mm and 45 mm. The mean was 30 mm. What is the standard deviation of this sample? A. 5 mm B. 15 mm C. 7.5 mm D. 30 mm (Total 1 mark) 4. What
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Respiration: How Cells Harvest Chemical Energy 1. A cell must work just to maintain its complex structure‚ for order is intrinsically unstable. Because of entropy (the second law of thermodynamics)‚ which states that any enclosed system tends toward disorganization‚ cells must constantly use energy to keep themselves in order. If the cell was to stop using energy and let itself go then it would eventually get so disorganized that it wouldn’t function properly. 2. With the help of enzymes‚ the cell systematically
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Cell Reproduction Eric Gonzalez Strayer University Week 4 Lab Professor Lynn Roginsky 22 Jul 11 Cell Reproduction The goal of this week’s lab is to explore the effects cancerous cells can have on tissue in the lungs‚ stomach‚ and ovaries. Using a microscope and slideshow and based on readings in the lab the following are answers to questions asked in the experiment. Based on the data gathered from observation differences in normal cells and cancerous ones have revealed themselves. Most
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Defense Mechanisms Denial: Refusal to accept reality. Difficulty accepting what is true. Ex) My family could not accept the fact that my niece was diagnosed with a fatal‚ cancerous brain tumor. Displacement: Emotion pointed on something that brings lesser risk. Ex) When I got my first F in school I went and told my mom instead of my dad because she takes things lighter. Intellectualization: Focusing on only intellectual parts of a situation to avoid direct emotional ties
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CHAPTER 36 PLANT CELLS The first barrier to form between daughter cells is the middle lamella. Daughter cells expand to their final size and make polysaccharides for a primary wall. After expansion stops waterproofing materials are added for a secondary wall. Water and dissolved materials move from cell to cell by way of pit pairs. A pit is a thin spot in the primary wall where the secondary wall is absent or separated from the primary wall by a space. Strands of cytoplasm called
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landlocked. Nevertheless‚ the lack of unhindered access to the sea adds transport costs and time to international trade transactions. In addition‚ landlocked countries face greater transport risks and hazards than countries which have direct access to international sea routes. The United Nations has addressed the specific concerns of landlocked countries in a number of documents. Among those which are directly related to transport are the following: General Assembly resolution 50/97 of 20 December
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AP Chemistry Dr. Istone Lab 3: Gravimetric Analysis of a Metal Carbonate Lab Objective: In this lab we will determine the identity of a group 1 metal carbonate compound by gravimetric analysis. The unknown is weighed and dissolved in water and the precipitate is filtered‚ dried‚ and weighed. From the data the formula weight and identity of the unknown metal carbonate is determined. Lab Procedure: 1. Set up the Bunsen burner and ring clamp‚ light the burner and heat the crucible
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Control mechanisms – Local + CNS Higher CNS centers (cerebral cortex‚ limbic system‚ hypothalamus)-> brain stem -> spinal cord -> respiratory system To control respiration‚ what cells should you actually control? -control skeletal muscles involves in inhalation and exhalation These cells control respiratory minute volume – how do you control them? -respiratory minute volume involves the freq. and volume of a respiratory cycle -motor neurons control skeletal muscle -both voluntary
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Substitute lab for Unit 6 lesson 3: Stoichiometry: Counting by Measuring Mass Purpose Determine the mass of several samples of chemical elements and compounds and use the data to count atoms. Procedure Start Virtual ChemLab and select Counting by Measuring Mass from the list of assignments. The lab will open in the Calorimetry laboratory. Part 1‚ Measuring Metal 1. Click on the Stockroom. Click on the Metals sample cabinet. Open the top drawer by clicking on it. When you open the drawer‚ a
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Determining Standard Reduction Potentials‚ Equilibrium Constants and Investigating a Lead-Acid Electrolytic Cell Purpose Experimental Methods All procedures were followed according to the lab manual (experiment 10 – Electrochemistry Laboratory). Data and Observations Part A: Grams of FeSO4 used: 0.759 Voltage during voltmeter and battery check: 9.23V Table 1. Electrochemical Cells Data Part B: Table 2. Lead-Acid Battery Results and Calculations In order to make 5ml of
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