Find below a list of questions some students have put together. I have typed them out for you‚ and I have also modified some of them‚ so I hope you don’t mind. Once you have printed the questions‚ fold the paper in half (lengthways)‚ and cut out the Q & A to test yourself MICROSCOPES AND MAGNIFICATION QUESTIONS AND ANSWERS What does resolution mean? The ability to distinguish between points that are close together What does magnification mean? The extent to which an image has been enlarged
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ACTIVITY 1: Simulating Dialysis (Simple Diffusion) Answers 1. The molecular weight of urea is approximately 60. Which of the membranes can it pass through? a. 50 MWCO membrane b. 100 MWCO membrane c. 200 MWCO membrane d. Both the 100 and 200 MWCO membranes D. Both the 100 and 200 MWCO membranes 2. True or False: A solution containing glucose will diffuse faster through a 200 MWCO membrane if it is heated. True 3. The molecular weight of carbon C is 12; the molecular weight of hydrogen
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Unit 1 Questions. Total: 16 marks 1. How many electrons does Mg2+ have? (1 mark) 10 electrons 2. Given that the half-life of the radioisotope carbon-14 is 5730 years‚ how useful do you think this isotope would be for dating bones that are over a million years old? (2 marks) 3. Summarize the four major types of biochemical reactions studied in this lesson. For each type give its name‚ a word summary of what happens during the reaction‚ and an example of where the reaction might be biologically important
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STUDY QUESTIONS FOR TEST 3 (Major concepts)—CHAPTERS 5‚ 6‚ 7 This study guide does not include everything you need to know for the exam. It an overview of main topics that I thought were important in lecture—make sure you’ve studied your book‚ completed the questions at the end of each chapter‚ answered all of the study guide questions‚ and taken the practice exam a few times! I would recommend either writing out the answers or‚ if you’re studying with someone else‚ talk through these questions.
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Osmosis in potato cells Aim: To view and examine the effect different concentrations of sucrose solution has on the movement of water across the cell membrane. Hypothesis: That the potatoes will either increase or decrease in mass‚ due to the effect of the different concentrations. Osmosis will occur. Apparatus: * Fresh potatoes * Apple corer * Scalpel * Petri dishes X 10 * 50ml measuring cylinder * Distilled water * Paper towelling * Sucrose solutions:
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20% and 25%) of sodium chloride increases. Potato slices placed in distilled water will have higher mass percentage due to the cells becoming turgid. BACKGROUND INFORMATION Diffusion is the movement of molecules from a hypertonic (high concentration solute) to the hypotonic (low concentration of solute). There are different types of diffusion one of which is osmosis. Osmosis is the movement of water molecules through a semipermeable membrane that allows only smaller molecules such as water to
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creating ion channels). Osmosis provides the primary means by which water is transported into and out of cells. The turgor pressure of a cell is largely maintained by osmosis‚ across the cell membrane‚ between the cell interior and its relatively hypotonic environment.[8] Jean-Antoine Nollet first documented observation of osmosis in 1748.[9] The word "osmosis" descends from the words "endosmose" and "exosmose"‚ which were coined by
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Chapter 3 Cell Structure and Function Section 3.1: Cell Theory: Cells are the smallest building unit of living organisms that can carry out all processes required for life. Almost all cells are too small to see without the aid of a Microscope. Although glass lenses used to magnify images for hundreds of years‚ they were not enough to reveal individual cells. The invention of Compound microscope was in the late 1500s by the Dutch eyeglass maker Zacharias Janssen. In 1665‚ the English scientist
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Plants cells behave differently in glucose solution of varying concentration by a process known as Osmosis. Plants cells will go flaccid or shrink in an hypertonic solution‚ a solution with low water concentration and high glucose concentration as water will move from the cell (high water concentration) to its surrounding. Turgid (swell up) in hypotonic concentration a solution with high water concentration and low glucose concentration due to water moving from surrounding high water concentration into
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hypothesis was that in from the 0.0 to 0.3 the weight of the potatoes will shrink and from 0.4 to 0.6 the potatoes will grow. If the potatoes absorb the sucrose and gain weight then they are hypotonic. But if the potatoes shrink then they are hypertonic. If they don’t change in size at all they are isotonic. Methods In Experiment 1‚ I measured the end of the dialysis bag with a ruler to 3 cm and folded. I pleated
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