Cell Structure

• Organisms are made up of cells.
• Most organisms are multicellular and have cells that are specialised to do a particular job.
• Microscopes are needed to study cells in detail.
• The limits of the light microscope are around 0.05 mm.
• Animal cells are between 0.01 mm – 0.05 mm.
• Plant cells are between 0.01 mm – 0.10 mm.
• The human eye can see objects as small as around 0.05 mm.
• A microscope is required to see cells in any detail.
• In microscopy, a whole organism, cells, tissues, a small piece of tissue, or other structures, such as hair, pollen grains, are viewed with a microscope so that it appears larger.
• The type of microscope used in a school laboratory is a compound microscope.
• A compound microscope uses two lenses, the objective lens and the eyepiece.
• The very short focal length objective lens produces a greatly-magnified image, then the short focal length eyepiece magnifies this further.
• The magnification of a lens is shown by a multiplication sign followed by the amount the lens magnifies, for example, ×10.
• The formula to calculate magnification is: magnification = size of image/real size of object.
• The magnification of the microscope is calculated by multiplying the magnification of the eyepiece by the magnification of the objective, for example, if the magnification of an eyepiece is ×10 and the objective is ×4, the magnification of the microscope is: magnification of eyepiece × magnification of objective = 10 × 4 = 40.
• The compound microscope uses two lenses to magnify the specimen – the eyepiece, which has a longer focal length than the objective lens, and the objective lens, which has a very short focal length and produces a greatly magnified image of the specimen.
• In a compound microscope, the lens closest to the specimen has a very short focal length and produces a greatly magnified image of the specimen.
• Magnification in a microscope can be varied according to the size of the specimen and the level of detail required.
• Microscopes use lenses to magnify the image of a biological specimen so that it appears larger.
• Cells and cell structure activities include creating a class PIN, quiz, drag and drop, multiple choice, sentences, fill in the blanks, shuffle, pairs, hangman, and more.
• Cells and cell structure quiz includes topics such as cell division, transport in cells, digestive system, heart and blood, health issues, plant tissues, organs and systems, communicable diseases, drugs, plant disease, photosynthesis, respiration, and more.
• Investigative skills in biology include maths in science, homeostasis, nervous system, hormones, reproduction, variation and evolution, ecosystems, biodiversity, trophic levels, food production, and more.
• Cells and cell structure quiz includes life processes, prokaryotic and eukaryotic cells, animal and plant cells, animal and plant cells (2), cells and cell structure, bacterial cells vs plant cells, using a light microscope, preparing a slide, viewing microscope slides, using a light microscope, microscopy, light microscope vs electron microscope, using a microscope, specialised cells (2), cell differentiation, cells, tissues, organs and organ systems.
• Cells and cell structure quiz includes key points, matching, and flashcard>
• Cells and cell structure quiz includes anagrams, shuffle, and flashcard>
• Cells and cell structure quiz includes multiple choice, drag and drop, matching, quiz, sentences, and flashcard>
• Chemistry investigative skills include states of matter, elements, compounds and mixtures, atomic structure, the periodic table, bonding and structure, quantitative chemistry, reactivity of metals, reactions of acids, electrolysis, exothermic and endothermic reactions, and more.
• The structure of the Earth, the eye, the kidney, the nephron, the tooth, subduction, sulfur removal, summer, surface area of cube, surface area to volume ratio, survival of the fittest, sustainable development, synapse, table of results, tar on cilia, tertiary alcohols, terylene, test for aldehydes - Fehlings, test for aldehydes -Tollens, test for proteins, test for starch, test for sugar, testing a component, testing a leaf for starch, testing alkenes with bromine water, testing an alarm clock in a vacuum, testing drugs, testing for alkenes, testing for carbon dioxide gas, testing for chlori
• Biological weathering is a type of weathering that occurs due to microorganisms.
• There are 23 pairs of chromosomes in humans.
• Atmosphere quiz and atmosphere wordsearch can be used to test knowledge of the atmosphere.
• Bond enthalpy is the change in bond energy due to a change in bond length.
• Atom economy is the efficiency of the use of atoms in a chemical reaction.
• Area under a graph can be calculated using a formula.
• Asymmetrical alkenes and HBr are types of chemical reactions.
• Antitoxins are substances that neutralize toxins.
• Acceleration is the change in velocity over time.
• Alkene molecules can have different numbers of double bonds.
• Too little water can lead to ADH (alcohol dehydrogenase) activity.
• Too much water can lead to ADH (alcohol dehydrogenase) activity.