up to 1000x o For viewing living cells • Electron microscope (EM) has magnification up to 1,000,000x o Scanning EM (SEM) for viewing surface features o Transmission EM (TEM) for viewing internal structures [pic][pic][pic] B. Why are cells small? • A cell’s surface area-to-volume ratio limits its size • Volume increases faster than Surface Area • Larger cells do not have enough Surface Area to support
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Assignment 1, Anatomy and Physiology for Health and Social Care Nucleus The majority of cells in the human body contain a nucleus but not all nuclei are the same as there are many variations. The nucleus has the largest spherical structure within the cell, and is known as the ‘brain of the cell’ because the nucleus controls all of the cell’s activity, such as: reproduction of cells and movement. The nucleus contains strands of DNA (chromosomes) in the form of a double helix. Within
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applied topics which study the ways in which plants may be used for economic benefit in horticulture, agriculture and forestry and organismal topics which focus on plant groups such as algae, mosses or flowering plants. Core topics Cytology — cell structure, chromosome number Epigenetics — Control of gene expression Paleobotany — Study of fossil plants and plant evolution Palynology — Pollen and spores Plant biochemistry — Chemical processes of primary and secondary metabolism Phenology — timing of
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Chapter 6 A Tour of the Cell This chapter introduces the topics of microscopy and cell fractionation, followed by a review of the cell and the major organelles and structures of eukaryotic cells. A challenge with this chapter is to keep this data from simply being a list of parts. In addition to the structure and function of individual organelles, questions probe student understanding of the cell as a dynamic, interconnected system: the flow of membrane and proteins in the endomembrane system to
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Internet address: http://moodle.concordia.ca Grading Scheme 5 • Midterm • In-class Activity/Assignment • i>clicker • Final exam 30% 12% 3% (starts Jan 20th) 55% Final exam will cover the entire course (cumulative) 6 CELLS AND ORGANELLES Lecture 1 BIOL 266/4 2014-15 Dr. S. Azam Biology Department Concordia University What does it mean to be living? 7 • Cells distinguish living organisms from non living things • All living organisms are made up of cells • Cells
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into several different parts and in the eukaryotic cell one very important part is the nucleus. The person who first discovered this organelle was a botanist called Robert Brown (1773-1858). The nucleus is the most prominent organelle found in eukaryotic cells; it takes the form of a sphere like shape, and is often found towards the middle of the cell. The main structure of the nucleus is formed by a nuclear envelope, which is made up from two parallel running membranes known as the inner and outer
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characteristics; this means liver cells are is different from muscle cell and is different from a fat cell. It is also the largest and most prominent organelle in the cell; it is a specialized subunit in the cell that has a specific function. As the nuclear envelope isolates and protects a cell’s DNA from various molecules that might damage the structure or its processing this when DNA is synthesized special RNA (Parker and Honeysett, biology, 2008). The nucleolus produces ribosome’s, which move out
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Nucleus- This organelle is the control center of a Eukaryotic cells. The Nucleus is surrounded by a nuclear envelope composed of two membranes. The nucleus also include nuclear pores that allows a paced stream of proteins, RNA, and other molecules to move into and out of the nucleus to the rest of the cell. Inside the Nuclear envelope, there is a layer of chromatin that consist of DNA bounded with protein; as chromatin condenses, it forms chromosomes that is used to pass hereditary information.
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AS Biology: OCR Syllabus Module 1.1.1 3.1 AS Unit: Cells, Exchange and Transport Module 1: Cells 1.1.1 Cell Structure Candidates should be able to: (a) state the resolution and magnification that can be achieved by a light microscope, a transmission electron microscope and a scanning electron microscope; Light Microscope Transmission Electron Microscope Scanning Electron Microscope Resolution 0.2 μ (200nm) 0.2nm 0.2nm Magnification ≈ ×1500 / 2000 Over 500
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Out of all the organelles there are two that have fascinated microbiologists for the past hundred years. The first is the mitochondria, nicknamed the "powerhouse of the cell." The second is the chloroplast in plant cells that have functions similar to those of the mitochondria. What do these organelles do? untitled Essay of Eukaryotic Organelles ... What are the similarities and differences of these organelles? This essay will help you to understand these two fascinating organelles. II. Mitochondria
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