and animal cells have several differences and similarities. For example‚ animal cells do not have a cell wall or chloroplasts but plant cells do. Animal cells are round and irregular in shape while plant cells have fixed‚ rectangular shapes. Animal Cell Plant Cell Cell wall Absent Present (formed of cellulose) Shape Round (irregular shape) Rectangular (fixed shape) Vacuole One or more small vacuoles (much smaller than plant cells). One‚ large central vacuole taking up 90% of cell volume.
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Structure of Cells Monday‚ September 30‚ 2013 • Cytology ○ Cyto = cell ○ Logos = study of • Background ○ 1665 Robert Hook’s Micrographia § Was studying cork cells ○ 1833 R. Brown § Discovered nucleus ○ 1838 M. Schleiden § Said that all plants consist of cells ○ 1839 T. Schwann § All animals consist of cells ○ 1855 Virchow § Cells come only from preexisting cells • The Cell Theory ○ Cells are the structural units of all living things ○ Cells are
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___________________ Classification of Body Membranes Purpose: What is the purpose of this exercise? Is there any safety concerns associated with this exercise? If so‚ list what they are and what precautions should be taken. The purpose of this exercise is to be able to classify the membranes and learn about each. In this lab I will observe each membrane. Basically just getting to know each membrane better. Exercise 1: The Microscopic Structure of Cutaneous Membranes Observations: Draw your sketch
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1.A) Two main forms of cells exist: eukaryotic cells and prokaryotic cells. Prokaryotic cells are smaller and do not have membrane-bound nucleus or membrane- bound organelles‚ but do have: plasma membrane‚ cytosol and cytoplasm‚ and ribosomes. Prokaryotes contain much less DNA than eukaryotes and have circular chromosomes. Eukaryotic cells have information processing organelles‚ such as the nucleus which houses most of the cell’s DNA‚ and ribosomes which use information from DNA to produce proteins
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The primary xylem and primary phloem tissues are pushed inward into the] pith and outwards respectively by the continuous production of secondary tissues cut I off by the cambium ring. The primary xylem is gradually pushed inward and is found at the centre of the axis; whereas‚ the primary phloem‚ being soft in nature‚ gets completely crushed. These activities in the stelar region exert a great pressure outwardly. The cortex cells‚ the pericycle and the epidermis divide anticlinally to cope
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Cell Organelles Nucleus Its function is to control the cell’s activities and retain the chromosomes. The nucleus is bound by a double membrane‚ the nuclear envelope. The nuclear envelope has pores in it to allow the transport of mRNA. The cytoplasm like material is called nucleoplasm which contains chromatin (coils of DNA and histone proteins)‚ it is chromatin that condenses to form chromosomes during cell division. Within the nucleus is a small spherical body called the nucleolus which
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1. Which of the following is a major tissue type in the body? (p. 95) a. Epithelial b. Nervous c. Muscle d. Connective e. All of the above 2. Indicate where each major type of tissue can be found in the body (p.95) * Epithelial- covers body surfaces‚ cover and lines internal organs‚ compose glands * Connective- widely distributed throughout body * Muscle- attached to bones‚ in the walls of hollow organs‚ heart * Nervous-
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correct. High Power should show only a couple of cells that take up most of the viewing field. The micoscope is designed to view the slide at different spots‚ so not all drawings will look like this one. Images were snipped from the virtual microscope’s flash animation. Scanning (4) | Low (10) | High (40) | 3. Go to google and type "cheek cells" into the search box. Click on "images" to see all the images google has found on the web showing cheek cells (there should be hundreds). What do all of
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in complexity? A) ecosystem‚ population‚ organ system‚ cell‚ community‚ molecule‚ organ‚ organism‚ tissue B) cell‚ molecule‚ organ system‚ organ‚ population‚ tissue‚ organism‚ ecosystem‚ community C) organism‚ organ system‚ tissue‚ population‚ organ‚ community‚ cell‚ ecosystem‚ molecule D) molecule‚ cell‚ tissue‚ organ‚ organ system‚ organism‚ population‚ community‚ ecosystem E) ecosystem‚ molecule‚ cell‚ tissue‚ organism‚ organ system‚ organ‚ community Answer: D Topic:
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Chapter 4 Tissue: The Living Fabric 4.1 What are tissues? * Groups of cells that are similar in structure and perform a common or related function * There are four basic types of tissues: 1) Epithelial (covering) 2) Connective (support) 3) Muscle (movement) 4) Nervous (communication and control) * The study of tissues is known as histology 4.2 Preparing Human Tissue for Microscopy Requirements * Specimen must be fixed (preserved) * Specimen must be
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