surface area compared to volume‚ such as the biggest cube‚ then there would be hardly any surface area to exchange materials through substances. Another reason why cell division might take place is due to the increase in surface area of volume ratio. Mitosis helps the cell by keeping it in the original size and ensuring that diffusion is performed easily and thus resulting in the cell working
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Feb. 10/13 Lab 7 Diversity of Photosynthetic Organisms Observation of marine and fresh water algae Identification of lichens Study of leaf tissue cells Quiz next week. Feb. 17 President’s Day Feb. 20 Lab 5 The Cell Cycle: Mitosis – simple cell division Meiosis – formation of reproductive cells. Individual labeled diagrams due at end of lab. Feb. 24/27 Lab 10 Responsiveness and Behavior Experimentation of human senses: touch‚ taste‚ smell‚ hearing and vision.
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INTRODUCTION Levels of organization (cell to biosphere) and characteristics of life Levels: Cells->tissue ->organs & organ systems->organisms->populations->communities->ecosystems-> biosphere Characteristics of life: Cell and Organization: Each cell can only do the job it is tasked with. Example: brain cells Energy Use and Metabolism: Energy is needed many organisms. Energy is utilized in chemical reactions Response to Environmental Changes: responds to stimuli Regulation and Homeostasis: ex:
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Chapter 2: Patterns in Nature 1. Cell theory • 1590: Dutch grind glass lens (1st compound microscope) • 1665: Robert Hooke uses compound m. analysis thin cork slices as filled with air enclosed in boxes (cells) distinct • 1676: Dutch sees microorganism under microscope from pond water • 1824: French suggest all organisms composed of cells • 1827: Robert Brown (Brownian motion) discovered nucleus in plant cell • 1838: German produced evidence that all organisms made of cells • 1859:
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nonfunctional. What kind of effect would this mutation have on a skin cell in the area of a cut? Selected Answer: a. The cell would be unable to reproduce itself. Question 5 2 out of 2 points In meiosis‚ as opposed to mitosis‚ Selected Answer: e. pairing of homologous chromosomes occurs. Question 6 2 out of 2 points Which of the following statements about DNA replication and cytokinesis in Escherichia coli is true? Selected Answer:
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ronmentWhat you absolutely need to know for the Regents Exam! The LE Exam consists of approximately 70-75 questions worth a total of 85 points. The exam is broken down into 4 parts: Part A: General knowledge multiple choice questions (30 points) Part B: A mix of multiple choice and short answer‚ dealing with the application of knowledge. So far‚ Part B has always required students to draw a graph. (25 points) Part C: Short answer questions dealing with your ability to apply material learned in
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PSBPP103 Differential Gram’s staining EXPERIMENT NO. 1 AIM: THEORY: Page No: C1 Date: To Gram stain the given bacterial suspension and to differentiate between gram positive and gram negative organism. Visualization of microorganisms in the living state is very difficult‚ not just because they are minute‚ but because they are transparent and almost colorless when suspended in an aqueous medium. To study their properties and divide microorganisms into specific groups for diagnostic purposes
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Shaffer‚ and Soto with additions and changes by Stephanie Trewhitt and Dr. Shannon Bros-Seemann San Jose State University INDEX Week Date Lab Topic Page 1 Aug 25 Lab safety‚ microscope use‚ adding course Lab 1 2 Sept 1 Cell Life cycle - mitosis/meiosis Evolutionary I Lab 2 3 Sept 8 Plant Evolutionary History I Lab 3 4 Sept 15 Plant Evolutionary History II 5 Sept 22 Adaptation and Diversity: An introduction to the Molluscs Lab 4 6 Sept 29 Mendelian genetics - Virtual Lab
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Unit1: Cell functions/ Cell division Cells Cell theory: -All living things are composed of one or more cells. -The cell is the smallest entity that retains the properties of life. -New cells arise only from cell that already exists. Structure of the cell: The outer boundary (plasma membrane) similar to a city wall It is constructed with molecules called lipids (fat and oils) The cell membrane is composed of: -Proteins and Lipids -FUNCTION: to allow molecules into and out of the
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have no organized nucleus but instead they their DNA clumped in an area but there is no organized nucleus with a membrane. This is because prokaryotes don’t have mitosis or meiosis like other cells. Scientists don’t really have a good way of describing how they duplicate‚ but it’s not through normal means. It is sometimes called simple mitosis. On the other hand eukaryotes have a nucleus which contains the DNA and the information necessary to grow reproduce and function. The Information is stored in
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