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HERE
HERE

... Living cells are dynamic and have several things in common. A cell is the smallest unit that is capable of performing life functions. All cells have an outer covering called a cell membrane. A living membrane is made of one or more layers of linked molecules. Inside every cell is a gelatinlike mater ...
File
File

... 3. The terms in order of increasing complexity are tissue, organ, and system. 4. Answers will vary. Examples of tissue include nerve tissue, muscle tissue, and connective tissue. Examples of organs include skin, heart, liver, lungs, stomach, and intestines. Examples of systems include the circulator ...
Respiration
Respiration

... Two kinds: ...
Cell Membrane
Cell Membrane

... Adenosine Triphosphate (ATP) - one of the principal chemical compounds that living things use to store and release energy. Made in the MITOCHONDRIA by CELLULAR RESPIRATION. ENERGY!!!!!!! Adenosine Diphosphate (ADP)-reduced when an ATP molecule looses one of its phosphate molecules ...
Presentation
Presentation

... • The spinal cord controls reflexes. – sensory neuron sends impulse to spinal cord – spinal cord directs impulse to motor neuron – does not involve the brain interneuron ...
fundamental unit of life biology
fundamental unit of life biology

... Plastids are small bodies found free in the cytoplasm of most plant cells. They are absent in bacteria, fungi, cynobacteria. There are three types of plastids – 1. Chloroplasts:- The green plastids are called chloroplasts. They are meant for photosynthesis as they contain chlorophyll. They are gener ...
+ Biology  I.  Biology  = the study of life
+ Biology I. Biology = the study of life

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Viruses & Bacteria

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Study of Developmental Biology using Zebrafish
Study of Developmental Biology using Zebrafish

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The Respiratory System Student worksheet
The Respiratory System Student worksheet

... 34. What is the inflammation of the pleural membrane called? What causes it? What are the symptoms? /3 35. Infection of the tonsils is called _________________________. /1 36. Inflammation of the larynx is __________________ and symptoms include ____________ and ________________. /3 37. Inflammation ...
Biology 231
Biology 231

... Neural Tissue – detects changes in internal and external environment and responds by transmitting signals to other tissues to maintain homeostasis or cause a response 2 cell types: neurons – detect stimuli, create nerve impulses; composed of a cell body, with fibrous processes neuroglia – support n ...
Topic 4: Human Body Page 1 Base your
Topic 4: Human Body Page 1 Base your

... Topic 4: Human Body Base your answers to questions 8 through 12 on the information below, and on your knowledge of biology.      A student has a sandwich for lunch. The bread contains starch molecules and various other molecules. After chewing and swallowing some of the sandwich, the starch moves a ...
Biology EOC Review Packet - Watchung Hills Regional High School
Biology EOC Review Packet - Watchung Hills Regional High School

... specific functions. 2. In living things structure relates to function on cellular to an organismal level. Cellular processes are carried out by many different types of molecules, mostly by the group of proteins known as enzymes. 3. Cellular function is maintained through the regulation of cellular p ...
Cellular Organization - Bremen High School District 228
Cellular Organization - Bremen High School District 228

... Understand how prokaryotic cells, eukaryotic cells (whether of animals or plants and whether unicellular or multicellular), and viruses differ in complexity and structure. In particular: 1. Prokaryotes are organisms whose cells lack nuclei. They are usually small and unicellular. 2. Eukaryotes are o ...
The Respiratory System
The Respiratory System

... 33. What is the inflammation of the pleural membrane called? What causes it? What are the symptoms? /3 34. Infection of the tonsils is called _________________________. /1 35. Inflammation of the larynx is __________________ and symptoms include ____________ and ________________. /3 36. Inflammation ...
Animal Structure and Function
Animal Structure and Function

... Compare and contrast cartilage, bone, tendons, and ligaments . 6. Learn the basic structure of muscle and the three different types and their function. 7. Learn the structure of nerves and their function. 8. Define an organ and the organization of different tissues within. 9. Learn the 10 organs sys ...
6th Grade Science Post Test Study Guide ANSWERS Write out a
6th Grade Science Post Test Study Guide ANSWERS Write out a

... 33) Mitochondria – powerhouse of a cell; changes food into usable energy to provide energy for a cell 34) Vacuole – stores water, minerals, food; very large in plant cells because plants need to store more water, fills with water to keep plants from wilting 35) Chloroplast – performs photosynthesis; ...
The Tissue Level of Organization
The Tissue Level of Organization

... Description: single layer of columnar cells but the position of the nuclei make it appear as there are many layers; often ciliated Functions: Protection and secretion Locations: lining of nasal cavity, trachea and bronchi and portions of male reproductive tract ...
Ch 10 Notes - Mitosis
Ch 10 Notes - Mitosis

... other cells. Then they stop growing. – If you remove cells, the cells will divide again until they touch other cells. ...
File
File

... 3. Write the word equation for photosynthesis: Carbon dioxide, water and sunlight react in the chloroplast to produce glucose and oxygen. 4. What is needed for photosynthesis to happen (these are the reactants)? Carbon dioxide, water and light 5. What is made by photosynthesis (these are the product ...
Human Body Systems
Human Body Systems

... What Benefits Do Gut Bacteria Provide? • Bacteria are very useful to the human digestive system because they produce enzymes that digest the polysaccharides in plant cell walls. When we eat plant material, some of it contributes to the fiber in our diet, which is good for a healthy colon, but withou ...
The Respiratory System
The Respiratory System

... membrane lining the respiratory tract from the nasal cavity (and sinuses) to the bronchioles  epithelial layer is comprised predominantly of ciliated, simple columnar epithelial cells, with mucous-secreting goblet cells interspersed ...
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Cell theory



In biology, cell theory is a scientific theory which describes the properties of cells. These cells are the basic unit of structure in all organisms and also the basic unit of reproduction. With continual improvements made to microscopes over time, magnification technology advanced enough to discover cells in the 17th century. This discovery is largely attributed to Robert Hooke, and began the scientific study of cells, also known as cell biology. Over a century later, many debates about cells began amongst scientists. Most of these debates involved the nature of cellular regeneration, and the idea of cells as a fundamental unit of life. Cell theory was eventually formulated in 1838. This is usually credited to Matthias Schleiden and Theodor Schwann. However, many other scientists like Rudolf Virchow contributed to the theory. Cell theory has become the foundation of biology and is the most widely accepted explanation of the function of cells.The three tenets to the cell theory are as described below: All living organisms are composed of one or more cells. The cell is the most basic unit of life. All cells arise from pre-existing, living cells, by biogenesis.
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