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Examples of where Biology reflects your everyday life |
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Sleep, Wake, Daily routine
Dentist, doctor
Pets, Children
Food, Drink, Drugs, Smoking |
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7 Characteristics of Life |
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Presence of Carbon
Organization and Complexity
Metabolism
Homeostasis
Response to Stimuli
Reproduction
Growth |
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Cells
Tissures
Organs
Organ systems
Organisms
Populations
Communities
Ecosystems
Biosphere (the earth) |
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Kingdom Monera
Kingdom Protista
Kingdom Fungi
Kingdom Plantae
Kingdom Animalia
Exception: viruses |
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Three Tenets of the Cell theory |
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1) all living things are composed of cells
2) the cell is the basic functional unit of life
3) all cells arise from previously existing cells |
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Three Basic Components of all Cells |
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Cell Membrane - Boundary between interior of cell and exterior
Cytoplasm - everything outside the nucleus (if present) and within the cell membrane
DNA - Deoxyribonucleic acid - The hereditary material that contains info to direct cell reproduction and other processes |
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No nucleus or membrane bound organelles (endoplasmic reticulum, mitochondria, plastids, or golgi bodies) The cells of bacteria and blue-green algae are prokaryotic |
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Has a distinct nucleus surrounded by a nuclear membrane |
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Control center of the cell; contains DNA which regulates cell activity and controls heredity |
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One or more may be present; contains RNA and helps in the preparation of the ribosomes |
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Composed of DNA; Contain the blueprint for life; number present ranges from 1 in some insestial worms to hundreds in some ferns. Humans have 23 pairs |
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Regulates movements of materials in/out of the cell |
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Everything outside the nucleus within the cell membrane, a complex solution including granules, droplets, rod-like and threadlike bodies and membranes |
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Membrane system for the movement of various materials in the cell; the site of chemical reactions, sometimes lined with ribosomes (site of protein synthesis) |
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Membrane system formed of flattened sacs; prepares and packages materials to be used in the cell (digestive enzymes); most abundant in cells that secrete (pancreas cells secrete digestive enzymes) |
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Sacs of digestive enzymes that are involved in intracellular digestion; abundant in lung tissue where they act as scavengers, ingesting and digesting "worn out" cell parts; can burst and digest the entire cell they are in; known as "suicide bags" or "garbage disposal units"
Not found in plant cells |
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Power house of the cell; site of cellular respiration; ATP molecules made here for storage of energy |
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Bundle of microtubles used in mitosis
Not in Plant Cells |
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found throughout the cell; aid in movement of organelles, cell movement, maintenance of cell shape; make up cillia and flagella |
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Cell Wall - contains cellulose; gives shape and rigidity
Plastids - (chloroplast) site of photosynthesis, contain green pigment (chlorophyll II)
Large Vacuoles - well developed for storage, small or absent in animal cells |
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The division of one cell producing two cells exactly like the original cell |
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a reduction division, by which gametes are produced. One cell produces four cells with half the chromosome humber, using two cycles of division. Production of gametes (egg/sperm) |
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A group of diseases characterized by uncontrolled growth and spread of abnormal cells |
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How do cancer cells differ from normal cells? |
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They do not respond to body signals to stop dividing (loss of contact inhibition) may be "immortal" |
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Process by which a normal cell changes into a cancerous cell |
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3 stages of cancer/cancer summary |
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1) Initiation
2)Promotion
Tumor Formation
Benign/malignant
3)Metastis
(death) |
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First stage of cancer - induction of a normal cell to become cancerous
*a cancer causing agent (carcinogen) induces normal cells to become cancerous, permanent DNA damage |
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2nd stage of cancer - cancer cells keep dividing without control
*cells are stimulated to undergo uncontrolled growth (division). cells are no longer subject to the body's normal controls on cell division
**This is the stage where Tumor formation happens |
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3rd stage of cancer - cancer cells spread to other locations in the body
** cancer cells enter the blood and lymph systems and are carried throughout the body. New cancers appear far from original initiation site. Cancer is now considered "advanced" |
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a "localized" tumor which usually causes little harm to the individual |
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tumor growth continues, invading and destroying neighboring tissues. Cancer is now considered "regional" and may induce an immune response to slow the spread of the tumor |
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1) Environmental conditions
2) Radiation
3) Viruses
4) Hereditary
5) Many other causes |
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contains all necessary information to direct cell reproduction and other processes
DNA is negative (-) |
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**Electric current repels/attracts mixture of DNA fragments through the microscopic pores in the gel from the negative to the positive electrode
**Gel is made from agarose
**DNA separates by shortest,smallest fragments moving fastest and move to the bottum of the gel. Longer, slower fragments remain at the top of the gel
**DNA can be viewed by staining with dye |
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Examples of applications of DNA fingerprinting |
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Forensic science
paternity testing
genetic testing
evolutionary studies |
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Basic structure of the double helix |
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Ladder like fashion twisted to form a double helix. Each chain is composed of an outer backbone of alternating sugar and phosphate molecules attached to an inner series of repeating unites called bases A-G....T-C
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DNA makes up chromosomes
Humans have 23 pairs |
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ribonucleic acid
Synthesizes (makes) these proteins using the ribosomes in cytoplasm of cell |
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an international research project aimed at constructing a detailed map of the human genome |
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During meiosis, chromosomes are organized into homologous pairs. members of a pair have identical sequence of genes |
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functional unit of heredity |
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those genes, which occupy the same position on each member of a homologous pair.
The two alleles can be identical or alternative forms of the same gene |
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Homozygous vs Heterozygous |
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Homozygous - have 2 identical alleles for genes
Heterozygous - have 2 different alleles for genes |
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Dominant - When 2 different alleles are present, one allele is expressed in the phenotype and the other is suppresed. The expressed allele is said to be dominant over the suppressed (recessive) allele. |
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Genotype - specific allelic combination in an organism
Phenotype - the observable properties of an organism which are under genetic control |
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Complete Dominance vs Incomplete Dominance |
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Complete Dominance - possession of the dominant genotype in either the homozygous or heterozygous state results in expression of the dominant trait in the phenotype
Incomplete Dominance - the heterozygote possesses a phenotype which is intermediate between those of the homozygotes |
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trait is determined by 2 or more genes, each with 2 alleles. the effect is often additive, i.e. the greater the number of alleles involved, the greater the level of expression will be |
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an individual can only have 2 alleles for a given gene, however, more than 2 alleles for a gene may exist in the general population
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is composed of Blood cells andplasma |
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part of the immune system. antibodies recognize and attach to foreign antigens in the blood and cause clumping of blood cells. the clumping is called agglutination |
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inheritance of the Rh factor follows the standard dominant - recessive pattern Rh (+) is the dominant trait, Rh (-) is recessive. The Rh factor also has antigen-antibody reactions |
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Gametogenesis and the 2 types |
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gametes are the products of meiosis and are produced throught gametogenesis
1)Spermatogenisis
2)Oogenisis |
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primary male sex organ(s) in which immature sperm are produced. The testes are composed of many tubules called the seminiferous tubules, and are located outside the body in the scrotum.
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the testes are composed of many tubules called Seminiferous tubules, and are located outside the body in the scrotum |
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a coiled duct that connect the testes to the vas deferens; immature sperm are transported from the testes to the epididymis when they mature |
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a coiled duct that connect the testes to the vas deferens; immature sperm are transported from the testes to the epididymis when they mature |
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a muscular tube that carries sperm to the exterior of the body through the penis |
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glands of the male reproductive tract that produce roughly 60% of the volume of semen; release a fluid high in sugars, providing energy for sperm
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gland of the male reproductive tract, contributing roughly 1/3 of the volume of semen; secretes an alkaline fluid which neutralizes the acidity of the woman’s vagina. |
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