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Sunday, August 30

  1. page Viruses, Prions, and Viroids Oh My! edited ... The only exception is viruses which are not composed of cells but are said to be "living&…
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    The only exception is viruses which are not composed of cells but are said to be "living".
    Viruses:
    Viruses are a microscopic infectious agent that can reproduce only inside a host cell. They are found in almost every ecosystem on earth and are the most abundant type of biological entity on the planet. All viruses have genes made from either DNA or RNA. All have a protein coat that protects these genes. They are an important means of horizontal gene transfer which increases genetic diversity. Plant viruses are often transmitted from plant to plant by insects that feed on sap. Animal viruses cab be carried by blood-sucking insects. For example influenza viruses are spread by coughing and sneezing.
    Prions:
    Prions are an infectious agent that is composed of protein. The protein does not itself self-replicate and the process is dependent on the presence of the polypeptide in the host organism. All known prion diseases affect the structure of the brain or other neural tissue.
    Viroids:
    Viroids are plant pathogens that consist of RNA without the protain coat that is typical for viruses. The human pathogen hepatitis D is similar to viroids.
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    5:55 pm
  2. page Human Body Systems edited ... This system consists of glands that release hormones into the body regulating metabolism, grow…
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    This system consists of glands that release hormones into the body regulating metabolism, growth, development, punerty,tissue function, and even mood. Some of the major glands are pineal(female), pituitary(male), thyroid, thymus, adrenal(m), pancreas(f), Ovary(f), and testes(m).
    Reproductive:
    This system is in charge of reproduction. The major organs of the human reproductive system include the external genitallia (penis and vulva) as well as a number of internal organs including the gamette producing gonasds (testicles and ovaries).
    Respiratory:
    This system allows for a gas exchange. Include airways, lungs, and the respiratory muscles. Molecules of oxygen and carbon dioxide are passively exchanged, by diffusion, between the gaseous external environment and the blood. This exchange process occurs in the alveolar region of the lungs
    Excretory:(urinary)
    This system removes excess materials from the organism.Since the normal operation of most biological systems creates waste, the excretory system is not necessarily distinct from other systems. Instead, it often represents the various excretory processes of several different systems.
    Immune/Lymphatic:
    This system protects against disease.
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    4:12 pm
  3. page Human Body Systems edited ... This system takes food and extracts the nutriens then expells what is left. Includes mouth, es…
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    This system takes food and extracts the nutriens then expells what is left. Includes mouth, esophagus, small and large intestines.
    Nervous:
    This system is a network of cells that communicates information of its surroundings. Composed of nuerons, central and peripheral nervous system, nerve cord, spinal cord, and the brain.
    Endocrine:
    This system consists of glands that release hormones into the body regulating metabolism, growth, development, punerty,tissue function, and even mood. Some of the major glands are pineal(female), pituitary(male), thyroid, thymus, adrenal(m), pancreas(f), Ovary(f), and testes(m).
    Reproductive:
    This system
    Respiratory:
    Excretory:(urinary)
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    4:06 pm
  4. page Human Body Systems edited Integumentary: This protects the body from damage and includes skin, hair, scales, and nails.it h…
    Integumentary:
    This protects the body from damage and includes skin, hair, scales, and nails.it has a variety of functions; it may serve to waterproof, cushion and protect the deeper tissues, excrete wastes, regulate temperature and is the location of receptors for pain, sensation, pressure and temperature. In humans the integumentary system additionally provides vitamin D synthesis.
    Muscular:
    This system allows a species to move.The muscular system in vertebrates is controlled through the nervous system, although some muscles(such as the cardiac muscle) can be completely autonomous.
    Skeletal:
    This system is the framwork that provides protection.The average adult human skeletoon has around 206 bonees. These bones meet at joints, the majority of which are freely movable. The skeleton also contains cartilagge for elasticity. Ligamentts are strong strips of fibrous connective tissue that hold bones together at joints, thereby stabilizing the skeleton during movement.
    Circulatory:
    This system passes nutrients like gases, hormones, blood cells, and waste products to and from the cells to help fight disease and maintain homeostasis. Includes the heart, blood, and blood vessels.
    Digestive:
    This system takes food and extracts the nutriens then expells what is left. Includes mouth, esophagus, small and large intestines.
    Nervous:
    Endocrine:
    Reproductive:
    Respiratory:
    Excretory:(urinary)
    Immune/Lymphatic:

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    3:57 pm
  5. page Darwin's Theory and Lamarck's ideas edited ... {darwin_finches.jpg} Lamarck's Ideas regarding evolution: Lamarck's idea is that an organi…
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    {darwin_finches.jpg}
    Lamarck's Ideas regarding evolution:
    Lamarck's idea is that an organism can pass on characteristics that it acquired during its lifetime to its offspring. Also known as heritability of acquired characteristics or soft inheritance.
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    3:28 pm
  6. page Darwin's Theory and Lamarck's ideas edited Evolution is the change in the gene pool of a population in response to various stimuli by a speci…
    Evolution is the change in the gene pool of a population in response to various stimuli by a species over time.
    Darwin's Theory of Evolution:
    Darwin went to the Galapagos Islands and saw that many of the islands had their own unique species of finch. Each of the finches had a beak and body well adapted to the kind of food found on its particular island. They were all different species but looked very similar. Darwin realized that they had evolved from a common ancestor. He proposed that originally a few seed-eating finches had flown to the islands from the mainland. Over millions of years the birds adapted to the foods available on each island and evolved into separate species.
    {darwin_finches.jpg}
    Lamarck's Ideas regarding evolution:

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    3:24 pm
  7. 3:24 pm

Sunday, August 16

  1. page Incomplete Dominance edited Incomplete dominance is a type of inheritance in which one allele for a specific trait is not comp…
    Incomplete dominance is a type of inheritance in which one allele for a specific trait is not completely dominant over the other allele. This results in a combined phenotype (expressed physical trait).
    For example, if you cross pollinate red and white snapdragon plants, the dominant allele that produces the red color is not completely dominant
    over the recessive allele that produces the white color. The resulting offspring are pink.
    {in._dom..jpg}

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    2:18 pm
  2. file in._dom..jpg uploaded
    2:18 pm

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