Notes, abstracts, papers, exams and problems of Biology

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Mitosis and Meiosis

Classified in Biology

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Mitosis: is a dynamic, continuous and very complex whereby the nuclear material is duplicated and then divided and shared equally between the daughter cells.
Phases of mitosis: interphase, prophase, prometaphase, metaphase, anaphase, telophase.
Chromatic chromosome is a newly formed, still attached by the centromere.
Equatorial plate: the formation is taken as linear chromosomes in the center of the spindle in the metaphase stage of mitosis and meiosis.
Spindle fibers: attract the respective chromosomes toward the centrioles.
Meiosis is a type of reduction division and multiple it is performed by two successive divisions during which four daughter cells are formed, the chromosomes are duplicated so that the number of chromosomes that appear... Continue reading "Mitosis and Meiosis" »
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Mathematics and diseases

Classified in Biology

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Microbiology
Bacteriophage: q type virus specifically affects bacteria, stá trainer x: - viral genome: formed x one or more RNA or DNA Molec d - capsid: q protein coat surrounding the viral genome. Its function is to protect the nucleic ác. Sta head formed x, q contains the genome and tail, q t is adapted to inject the viral genome in CEL. Virus: Micro without proper metabolism and require d una q cél host for their life processes. They have no cellular organization as organelles have not only trained stan x the capsid and genetic material. The rest are d microorg metabolic processes necessary for survival within the same cell d but do not need enzymes cél d the host. When Stan was d q cells are not infected InterTAN (viruses if). Organism:
... Continue reading "Mathematics and diseases" »
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Sensory Receptors and Coordination Systems in the Human Body

Classified in Biology

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Sensory Receptors and Organs

Receptors gather outside information. Exterorreceptores are sensory structures that make up the organs.

Eye

The eye is composed of 3 layers: sclera, choroid, and retina. The eyeball contains aqueous liquid and vitreous. The cornea bends light, and the lens focuses images. The retina receives inverted pictures, and fotorreceptors convert images into impulses.

Ear

The ear has 3 parts: external ear, middle ear, and inner ear. It is responsible for hearing and balance.

Touch

The skin has two layers: epidermis and dermis. It contains various receptors for pressure, cold, heat, and contact.

Nose

The nose contains mucosa and pituitary, which are responsible for olfactory receptors and heating the air.

Taste

There are 4 flavors on... Continue reading "Sensory Receptors and Coordination Systems in the Human Body" »

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