Neurons Three types of – Sensory neuron: carries messages from sensory organs to the spinal cord and brain – Motor neuron: carries messages from the brain and spinal cord to muscles and glands – Internevron: connections in the nervous system from other nerve cells – Transfers signals using electrical impulses and chemical substances – Available … Read more

Biology – Genetics

Posted in Biology | Biology 2 on the 07.02.2012

Gen is a limited area of a kromsom containing the recipe for a functional product, often protein but also mRNA, tRNA. The gene has a specific position on the chromosome called the gene locus. In two homologous chromosomes (chromosomes from each parent containing the same genparene) has a pair of genes (gene variants, alleles from … Read more

Biology – Photosynthesis

Posted in Biology | Biology 2 on the 07.02.2012

Takes place in the chloroplast in plants. The plants convert light energy into chemical energy. In the light reactions are light energy as chemical energy bound in the form of NADPH and ATP. In the dark reaction, CO2 is fixed into glucose by means of NADPH and ATP. Reaction Equation: 6CO2 + 12 H2O – … Read more

Structure of the DNA molecule A nucleotide consists of deoxyribose, a fosfation and a nitrogen base (either adenine, thymine, cytosine, or guanine). These nucleotides are bound together by covalent bonds (between deoxyribose) to form the DNA strand. Two strands of DNA come together to form a double helix called the double helix (DNA molecule). Nitrogen … Read more

Biology – General Ecology

Posted in Biology on the 07.02.2012

Ecological succession Changes in species composition due to abiotic and biotic factors. When conditions change (sudden, large changes or slow changes) there is a succession. Forest fires, landslides andĀ volcanic eruptions changing conditions so that it is not in accordance with niches (the requirement for abiotic and biotic factors a species has. Copy. Habitat, temperature, nesting … Read more

Carbon cycle The carbon cycle is never-ending circle where photosynthesis converts inorganic carbon into organic, and cellular respiration converts organic carbon into inorganic, etc. Inorganic carbon (mostly CO2) is energy poor and stable in the environment, while organic carbon (all living organisms and fossil fuels) are energy-rich and unstable. Mon supply energy to the inorganic … Read more

Darwin Charles Darwin was a British naturalist who was born in 1809. He played a major role in the development of evolutionary theory. Although many researchers had been working on theories that were similar to the theory of evolution before Darwin, it is Darwin who is credited for the theory which also later was named … Read more

Growth: – Does the breakdown of the reference food that surround the embryo in the seed – Can also be due to increase in dry weight (the amount of plant material that is left when the plant has dried out) – An external force will cause a response (response at the cellular level) in the … Read more

Transportation: Water: – Consists of one oxygen atom and two hydrogen atoms – Oxygen is an electronegative atom, that is, it draws more electrons than other atoms – Do what we call a polar covalent bond, ie a slight positive charge around the hydrogen atoms and a slight negative charge around the oxygen atom Transport … Read more

Nitrification: Some aerobic bacteria convert NH4 + to nitrite ions, NO2, while other aerobic bacteria convert NO2-on to the nitrate ions, N03-. Denitrification: Under anaerobic conditions some bacteria obtain the oxygen to their cellular respiration by cleaving nitrate ions to oxygen gas, O2, and nitrogen gas, N2. The organic material that manufacturers stock per year … Read more