Science

Difference Between Photosystem I and Photosystem II

The difference between Photosystem I and Photosystem II is primarily due to the following factors: Active reaction centre: P700 is the active reaction centre of PS-I, while P680 is the active reaction centre of PS-II. Photon absorption: PS-I absorbs light of longer wavelengths (ranging between 725-1035 nm), while PS-II absorbs light of shorter wavelengths (<680 …

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Nitrification

Nitrification is one of the crucial steps in the nitrogen cycle that occurs in soil. It is an aerobic process that involves two successive oxidation reactions, in which the ammonia first oxidizes into nitrites, and then nitrites get oxidized into nitrates. It occurs in the soil and includes members of autotrophic bacteria and archaea. The …

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Difference Between Unicellular and Multicellular Organisms

The difference between unicellular and multicellular organisms is primarily due to cell composition, cell function and cell arrangement. Unicellular organisms exist as an individual cell, whereas multicellular organisms possess a group of specialized cells. Unicellular organisms mediate all their cellular activities by a single cell itself, while multicellular organisms perform specific cell activities through their …

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Difference Between Water-Soluble and Fat-Soluble Vitamins

Difference between water-soluble and fat-soluble vitamins is primarily due to the difference in the process of absorption and excretion rates inside a body. Water-soluble and fat-soluble vitamins are the two major classes or groups of vitamins, required to maintain good health. Absorption: Water-soluble vitamins are readily absorbed in the small intestine, while fat-soluble vitamins are …

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Neurotransmitters

Neurotransmitters refer to the chemical messenger molecules, which contain amino acids, amines, purines and neuropeptides. Its activity may trigger or restrict the nerve impulse production. Its synthesis occurs endogenously by the presynaptic-neuron. Neurotransmitters release out upon membrane stimulation. They ensure neurotransmission by transmitting an action potential beyond the chemical synapse. Our nervous system uses neurotransmitters …

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Synapse

Synapse is a term pioneered by Charles S. Sherrington in 1897. It is derived from the Greek word “Synapsis” which means to conjugate or clasp. The communication between the neurons is through synapses only, which facilitate nerve signal transmission from one to the next cell. A scientist named Sanford Palay observed the ultrastructure of neural …

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Nerve Impulse

Nerve impulse refers to the generation of action membrane potential beyond the cell membrane in response to the stimulus. “Nerve impulse conduction” refers to the propagation of nerve impulse that occurs as a result of a change in membrane potential beyond the cell membrane. When a nerve impulse or action potential reaches the axon terminal, …

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Neurons

Neurons are the fundamental components of the nervous system that perform a specific task by receiving, conducting, and transmitting the signal or action potential to the other parts of the body. An electrical signal produced by the neurons is called Nerve impulse that propagates via continuous and saltatory conduction. A term neuron is sometimes interchangeable …

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