The cell cycle is the sequence of events that takes place between one cell division and the next. It has three phases: interphase, nuclear division and cell division.
The Mitotic Cell Cycle
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10
Phloem contains tubes called sieve tubes that are made from cells called sieve tube elements.
Transport in Plants
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15
Oxygen diffuses down its concentration gradient from the air in the alveoli to the blood, and carbon dioxide diffuses down its concentration gradient in the opposite direction.
Gas Exchange
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15
The Okazaki fragments are formed the parent strand that runs in the 5âē to 3âē direction.
Nucleic Acids and Protein Synthesis
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10
Codominant alleles each affect phenotype when both of them are present.
Inheritance
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15
The pigments in a thylakoid membrane are arranged in clusters called photosystems.
Photosynthesis
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10
Genetic drift is the gradual change in allele frequencies in a small population, where some alleles are lost or favoured.
Selection and Evolution
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10
Antibiotic resistance arises by mutation and becomes widespread when antibiotics are overused.
Infectious Diseases
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10
Glycosidic bond: a CâOâC link between two sugar molecules, formed by a condensation reaction; it is a covalent bond.
Biological Molecules
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10
Atrial systole is the stage of the cardiac cycle when the muscle in the walls of the atria contracts.
Transport in Mammals
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15
Glycolysis is the splitting, or lysis, of glucose. It takes place in the cytoplasm of a cell.
Energy and Respiration
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15
Increasing the substrate concentration may stop the the works of competitive inhibitor.
Enzymes
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15
Any molecule which the body recognises as foreign is an antigen.