Biology

This quantity is defined mathematically as the negative logarithm base ten of the hydronium ion concentration in a solution. At the isoelectric point of an amino acid or protein, this quantity reflects the condition where the molecule carries zero net charge. A solution with an excess of hydronium ions will show a low value for this quantity, turning litmus paper red. Human blood is carefully regulated to maintain a value of approximately 7.4 for this quantity, and deviation beyond a narrow range causes acidosis or alkalosis. , name this dimensionless scale used to measure the acidity or basicity of a solution.

Hint: Think 'potential of Hydrogen' — low means acidic, high means basic, and 7 is neutral.

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One of these things in canonical form is transformed by Foata's transition lemma. Representing these things can be described using Cauchy's [[COH-shees]] two-line notation or the more compact one-line word notation. Random ones of these things can be generated when a sequence is shuffled by the Fisher-Yates shuffle. For a set of n distinct elements, there are exactly "n factorial" ones of these things. s, name these rearrangements of a set, in which the ordering of each element is potentially changed.

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These events, first detected by Vela satellites searching for nuclear tests, are divided into "long" and "short" categories lasting more or less than two seconds. The merger of neutron stars can trigger these events, which are the most energetic electromagnetic phenomena known. For the points, name these brief but intense flashes of high-energy radiation from deep space.

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This type of tissue in plants transports water and dissolved minerals from the roots to the leaves. It consists of hollow, tube-like cells that are dead at maturity, providing structural support as well as transport function. This tissue includes vessel elements in flowering plants and tracheids in conifers. The movement of water through this tissue is driven by transpiration and cohesion-tension forces. , name this plant vascular tissue.

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This process occurs when mRNA codons are read by ribosomes to synthesize proteins. Transfer RNA molecules bring amino acids to the ribosome where they are joined by peptide bonds. The process begins at a start codon and continues until a stop codon is reached. Elongation factors assist in moving the ribosome along the mRNA strand. This process occurs in the cytoplasm in prokaryotes and on ribosomes in eukaryotes. It represents the second major step in gene expression after transcription. , name this process of protein synthesis.

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