Molecular biology

Molecular biology

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Molecular biology

Krebs urea cycle

Biology; Biochemistry

The metabolic pathway that receives nitrogen and carbon dioxide, as carbamoyl phosphate and aspartic acid, and synthesizes urea.

substrate-level phosphorylation

Biology; Biochemistry

The metabolic synthesis of ATP that does not require the electron transport chain, e.g. the glyceraldehyde-3-phosphate dehydrogenase reaction.

transmethylation

Biology; Biochemistry

The metabolic transfer of preformed methyl groups from one acceptor to another, e.g. from S-adenosylmethionine to guanidinoacetate to form creatine.

Entner-Doudoroff fermentation

Biology; Biochemistry

The metabolism of glucose, e.g. by Pseudomonas fluorescens, via 6-phosphogluconic acid and 2-oxo-3-deoxy-6-phosphogluconic acid to pyruvate and glyceraldehyde 3-phosphate.

corepressor

Biology; Biochemistry

The metabolite that when bound to the repressor (of a repressible operon) forms a functional unit that can bind to its operator and block transcription.

prion rods

Biology; Biochemistry

The microscopic rods that appear when prions, that have been broken up with proteinase K but then allowed to come back together into crystalline forms.

consensus sequence

Biology; Biochemistry

The minimal common sequence that appears in homologous polynucleotides or proteins, or limited regions of these, e.g. the sequence around the active-site region of serine proteinases.