Molecular biology

Molecular biology

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Molecular biology

red drop

Biology; Biochemistry

The sharp decline in photosynthetic efficiency as the wavelength of exciting light enters the red region (above 680 nm) due to the insensitivity of photosystem II to excitation by red light.

pH

Biology; Biochemistry

A measure of acidity of aqueous solutions; the negative of the common logarithm of the hydrogen ion concentration, -log(H + ). Values below 7 are acidic; values above 7 are alkaline.

frame-shift

Biology; Biochemistry

A mutation that throws out of register the normal reading of triplet codons during translation; usually caused by an insertion (or deletion) of one or two nucleotides into (or from) the gene.

neurophysin

Biology; Biochemistry

A protein associated with oxytocin or vasopressin in the secretory cells of the neurohypophysis and in blood; derived from the same protein precursor, proneurophysin, as the hormone it binds.

AT-AC intron

Biology; Biochemistry

One of a minority of introns which have at their 5'- and 3'-termini, respectively, the AT and AC sequences. They are excised by a mechanism similar to that for the more common GU-AG introns.

peptide

Biology; Biochemistry

A compound formed by incomplete hydrolysis of a protein, or by elimination of the elements of water from between the α-carboxy and the α-amino groups of α-amino acids to form a linear polymer.

normalized cDNA library

Biology; Biochemistry

A library that includes all cDNA clones at approximately equal frequencies, unlike most cDNA libraries, which represent cDNAs in rough proportion to the occurrence of their mRNA in the source.