See ACYCLOGUANOSINE.参阅acycloguanosine。...[继续阅读]

    A small protein involved in the synthesis of fatty acids.First isolated from E. coli bacteria by Roy Vagelos,it was found to be a 77 amino acid polypeptide chain,capable of binding six other enzymes required for fatty acid synthesis.一种与脂肪酸合成有关的小分子蛋白质,最早由R...[继续阅读]

    1 . sensory - A progressive decrease in the number of impulses that pass over a sensory neuron even when there is continuous or repetitive sensory stimulation to the sense organ involved. Sensory adaptation provides an organism with a way to deal with the...[继续阅读]

    Enzymes that are produced by microbes only when their substrates are present. When not needed,they are not produced. This is in contrast to constitutive enzymes,which are always produced.仅在底物存在时才能由微生物产生的酶。如不需要,可不合成。这与组成酶相反,后者在细...[继续阅读]

    A term used to describe transfer RNA due to its role during translation of mRNA. Several properties of the tRNA molecule enable it to act as an adaptor molecule. The highly specific nature of tRNA-amino acid binding,the complementary base pairing of the t...[继续阅读]

    One of the four major bases found in nucleic acids. Adenine and guanine are purines; cytosine,thymine,and uracil are pyrimidines. These nitrogenous bases are a component of the basic building blocks of nucleic acids called nucleotides. Within the DNA doub...[继续阅读]

    A benign tumor of glandular tissue. 腺体组织的一种良性肿瘤。...[继续阅读]

    A nucleoside containing the pentose sugar ribose and the purine base adenine. When a phosphate group is attached to the 5′ carbon in the ribose,the nucleoside becomes a nucleotide,a basic building block of nucleic acids. 一种含有核糖和腺嘌呤碱基的核苷。当核糖的5′碳原子与磷酸...[继续阅读]

    A genetic condition in which the lack of the enzyme adenosine deaminase results in the disease,severe combined immunodeficiency(SCID). This rare disease leaves individuals with no functioning immune system and results in death at a very early age. This wa...[继续阅读]

    A product of the hydrolysis or enzymatic cleavage of the terminal phosphate group of adenosine triphosphate (ATP). The other product produced during this reaction is inorganic phosphate. ATP is cleaved to provide energy for cells to do work .三磷酸腺苷(ATP)经水解...[继续阅读]