| 单词 |
polysome |
| 释义 |
polysome Biol.|ˈpɒlɪsəʊm|
[f. poly- + ribosome.]
A cluster of ribosomes, held together by a strand of messenger RNA which each is translating; = polyribosome s.v. poly- 1.
1962J. R. Warner et al. in Science 28 Dec. 1399/2 We have been able to show that the site of hemoglobin synthesis in vivo is not the single ribosome but rather a cluster of ribosomal particles, which we have called a ‘polyribosome’ or simply a polysome. 1970New Scientist 15 Oct. 113/1 This reticulum is a series of intracellular membranes which carry on them the polysomes (messenger RNA and ribosomes) thought to be responsible for the biosynthesis of proteins destined for export from the cell. 1971,1972[see monosome 2]. 1973R. G. Krueger et al. Introd. Microbiol. xi. 336/2 Each ribosome in the polysome has a growing polypeptide attached to it, and the ribosomes near the 3′ terminus of the mRNA molecule will have the most nearly complete polypeptide chains attached to them.
Hence polyˈsomal a., of or pertaining to a polysome.
1962Science 28 Dec. 1402/1 Dialysis followed by spraying causes considerable degradation of the polysomal structure. 1972Nature 31 Mar. 237/2 The ratio of cytoplasmic to chloroplast polysomal RNA is increased two to three times 24h after inoculation. |
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