| 释义 |
prokaryote Biol.|prəʊˈkærɪət|
Also -caryote.
[a. F. procaryote (É. Chatton 1925, in Ann. des Sci. Nat.: Zool. VIII. 76), f. as prec. + Gr. -ώτ-ης.]
A prokaryotic organism. Opp. eukaryote.
1963Cold Spring Harbor Symp. Quantitative Biol. XXVIII. 1/1 The distinction of eukaryotes which possess a characteristic chromosome nucleus and prokaryotes where the nuclear equivalent does not show any chromosome-like structures, is not bounded by a nuclear envelope, and does not divide by mitosis. 1967Kirk & Tilney-Bassett Plastids xi. 364 This theory..makes it unnecessary to explain the separate evolution of photosynthetic ability in the prokaryotes (organisms such as bacteria and blue-green algae, with no separate membrane-bounded nucleus, or other organelles) and the eukaryotes (higher organisms, including algae and higher plants, with chromosomes inside a membrane-bounded nucleus, and other membrane-bounded organelles). 1969Loewy & Siekevitz Cell Struct. & Function (ed. 2) i. 4 The genetic information in procaryotes, at least in the organisms studied so far, is located on a single chromosome that consists of a circular double strand of DNA and that lacks the basic proteins called histones. 1976W. C. Schefler Biol. xiii. 242/1 Procaryotes therefore have a very simple structure, which leads biologists to believe that a division of living organisms into these two basic cellular types occurred long before the evolutionary development of plants and animals as distinct groups. 1976Sci. Amer. Sept. 167/2 No plant or animal is able to fix nitrogen, only prokaryotes: organisms, including bacteria and blue-green algae, that have no cell nuclei. |