Covalent analogues of DNA base-pairs and triplets. Part 2[c]
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Additional resources for Covalent analogues of DNA base-pairs and triplets. Part 2[c] Synthesis and cytostatic activity of bis(purin-6-yl)acetylenes, -diacetylenes and related compounds
One based on general principles independent of the particular things to be explained (atomic theory; theory of evolution)’. So the Theory of Evolution is not a speculative idea, but a synthesis of ideas, ﬁrmly based on observation, explaining how species have arisen (and continue to arise). g. geographically), they will diverge as they become better adapted to their different environments; 5 eventually, the differences between the two populations will be sufﬁcient for us to call them different species.
E. one strand is from one parent and the second strand is from the other parent. e. q will be converted to Q, or vice versa), or, if replication occurs ﬁrst, the progeny will be mixed for this character. This is a simpliﬁed model which ignores factors such as the threedimensional structure of the DNA as well as alternative products that can arise. The basic message is that recombination involves cutting DNA strands, switching strands between the duplexes, and rejoining them. 2 Enzymes involved in recombination One of the key enzymes in this process is the RecA protein.
Termination is dependent on the activity of another protein known as the rho factor. These are therefore known as rho-dependent terminators. 2 Translation The genetic code The mRNA carries the information for the sequence of amino acids in a protein in the form of the genetic code (see Appendix F) in which each occurrence of one of the 64 groups of three nucleotides (triplets or codons) codes for a speciﬁc amino acid (or for a stop signal). 26 NUCLEIC ACID STRUCTURE AND FUNCTION The code is almost universal, in all organisms, although there are occasional minor differences, such as the use of UGA, which is normally a stop codon, to code for tryptophan or cysteine.