Chromosome mutation II
Change in Number One of the major type o chromosome mutation is change in chromosome number. There are two types of numerical changes (1) Euploidy and (2)Aneuploidy 1. Euploidy: …
Comparison between rhizome and corm
Rhizome Corm 1. It is a prostrate, thickened underground stem 2. It is usually branched and rarely unbranched. 3. It is elongated in shape. 4. It contains a less …
Difference between spine and thorn
Comparison between thorn and spine Spine Thorn Spines are modifications of leaves or parts of leaves. Their function is protection and also prevent excessive water loss. Does not deeply …
Difference between leaf and leafy shoot
Compound Leaf Leafy Branch 1. Compound leaf never bears are terminal bud 2. Compound leaf, like a simple leaf, always bears and axillary Bud in the axil of leaf, …
Attenuation
Like regulation by the trp repressor, attenuation is a mechanism for reducing expression of the trp operon when levels of tryptophan are high. However, rather than blocking initiation of transcription, attenuation prevents completion of transcription. When levels …
Tryptophan Operon
Operon: When a single promoter controls a number of genes. If tryptophan is present in the environment, then E. coli bacteria don’t need to synthesize it, so transcription of the …
Translation (Protein synthesis)
The process of protein synthesis. Charging of tRNA: Each amino acid is attached to a tRNA molecule, specific to that amino acid by a high-energy bond derived from …
Genetic Code
If genes are segments of DNA and if a strand DNA is just a string of nucleotides, then the sequence of nucleotides must somehow dictate the sequence of amino …
RNA splicing, the removal of introns
The vast majority of eukaryotic genes contain introns, segments of unknown function that do not code for polypeptides. Introns are present not only in protein-coding genes but also in …