Question

What are the definite features of gene

Answer 1

Answer:

In the absence of demonstrated function a gene may be characterized by sequence, transcription or homology." DNA: Genes are composed of DNA, a molecule in the memorable shape of a double helix, a spiral ladder. Each rung of the spiral ladder consists of two paired chemicals called bases. There are four types of bases.

Answer 2

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The features of gene:-

i.) The promotor is located towards 5’ end of structural gene i.e. upstream. It is a DNA sequence that provides binding site for enzyme RNA polymerase. RNA polymerase binds to specific Promotor. In prokaryotes, the enzyme recognizes the promotor by its sigma factor sub unit.

ii). Structureal genes - two strands of DNA have opposite polarity. DNA dependent

RNApolymerase catalyses polymerisation in 5’→3’ direction. So the DNA strand having 3’→5’ polarity acts as template strand. The other strand of DNA having 5’→3’ polarity is complementary to template strand. The sequence of bases in this strand, is same as in RNA (where Thymine is replaced by Uracil). It is the actual coding strand. The information on this strand of DNA is copied on mRNA. This is called sense strand.

iii. )The terminator is located at 3’ end of coding strand i.e. downstream. It defines the end of the transcription process