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There are three main differences between DNA and RNA: 

1. RNA has the base uracil instead of the base thymine. These bases are ve...

Active immunity is due to the over production of antibodies by the organism itself after the body's defence mechanisms have been stimulated by the invasion of foreign micro-organisms. Whereas, passive ...

An allele that has the same effect on the phenotype whether it is present in homozygous or heterozygous state. Dominant alleles mask the effect of recessive alleles. 

1) Crossing over - in Prophase I of meiosis, non-sister chromatids in the same bivalent (i.e. chromatids on separate chromosomes within a homologous pair) can exchange alleles, creating n...

Transcription is the formation of an mRNA molecule from its complementary DNA template.
First the enzyme DNA helicase unwinds the double helix, and the hydrogen bonds between complementary bases brea...