The pyrimidine is Uracil instead of thymine. There are three types which are involved in the synthesis of protein molecules. They are :
- messenger RNA (mRNA),
- transfer RNA (tRNA),
- ribosonal RNA (rRNA)
Buoyancy The density of fresh water is considerably less than that of the sea and such floatation is a greater problem for fresh water plankton. There is occasional flooding which submerges the plants. The water lilies, water lettuce, water hyacinth are able to stay afloat because of the air spaces in the lower part of the leaves as well as in the skins and roots.
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