Living Environment Translated Arabic 2014 | Page 50

29. In RNA thymine is replaced by uracil so A pairs with U and C
pairs with G.
30. There are three main kinds of RNA:
1. mRNA- messenger RNA- carries messages from the DNA
in the nucleus out to the cytoplasm
2. t-RNA- transfer RNA- moves around the cytoplasm and
collect amino acids that are needed to make a specific
protein
3. r-RNA- ribosomal RNA- found in the ribosomes;
constructs the proteins from amino acids according to
the directions brought by the m-RNA