Physical Properties: Nonpolar. Tryptophan, an essential amino acid, is the largest of the amino acids. It is also a derivative of alanine, having an indole substituent on the Î² carbon. The indole functional group absorbs strongly in the near ultraviolet part of the spectrum.ryptophan, an essential amino acid, is the largest of the amino acids. It is also a derivative of alanine, having an indole substituent on the Î² carbon.
Africa is second largest and second most populous continent in the world with a total population of 1.111 billion. African languages belong to one of the four language families: Afroasiatic, Nilo-Saharan, Niger-Congo and Khoisan.Around 2,000 languages are spoken in Africa.frica is second largest and second most populous continent in the world with a total population of 1.111 billion. African languages belong to one of the four language families: Afroasiatic, Nilo-Saharan, Niger-Congo and Khoisan.
In Africa, majority of native English speakers are from South Africa, and the language is most spoken in Botswana, Cameroon, Ghana, Kenya, Lesotho, Liberia, Mauritius, Namibia, Nigeria, Rwanda, Seychelles, Sierra Leone, Sudan, Swaziland, Tanzania, Zambia, Uganda and Zimbabwe.