<span>The site active of the enzyme bins the substrate to form the complex enzyme-substrate to start a specific chemical reaction. The site active of the enzyme has to fit exactly the shape of the substrate to trigger the catalysis.</span>
Sickle-cell disease is common in tropical and sub-tropical regions because being a carrier, carrying a single sickle-cell mutation (sickle cell trait), affords some resistance to malaria.
Dermis and Epidermis. The Epidermis contains keratinized cells. The Dermis <span>contains papillae.</span>
The cash crops are the crops, which has more commercial values as compared to the normal crops. The cash crops are essentially grown for the purpose selling.
The Europeans forced the native Americans and Africans to grow commercial crops, which include cocoa, peanuts, coffee, sugar,cotton, palm oil, rubber, tea, timber and tobacco. Out of which, tea, cotton and tobacco were the most forced cash crops.
Hence, the correct answer is tea, cotton and tobacco.
