Seven students A, B, C, D, E, F, G stand in a line. A is exactly in the middle. B is to the left of A. C is second to the right of A. D is at the right end. E is between B and A. F is not next to G. Who is at the left end?

Statements: Some politicians are actors. Some actors are directors. No director is a writer. Some writers are singers. Conclusion I: Some politicians are writers. Conclusion II: Some actors are singers. Which is valid?

Doctor is to Hospital as Teacher is to ?

A is brother of B. C is mother of A. D is father of C. E is mother of D. How is A related to E?

Which organelle is responsible for protein synthesis?

Which of the following is the function of tRNA?