Prelims

Antigen is a substance which

Which organelle in the cell, other than nucleus, contains DNA ?

Epiphytes are plants which depend on other plants for

Assertion (A): Scientists can cut apart and paste together DNA molecules at will, regardless of the source of the molecules. Reason (R): DNA fragments can be manipulated using restriction endonucleases and DNA ligases.

The cellular and molecular control of programmed cell death is known as

Consider the following statements with reference to the Periodic Table of chemical elements : I. lonisation potential gradually decreases along a period. II. In a group of elements, electron affinity decreases as the atomic weight increases. III. In a given period, electronegativity decreases as the atomic number increases. Which of these statement(s) is/are correct ?

Quartizite is metamorphosed from

Which of the following cell organelles play the most significant role in protein synthesis ?

An aqueous solution of copper sulphate is acidic in nature because the salt undergoes

In an atom, the order of filling up of the orbitals is governed by