NEET Practice Questions (MCQs) with Answers & Solutions

The text says: '...we have learnt the lesson of transferring genes into plants and animals from bacteria and viruses which have known this for ages – how to deliver genes to transform eukaryotic cells and force them to do what the bacteria or viruses want.'

The context states, 'The majority of baculoviruses used as biological control agents are in the genus Nucleopolyhedrovirus. These viruses are excellent candidates for species-specific, narrow spectrum insecticidal applications. They have been shown to have no negative impacts on plants, mammals, birds, fish or even on non-target insects.'

According to the NCERT text, 'Nucleus as a cell organelle was first described by Robert Brown as early as 1831.'

The NCERT states, 'Later the material of the nucleus stained by the basic dyes was given the name chromatin by Flemming.'

The text mentions, 'Electron microscopy has revealed that the nuclear envelope, which consists of two parallel membranes with a space between (10 to 50 nm) called the perinuclear space...'

The NCERT states, 'These nuclear pores are the passages through which movement of RNA and protein molecules takes place in both directions between the nucleus and the cytoplasm.'

The text provides examples: 'Some mature cells even lack nucleus, e.g., erythrocytes of many mammals and sieve tube cells of vascular plants.'

The NCERT states, 'The content of nucleolus is continuous with the rest of the nucleoplasm as it is not a membrane bound structure.'

The text clearly states, 'It is a site for active ribosomal RNA synthesis.'

The NCERT mentions, 'Larger and more numerous nucleoli are present in cells actively carrying out protein synthesis.'