What is true about ribosomes?

1.	The prokaryotic ribosomes are 80S, where "S" stands for sedimentation coefficient
2.	These are composed of ribonucleic acid and proteins
3.	These are found only in eukaryotic cells
4.	These are self-splicing introns of some RNAs

Select the correct statement from the following regarding cell membrane:

Which one of the following structure is an organelle within an organelle ?
1. Ribosome
2. Peroxisome
3. ER
4. Mesosome

Which one of the following cellular parts is correctly described ?
1. Thylakoids - flattened membranous sacs forming the grana of chloroplasts
2. Centrioles - sites for active RNA synthesis
3. Ribosomes - those on chloroplasts are larger (80s) while those in the cytoplasm are smaller (70s)
4. Lysosomes - optimally active at a pH of about 8.5

Which one of the following organelle in the figure correctly matches with its function?

A major site for synthesis of lipids is
1. SER
2. Symplast
3. Nucleoplasm
4. RER

The Golgi complex plays a major role
1. in digesting proteins and carbohydrates
2. as energy transferring organelles
3. in post translational modification of proteins and glycosidation of lipids
4. in trapping the light and transforming it into chemical energy

Which structures perform the function of mitochondria in bacteria?

The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as :
1. Microtubules
2. Microfilaments
3. Intermediate filaments
4. Lamins

The osmotic expansion of a cell kept in water is chiefly regulated by :
1. Mitochondria
2. Vacuoles
3. Plastids
4. Ribosomes