NEET BIOLOGY

Detailed explanation-1: -The nucleus (plural, nuclei) houses the cell’s genetic material, or DNA, and is also the site of synthesis for ribosomes, the cellular machines that assemble proteins.

Detailed explanation-2: -Ribosome: a micro-machine for manufacturing proteins About two-thirds of this mass is composed of ribosomal RNA and one third of about 50+ different ribosomal proteins. Ribosomes are found in prokaryotic and eukaryotic cells; in mitochondria, chloroplasts and bacteria.

Detailed explanation-3: -All cells need ribosomes to make the proteins necessary for life. These multi-component molecular machines build complex proteins by stitching building blocks together according to instructions encoded in the cell’s messenger RNAs.

Detailed explanation-4: -To build proteins, the two ribosomal subunits, small and large, assemble together to form the complete ribosome. It has binding sites for mRNA and transfer RNA (tRNA) molecules. The large subunit sits on top of the small subunit, with the mRNA template sandwiched in between the two.

Detailed explanation-5: -All living cells contain ribosomes, tiny organelles composed of approximately 60 percent ribosomal RNA (rRNA) and 40 percent protein. However, though they are generally described as organelles, it is important to note that ribosomes are not bound by a membrane and are much smaller than other organelles.