Ribosomes are composed of rrna and what other component?
protein
carbohydrates
dna
mrna

Protein

Explanation:

Ribosomes are made up of two sub-unites:

The larger of the 2 sub-unite where the amino acids get added to form polypeptide chain.The small sub-unite (which reads the RNA) is where the mRNA bind and is decoded. So, each of the molecules composed of one or more ribosomal RNA and ribosomal proteins.

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.