Long seized and tubular structures found in Gram-ve bacteria and helping in conjugation are called pili/fimbriae.

Structure found in blue green algae which helps in nitrogen fixation is:

Protein found in a biological system with a unique three dimensional structure and biological activity is called a native protein. When a protein in its native form, is subjected to a physical change like change in temperature or a chemical change like, change in pH, denaturation of protein takes place. Explain the cause.

Amino acids as the name suggest, have both an amino group and a carboxyl group in their structure.In addition all naturally occuring aminoacids (those which are found in proteins) are called L-aminoacids. From this,can you guess from which compound can the simplest aminoacid be made?

Fill in the blanks Nephridia are the coiled tubular structures found in annelids which work as…………..organs.

An elaborate network of filamentous proteinaceous structures present in the cytoplasm which help I he maintenance of cell shaped is called:

Choose the wrong statements regarding bacterial cell: (A)Glycocalyx is the outermost envelope in bacteria (B)The glycocalyx may be a loose sheat called capsule ( C)The glycocalyx may be thick and tough called slime (D) A special structure formed by the plasma membrane is called mesosomes (E) Small bristle-like fibris sprouting out of the cell are called fimbrae

A piece of wood from the ruins of an ancient building was found to have a "^14C activity of 12 disintegrations per minute per gram of its carbon content. The "^14C activity of the living wood is 16 distintegrations per minute per gram. How long ago did the tree, from which the wooden sample came, die? Given half-life of "^14C is 5760 years.