Which group of chordates possess sucking and circular mouth without jaws?
Cyclostomata is the group of chordates that have sucking and circular mouth without jaws. Cyclostomes belongs to agnatha craniates which lack jaws, paired appendages, pancreas and spleen. For example: Lampreys and hags.
Which of the following is not correct?
(a) Robert Brown discovered the cell.
(b) Schleiden and Schwann formulated the cell theory.
(c) Virchow explained that cells are formed from pre-existing cells.
(d) A unicellular organism carries out its life activities within a single cell.
What are nuclear pores? State their function.