We use cookies to improve your experience and understand how Examtube is used. You can accept analytics cookies or continue with essential cookies only.
Privacy policy3 public questions tagged with this topic.
George Palade first observed ribosomes as dense particles under the electron microscope in 1953. Ribosomes consist of RNA and proteins and are not surrounded by a membrane.
Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Mitochondria Plastids Ribosomes and Other Organelles
Robert Brown described the nucleus as a cell organelle in 1831. Flemming later used the term chromatin for the nuclear material that stained with basic dyes.
Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Eukaryotic Cell - Cell Wall and Cell Membrane - Fluid Mosaic Model
Aristotle used simple morphological characters for classification. He divided animals into those that had red blood and those that did not.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Five Kingdom Classification and Kingdom Plantae Animalia
Add our app to your home screen for a better experience.
