Define
cell?
Cell is the smallest structure
and function unit of living organism.
Who
was first scientist who observed piece of cork?
in 1665, Robert Hooke observed
a piece of cork under microscope
Who
was the founder of cell theory?
The founder of cell theory is
Theodor Schwann
Who
was the first scientist known that nucleus is central?
Robert brown
Identify
types of nucleus?
Prokaryote
What
is cell membrane (plasma membrane)?
Cells have a limiting boundary
called membrane it is made up of phospholipid bilayer embedded protein.
State
the functions plasma membrane?
It provides cell shape (in
animal cells)
It allows transport of
certain substances into and out of the cell
What
is cell wall?
A cell wall is structural
layer surrounding plant cell just outside the cell membrane
State
the functions of Cell wall?
It protects and supports the
plant cell
It gives the plant cell its
final shape
It is fully permeable membrane
Define
cytoplasm?
Cytoplasm is fluid medium that
is found b/w the cell membrane and the nucleus.
Differentiate
b/w mitosis and meiosis?
mitosis results in new cells
genetic material that is identical to that of the original cell. Mitosis occur
in organism undergoing growth, development, repair.
meiosis (reproductive cell )
occurs during the formation gametes which haploid (n) ( cell with half number
of chromosomes) meiosis reduce chromosomes number by half in new cells.
What
is diffusion?
Diffusion is the movement of
substances from their region of high concentration to their region of lower
concentration.
What is osmosis?
Osmosis is movement of water
molecules from the region of high water concentration to the region of low
water concentration through a semi permeable membrane.
Define
active transport?
is the movement of s certain
molecules is opposite that of diffusion, from region of their lower
concentration towards the region of their high concentration.
Differentiate
between endocytosis and exocytosis?
Endocytosis s the process of
supporting substances in to the cell by a process known as pinocytosis.
exocytosis
is the reverse of endocytosis by which a cell enjects waste products or
hormones.
Post a Comment