Long Answer Type
Short Answer TypeDescribe the structure of the following with the help of labelled diagrams
Nucleus - Nucleus is the control unit of the cell. It controls the cellular activities of the cell.
Structure - It is spherical in shape. It is composed of the following structures:
Nuclear membrane: It is a double membrane separating the contents of the nucleus from the cytoplasm. The narrow space between the two membranes is called the perinuclear space. Nuclear membrane has tiny holes called nuclear pores. These holes allow specific substances to be transferred into a cell and out from it.
Nucleoplasm/Nuclear matrix: It is a homogenous granular fluid present inside the nucleus. It contains the nucleolus and chromatin. Nucleolus is a spherical structure that is not bound by any membrane. It is rich in protein and RNA molecules and is the site for the formation of ribosomes. Chromatin is an entangled mass of thread-like structures. It contains DNA and some basic proteins called histones.
Multiple Choice QuestionsMitochondria and choloroplast are :
I. semi-autonomous organelles.
II. formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery.
II is true but I is false
I is true but II is false
Both I and II are false
Both I and II are false
Which one of the following cell organelles is enclosed by a single membrane?
Chloroplasts
Lysosomes
Nuclei
Nuclei
One of the major components of cell wall of most fungi is
peptidoglycan
cellulose
hemicellulose
hemicellulose
A complex of ribosomes attached to a single strand of RNA is known as
Polymer
Polypeptide
Okazaki's fragment
Okazaki's fragment
Water-soluble pigments found in plant cell vacuoles are
chlorophylls
carotenoids
anthocyanins
anthocyanins
In a chloroplast the highest number of protons are found in
lumen of thylakoids
inter membrane space
antennae complex
antennae complex
A phosphoglyceride is always made up of
only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
only an unsaturated fatty acid esterified to glycerol molecule to which a phosphate group is also attached
a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
Switch
