Cell Biology Answers

EXPLAIN SEMI - CONSERVATIVE REPLICATION OF DNA . WHAT ARE THE ENZYMES INVOLVED IN THIS PROCESS ? WRITE THEIR FUNCTIONS .

LIST FOUR TYPES OF TISSUES IN VERTEBRATES ON THE BASIS OF THEIR FUNCTION . DESCRIBE ANY TWO OF THESE.

DISTINGUISH BETWEEN THE FOLLOWING ;

(1) PROTONPUMP IN AEROBIC AND UNAEROBIC BACTERIA
(2) SCLERENCHYAMA AND COLLENCHYMA
(3) DIFFUSION AND OSMOSIS

LIST THE ENTRY MOLECULES AND THE END PROPDUCTS OF THE FOLLOWING PROCESS ;

(1) GLYCOLYSIS
(2) TCA CYCLE

With the help of examples, explain the
secondary structure of proteins.

2. Two chambers A and B are separated by a
membrane which is permeable to Cl⁻ , but
not to K⁺. Chamber A is filled with 100 mM
KCI and chamber B with 10mM KCl. For
the above situation answer the following
questions :

(a) Do these chambers remain in state of
electrical neutrality before any
movement of the ions starts ? Give
reasons.

(b) Explain what happens when the
diffusion starts.

Fill in the blanks :

(i) __________do not have the well-
defined organelles.

(ii) In amylose, glucose molecules are
linked together by ___________
linkage.

(iii) The pieces of DNA synthesised
discontinuously away from the
replication fork are called ___________ .

(iv) In allosteric enzyme regulation, the
effector molecule binds non-covalently
to the ____________ site of the enzyme.

(v) Simple lipids are formed by the combination of three fatty acid molecules with a ________
molecule .

Give the appropriate terms used for each of the following :

(a) The process of twisting of non_sister
chromatids around each other during
meiosis.

(b) The cell organelle which is the site of
protein-synthesis.

(c) The protein coat surrounding the
genetic material of a virus.

(d) The movement of solute across the
membrane from higher concentration
to lower concentration mediated by a
transport molecule.

(e) The energy required to break the
energy-barrier in order to start a
reaction in a biological system.

Base on thier carbon and energy sources eubacteria are

With the help of an example explain the role of cyclic AMP in carrying out signalling mediated by a cell - surface receptor .