linker DNA together constitute chromatosome. Nucleosome
chain gives a beads on string appearance under electron
microscope. The beaded string is coiled to form solenoid
having 6 nucleosomes per turn. Actually the nucleosomal
organisation has approximately 10nm thickness, which
gets further condensed and coiled to produce a solenoid of
30nm diameter. This solenoid structure undergoes further
coiling to produce a chromatin fibre of 30–80 nm and then
a chromatid of 700 nm.- (a) Interspecific interactions arise from the interaction
of populations of two different species. They could be
beneficial, detrimental or neutral. Two examples of such
interactions are:
(i) Mutualism: This interaction confers benefits on
both the interacting species. Lichens represent an
intimate mutualistic relationship between fungi and
photosynthesising algae or cyanobacteria. Similarly,
the mycorrhizae represent mutualistic associations
between fungi and the roots of higher plants.
(ii) Commensalism : This is the interaction in which one
species benefits and the other is neither harmed nor
benefited. An orchid growing as an epiphyte on a
mango branch, and barnacles growing on the back of
a whale benefit while neither the mango tree nor the
whale derives any apparent benefit.
(b) Desert lizards lack the physiological ability to deal with the
high temperatures of their habitat, but manage to keep their
body temperature fairly constant by behavioural means.
They bask in the sun and absorb heat when their body
temperature drops below the comfort zone, but move into
shade when the ambient temperature starts increasing.
OR
Refer to answer 28, page no. 161, `MTG Excel in Biology’.- Refer to answer 3(ii), page no. 310, `MTG Excel in Biology’.
OR
(a) Placenta acts as an intimate connection between the
foetus and the uterine wall of the pregnant mother for
the exchange of materials. The placenta is connected
to the embryo through an umbilical cord which helps in
the transport of substances to and from the embryo. It
facilitates the supply of oxygen and nutrients to the embryo
and also removal of carbon dioxide and excretory/waste
materials produced by the embryo. Placenta also acts as
an endocrine tissue as it produces several hormones like
human chorionic gonadotropin (hCG), human chorionic
somatomammotropin (hCS), relaxin, chorionic thyrotropin,
chorionic corticotropin, estrogens, progestogens, etc.
(b) IUDs (Intrauterine contraceptive devices) are considered
as ideal contraceptives for women. It is because these are
long-acting, safer, easier to insert, incredibly effective and
reversible. IUDs do not interfere with sex or daily activities,
and can be easily removed if one wants to get pregnant.
COMEDK UGET - 2016
Consortium of Medical, Engineering and Dental Colleges of Karnataka (COMEDK)
Corporate Office : No. 132, 2nd Floor, 11th Main, 17th Cross, Malleshwaram, Bangalore - 560 055
Toll Free No: 18001036182, Fax No: 080-23568309, E-mail : [email protected]Invites applications for admission to nearly 20000 seats in Under Graduate Medical, Dental & Engineering Courses in its
14 Medical, 24 Dental and nearly 150 Engineering Member Institutions. Those who intend to apply are advised to visit the
COMEDK website (www.comedk.org) for all details and updates.
Start Date for Issue of Online Application Form : 08/02/
Last Date for receipt of Completed Application Forms : 04/04/
COMEDK UGET-2016 Test Day : 08/05/2016 | Online exam across 150 cities all over countryONLY ONLINE APPLICATION FORMS FROM 08/02/
Applications are to be filled online on our website http://www.comedk.org
Note: Neither the Application form nor filled in Applications will be sold or received in COMEDK office or by any Member
Institutions.
Payment should be made online or download the personalised challan and pay it at any Axis Bank Branch.
Note : (i) Choice of test city on “First come First serve” basis
(ii) No offline applications are being entertained.
Dr. M.R. Jayaram
Chairman, COMEDK