easybiologyclass, csir jrf net life sciences

CSIR UGC JRF NET December 2014 Results Life Sciences

Results of CSIR-UGC-JRF-NET Examination December 2014 has been announced.

You can check the results from here (CSIR-JRF NET Life Sciences December 2014 Results)

In the category of Life Sciences a total of ~ 520 JRFs and ~ 680 NETs were awarded this time.

So far the CSIR has not mentioned the details of cut-off marks this time.

And the answer keys of December 2014 Examination have not been released yet.

Congratulations from EBC to all who qualified the examination
Regards
easybiologyclass

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biological chemistry

Biochemistry of Plasma Membrane Lipids: Properties, Structure and Classification (Biochemistry Lecture Notes)

PLASMA MEMBRANE LIPIDS
Biochemistry, Properties, Structure and Classification of Lipids of Plasma Membrane

 “Good fences make good neighbors”
Robert Frost, “Mending Wall”, 1914


Biological membrane system: Biological membranes are highly dynamic two layers thick sheath like structures formed by the non-covalent assemblage of lipids, proteins and carbohydrates. They form closed boundaries between different compartments of the cells such as separation of nucleoplasm from the cytoplasm by nuclear membrane in all eukaryotes. They act as barriers to the passage of polar molecules and ions. The thickness of membrane varies among different classes of organisms and the average width ranges from 60 Å (6 nm) to 100 Å (10 nm) in most of the cases.

Even though membrane contains carbohydrates and proteins, the major structural components of bio-membrane are a special class of lipids called membrane lipids. In storage lipids (triglycerides) the three –OH groups of glycerol moieties are esterified by three fatty acids and thus they are completely non-polar. However in membrane lipids, the hydroxyl group at C1 and C2 are esterified with fatty acids and the remaining third –OH group (at C3) will combine to a polar molecule. Thus membrane lipids are amphipathic because they have hydrophilic head (polar) at one end and hydrophobic tail (nonpolar) at the other end. The long hydrocarbon chain of fatty acids forms the hydrophobic part. The hydrophilic moieties of membrane lipids are of different types and which may be as simple as –OH or may be much complex like carbohydrates or amino acids or their derivatives. We commonly call the polar part of membrane lipid as ‘Head’ group and the nonpolar part as ‘Tail’ group.

easybiologyclass, membrane lipid: polar head and non-polar tail group

easybiologyclass, plasma membrane structure and organization, lipid bi-layer of plasma membrane.

The hydrophobic interactions of the nonpolar parts among themselves and the hydrophilic interaction with water are responsible for the packing of lipids in the membrane. These hydrophilic and hydrophobic interactions are also responsible for the bilayer organization of membranes in the cells.

Classification of membrane lipids:

Membrane lipids are classified based on the properties of ‘Head’ group. The membrane lipids of Prokaryotes, Eukaryotes and Archaebacteria are grouped into four major categories:

.

1.   Phospholipids

2.   Glycolipids

3.   Sterols

4.   Archaebacterial ether lipids

 easybiologyclass, mind map membrane lipid classification chart

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easybiologyclass, csir jrf net life sciences

CSIR UGC JRF NET June 2015, Notification: For Junior Research Fellowship (JRF) & Eligibility for Lectureship (NET)


CSIR JRF NET Life Sciences June 2015 Notification

CSIR will hold the Joint CSIR-UGC Test Tentatively on 21st June, 2015 for determining the eligibility of the Indian National candidates for the award of Junior Research Fellowships (JRF) NET and for determining eligibility for appointment of Lecturers (NET) in certain subject areas falling under the faculty of Science & Technology. The award of Junior Research Fellowship (NET) to the successful eligible candidates will depend on their finding admission/placement in a university/ national laboratory/ institution of higher learning and research, as applicable.

A candidate may apply either for ‘JRF’ or for ‘Lectureship’ (LS) only. He/she may indicate his/her preference in the Online Application, as the case may be. CSIR may consider candidates for ‘JRF’, or ‘Lectureship only” depending on number of fellowships available & performance in the test subject to the condition that they fulfill the laid down eligibility criterion. If a candidate is found to be over-age for JRF (NET) he/she will automatically be considered for Lectureship (NET) only, except for Engineering Sciences.

Engineering Sciences candidates will only be eligible for CSIR JRF ship and are advised to opt for JRF only in the application form. Candidates with M.Sc. qualification or under M.Sc.  Result Awaiting (RA) category shall be eligible for LS in the subjects except Engineering Sciences, subject to the eligibility criteria as laid down by the UGC.

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easybiologyclass, csir jrf net life sciences

CSIR JRF NET Life Sciences December 2014 Question Paper & Answer Key with Explanations (1)

CSIR/JRF/NET: Life Sciences, December 2014 (II):
Part B (Original Questions)


New: NET Life Sciences Dec 2015 Question Paper with Detailed Answer key

(1). Chirality of DNA is due to:

a. The bases
b. Base stacking
c. Hydrogen bonds between bases
d. Deoxyribose

Ans: d – Deoxyribose

Biomolecules like DNA, proteins, amino acids and sugars are chiral molecules.

(2). Proton motive force during oxidative phosphorylation is generated in mitochondria by:

a. Exchanging protons for sodium ions
b. Pumping protons out into inter-membrane space
c. Pumping hydroxyl ions into the mitochondria
d. Hydrolysis of ATP

Ans: c – Pumping protons out into inter-membrane space

During Electron Transport System (ETS) in the inner mitochondrial membrane, protons are pumped out of the mitochondrial matrix in to peri-mitochondrial space. This creates a concentration gradient of H+ ions between mitochondrial matrix and peri-mitochondrial space to have a proton-motive force. This proton-motive force will be later utilized by the ATP synthase enzyme to synthesize ATP. In chloroplasts, during light reaction of photosynthesis, the proton-motive force is created between inner thylakoid space and chloroplast matrix. Here also this proton-motive force will be later used by ATP synthase to produce ATP.

(For details: Voet and Voet, 2012, Fundamentals of Biochemistry, Ed. 4, Chapter 18, Electron Transport and Oxidative Phosphorylation, Page: 587)

Chemiosmotic theory: (proposed by Peter Mitchel, 1961): Free energy of electron transport is conserved by pumping H+ from the mitochondrial matrix to the inter-membrane space to create an electrochemical H+ gradient across the inner mitochondrial membrane. The electrochemical potential of this gradient is harnessed to synthesize ATP

(For details: Voet and Voet, 2012, Fundamentals of Biochemistry, Ed. 4, Chapter 18, Electron Transport and Oxidative Phosphorylation, Page: 604)

(3). In proteins, hydrogen bonds forms as follows: Donor (D)-H— Acceptor (A). Hydrogen bond is more favourable if the angle between D-H and A is:

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Free Net Life Science Study Materials

JRF SRF and RA Fellowship Hike about 50%, Revised Rate October 2014

Revised Rate of CSIR, ICMR and DBT Junior/Senior Research Fellowship (JRF/SRF) and Salary of Research Associates (RA)


A Delicious Diwali Gift for Blooming Scientists in India

In order to encourage science research scholars across India, The Ministry of Science and Technology, Government of India, has announced a Fellowship Hike of about 50% in the amount of various categories of young researches such as Junior Research Fellowship (JRF), Senior Research Fellowship (SRF) and Research Associate (RA). The revised fellowship amount will be as follows (previous rates in brackets)

Junior Research Fellowship (JRF)               : Rs. 25,000.00/- + 30%HRA* (Rs. 16.000/-)

Senior Research Fellowship (SRF)               : Rs. 28,000.00/- + 30%HRA* (Rs. 18,000/-)

Research Associate Category I (RA-I)         : Rs. 36,000.00/- + 30%HRA* (Rs. 22,000/-)

Research Associate Category II (RA-II)      : Rs. 38,000.00/- + 30%HRA* (Rs. (23,000/-)

Research Associate Category III (RA-III)    : Rs. 40,000.00/- + 30%HRA* (Rs 24,000/-)

The revised rate will take effect from 01/10/2014.

* Percentage of HRA varies with the norms of host institutions


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