CSIR-UGC National Eligibility Test (NET) for Junior Research Fellowship and Lecturer-ship
PREVIOUS SOLVED QUESTIONS – 2012 June CSIR – NET EXAM
This time CSIR does not allow candidates to carry questions with them. We have collected maximum questions from our candidates (memory based).
d).Shikimic and Malonic pathway
Expln:- There are three kinds of secondary metabolites in plants namely terpenes or isoprenoid compounds, alkaloids and phenolics (flavonoids and non-flavonoids.
Isopentenyl pyrophosphate (IPP) is the fundamental unit in the biosynthesis of terpene or isoprenoid. Mevalonic acid pathway is an important pathway present in all higher eukaryotes and many bacteria for the production of IPP.
In contrast to the classical mevalonic acid pathway of IPP biosynthesis, there is a non-mevalonate pathway seen in the plastids of plant, protozoa and prokaryotes. It is is known as methyl erythritol phosphate pathway (MEP pathway). In the initial step of MEP pathway,deoxy xylulose-5-phosphate (DOXP) is formed by condensation of pyruvic acid and glyceraldehyde 3-phosphate. DOXP is reduced to methyl erythritol phosphate (MEP). MEP, through several steps, IPP is formed, which is used for the synthesis of terpenes. MEP pathway is also known as DOXP pathway.
Expln:- Phytodegradation, phytovolatilisation, chelated accumulation etc. are different phytoremediation methods (details see instant notes). In chelated accumulation, synthetic metal chelate such as ethylene diamine tetraacetic acid (EDTA)is applied to soil enhancing metal accumulation by plants.
Phytomining and phytoremediation are essentially the same thing, but with different goals. While phytoremediation has an environmental goal, phytomining has an economic goal, but the principle is the same. Phytomining offers the possibility of exploiting ores or mineralized soils that are uneconomic by conventional mining methods. Our current research focuses on developing our Phytoremediation Decision Support System to reveal where phytomining is economically feasible and optimize phytomining management practices.
a. Van der Waals interactions 2 b. hydrogen bond c.ionic bond d.hydrophobic interactions
Expln:- The double helix is stabilized by two forces: hydrogen bonds between nucleotides and base-staking interactions among the aromatic nucleobases. In chemistry, Pi stacking refers to attractive, noncovalent interactions between aromatic rings. These interactions are important in base stacking of DNA molecules, protein folding, template-directed synthesis etc.
a. Inner leaflet but flip flops to outer leaflet b. Outer leaflet but flip flops to inner leaflet c.I ntercalated between the membrane lipids d.both inner and outer leaflets
Expln:- The two layers of lipids in the bilayer are referred to as the inner and outer leaflets. In biological membranes the individual lipid species are asymmetrically distributed between the two leaflets. For example, in the plasma membrane of erythrocytes, sphingomyelin and phosphatidylcholine are preferentially located in the outer leaflet, whereas phosphatidylethanolamine and phosphatidylserine are mainly in the inner leaflet.
i) Prokaryotic cell ii) Eukaryotic cell iii)Natural selection iv)Organic molecule v)Self replicating molecule
a. iv, v, i, ii, iii b. iv, v, iii, i, ii c.iv, v, i, iii, ii d.i, v, ii, iv, iii
Expln:- Trochoderma viridae is a fungus and a biofungicide. It is used for suppression of various disease caused by fungal pathogens.
Expln:- YACs are the most sophisticated yeast vectors and represent the largest capacity vectors available. It is used to clone DNA fragment larger than 100 kb and upto 3000 kb. BAC vectors can accommodate DNA inserts upto 300 kb. Hence both BAC and YAC may be used to insert 140 kb size. However, YACs are significantly less stable than BAC. Hence the stable vector to insert DNA of 140 kb is BAC vector.
a. T cell b. NK cell c.B cell d.Macrophages
Expln:- CD19 is a protein encoded by the CD19 gene. It is found on the surface of B-cells.
B. Soyabean 2. Nostoc
C. Azolla 3. Bradyrhizobium
D. Casurina 4. Anabena
a. A-2, B-1, C-4, D-3 b. A-1, B-4, C-2, D-3 c.A-2, B-3, C-4, D-1 d.A-3, B-1, C-3, D-4
More Questions & Answers Refer Simple Instant Notes