CSIR NET Life Sciences MCQs Part 2 12:48:00 AM Posted by AEI Online Tutor No Comments CSIR NET Life Sciences MCQs Part 2 CSIR NET Life Sciences MCQs 1. In each of the following groups of words is a hidden number, based on which you should arrange them in descending order. Pick the correct answer: E. Papers I Xeroxed F. Wi-Fi veteran G. Yourself ourselves H. Breaks even H, F, G, H E, G, F, H H, F, G, E H, E, F, G 2. A person walks downhill at 10 km/h, uphill at 6 km/h and on the plane at 7.5 km/h. If the person takes 3 hours to go from a place A to another place B, and 1 hour on the way back, the distance between A and B is 15 km 23.5 km 16 km Given data is insufficient to calculate the distance. 3. Enzymes accelerate a reaction by which one of the following strategies? Decreasing energy required to form the transition state Increasing kinetic energy of the substrate Increasing the free energy difference between substrate and the product Increasing the turn over number of enzymes 4. Which one of the following chemicals is a DNA intercalator? 5-Bromouracil Ethyl methane sulfonate Acridine orange UV 5. An antibiotic that resembles the 3’end of a charged tRNA molecule is: Streptomycin Sparsomycin Puromycin Tetracycline 6. Phenylalanine, a precursor of most of the phenolics in higher plants is a product of which one of the following pathways? Shikimic acid pathway Malonic acid pathway Mevalonic acid pathway Methylerythritol pathway 7. Instructive and permissive interactions are two major modes of inductive interaction during development. The following compares some properties of cell lines and cord blood stem cells. Cell lines, which are stored in liquid nitrogen, can be retrieved for experiments, where they behave as per their original self. Cord blood can also be retrieved from liquid nitrogen for procuring stem cells. Unlike cell lines, the stem cells can be additionally induced to undergo differentiation into desired lineages, which are very different from their original self. The behaviour of cell lines and stem cells is analogous to which of the interactions? Both cell lines and stem cells show instructive interaction Cell lines show instructive interaction whereas stem cells show permissive interaction Cell lines show permissive interaction whereas stem cells show instructive interaction Both types of cells show permissive instruction 8. When rods of retina kept in dark, were exposed to light, phototransduction occurred. Following are some explanations given by a researcher regarding phototransduction: A. Activation of transducin B. Inhibition of cGMP phosphodiesterase C. Closure of Na+ channels D. Hyperpolarization of rods Which one did NOT occur in phototransduction only A only B A and C C and D 9. Two siblings who inherit 50% of the genome from the mother and 50% from the father show lot of phenotypic differences. Which one of the following events during gametogenesis of the parents will maximally contribute to this difference? Mutation Recombination Independent assortment Environment 10. The following are some important features which are commonly associated with animal development: A. Position of anus development with respect to blastopore B. Method of cell division C. Mechanism of coelom formation D. Cleavage pattern during egg development Based on the above, which one of the following combinations differentiate the development of deuterostomes from that of protostomes? A, B and C B, C and D A, C and D A and B Score = Correct answers: CSIR NET Life Sciences MCQs Parts => 1.. 2..
CSIR NET Life Sciences MCQs Part 1 1:21:00 PM Posted by AEI Online Tutor No Comments CSIR NET Life Sciences MCQs Part 1 CSIR NET Life Sciences MCQs 1. Of the following, which is the odd one out? Cone Torus Sphere Ellipsoid 2. “My friend Raju has more than 1000 books”, said Ram. “Oh no, he has less than 1000 books”, said Shyam. “Well, Raju certainly has at least one book”, said Geeta. If only one of these statements is true, how many books does Raju have? 1 1000 999 1001 3. Predominant interactions between phospholipids that stabilize a biological membrane include hydrogen bonds and covalent interactions van der Waal and ionic interactions hydrophobic interactions and hydrogen bonding covalent and hydrophobic interactions 4. Entry of enveloped viruses into its host cells is mediated by: Only endocytosis Both endocytosis and phagocytosis Both endocytosis and membrane fusion Only pinocytosis 5. Lateral diffusion of proteins in membrane can be followed and diffusion rate calculated by Atomic force microscopy Scanning electron microscopy Transmission electron microscopy FRAP 6. Histone deacytalase (HDAC) catalyses the removal of acetyl group from N-terminal of histones. Which amino acid of histone is involved in this process? Lysine Arginine Asparagine Histidine 7. Two interacting genes (independently assorting) were involved in the same pathway. Absence of either genes function leads to absence of the end product of the pathway. A dihybrid cross involving the two genes is carried out. What fraction of the F2 progeny will show the presence of the end product? 1/4 3/4 9/16 15/16 8. For two species A and B in competition, the carrying capacities and competition coefficients are KA = 150 KB = 200, Alpha = 1.0 Beta = 1.3 According to the Lotka-Volterra model of interspecific competition, the outcome of competition will be Species A wins Species B wins Both species reach a stable equilibrium Both species reach an unstable equilibrium 9. One hundred independent populations of Drosophila are established with 10 individuals in each population, of which, one individual is of Aa genotype and the other nine are of AA genotype. If random genetic drift is the only mechanism acting on these populations, then, after a large number of generations, the expected number of populations fixed for the "a" allele is 75 50 25 5 10. In a typical gene cloning experiment, by mistake a researcher introduced the DNA of interest within ampicilin resistant gene instead of lac z gene. The competent cells were allowed to take up the plasmid and then plated in the media containing ampicilin, X-gal and IPTG and subjected to blue-white screening. Considering all plasmids were recombinant which one of the following statements correctly describes the outcome of the experiment? The bacteria which took up the plasmids would grow and give blue colonies The bacteria which took up the plasmids would not grow The bacteria which took up the plasmids would form white colonies All of the bacteria would grow and give white colonies Score = Correct answers: CSIR NET Life Sciences MCQs Parts => 1.. 2..
