Recent questions tagged 2010

Genetic engineering has been successfully used for producing –

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Some hyperthermophilic organisms that grow in highly acidic (pH2) habitats belong to the two groups –

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Alage have cell wall made up of –

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$C_4$ plants are more efficient in photosynthesis than $C_3$ plants due to –

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Photoperiodism was first characterised in –

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The first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?

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Which one of the following statements about all the four of Spongilla, Leech, Dolphin and Penguin is correct –

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The plasma membrane consists mainly of –

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If for some reason our goblet cells are non- functional, this will adversely affect –

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Toxic agents present in food which interfere with thyroxine synthesis lead to the development of –

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Which two of the following changes (a – d) usualy tend to occur in the plain dvellers when they move to high altitudes (3,500 m or more) ? (a) Increase in red blood cell size (b) Increase in red blood cell production (c) Increased breathing rate (d) Incrase in thrombocyte count Changes occurring are –

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What is true about RBCs in humans ?

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The signals for parturition orginate from –

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Darwin's finches are a good example of –

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DNA or RNA segment tagged with a radioactive moleculer is called –

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One of the free-living anaerobic nitrogen-fixer is

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During mitosis ER and nucleolus begin to disappear at –

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The permissible use of the technique aminocentesis is for –

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Which one of the following palindromic base sequences in DNA can be easily cut at about the middle by some particular restriction enzyme?

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Which one of the following is an example of ex- situ conservation ?

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The one aspect which is not a salient feature of genetic code, is its being –

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which one of the following is used as vector for cloning genes into higher organisms?

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Ovary is half-inferior in the flowers of –

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If due to some injury the chordae tendinae of the tricuspid value of the human heart is partially non-functional, what will be the immediate effect –

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The biomass available for consumption by the herbivores and the decomposers is called –

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The nerve centres which control the body temperature and the urge for eating are contained in –

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ABO blood groups in humans are controlled by the gene I. It has three alleles – $I^A, I^B$ and $i$. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur –

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Seminal plasma in human males is rich in –

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Study the four statements (a–d) given below and select the two correct ones out of them – A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers (b) Predator star fish Pisaster helps in maintainin species diversity of some invertebrates (c) Predators ultimately lead to the extinction of prey species Production of chemicals such as nicotine, strychnine by the plants are metaboilic disorders The two correct stament are-

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PGA as the first CO2 fixation product was discovered in photosynthesis of –

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The genotype of a plant showing the dominant phenotype can be determined by –

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Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called :

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Which one of the following has its own DNA?

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Listed below are four respiratory capacities (a-d) and four jumbled respiratory volumes of a normal human adult:

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Select the correct statement from the ones given below :

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One example of animals having a single opening to the outside that serves both as mouth as well as anus is

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Apomictic embryos in citrus arise from :

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Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?

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Sertoli cells are found in :

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Which one is most reactive towards $S_N1$ reaction?

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Which of the following structures represents Neoprene polymer?

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Which of the following reactions will not result in the formation of carbon-carbon bonds?

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In the following the most stable conformation of n-butane is:

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Which one of the following is employed as a Tranquilizer drug?

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Which one is most reactive towards electrophilic reagent?

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Property of the alkaline earth metals that increases with their atomic number:

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The existence of two different coloured complexes with the composition of $[Co(NH_3)_4Cl_2]^+$ is due to

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In a buffer solution containing equal concentration of $B^-$ and HB, the $K_b$ for $B^-$ is $10^{-10}$. The pH of buffer solution is:

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25.3 g of sodium carbonate, $Na_2CO_3$ is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, $Na^+$ and carbonate ions,$CO_3^{2-}$ are respectively (Molar mass of $Na_2CO^3$ = 106 g mol–1)

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Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is :

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