CSIR Question Solution Hub

Question  (CSIR December 2024 )  Choose the option to fill in the blank that will make the following statement logically correct; COUNTING WITH PRECISION THE NUMBER OF OCCURRENCES OF THE LETTER "I" IN THIS SENTENCE YIELD __________ . SEVEN EIGHT NINE TEN ANSWER : 3. NINE Explanation: COUNT I NG W I TH PREC I S I ON THE NUMBER OF OCCURRENCES OF THE LETTER " I " I N TH I S SENTENCE Y I ELD N I NE. Question (CSIR JUNE 2024) Choose the option that will make the following statement FALSE : A CHILD COUNTED THE NUMBER OF APPEARANCES OF THE LETTER "T" IN THIS SENTENCE,AND REPORTED IT CORRECTLY AS__________. TEN ELEVEN TWELVE THIRTEEN ANSWER :  1. TEN Explanation:   A CHILD COUN T ED T HE NUMBER OF APPEARANCES OF T HE LE TT ER " T " IN T HIS SEN T ENCE,AND REPOR T ED I T CORREC T LY AS _______________.                                                   ...

Question( June 2024):    In rate-zonal centrifugation, a mixture is spun just long enough to separate molecules that differ in mass but may be similar in shape and density. which one of the following options represents the component that is typically used to create a gradient in this technique? Phospholipids Sucrose K Cl Starch Answer: 2. Sucrose  Mass of Phospholipid-740-757 Da PC (Phosphatidylcholine)= 757 Da PE ( Phosphatidylethanolamine)=715 Da PS (Phosphatidylserine)= 758 Da PI ( Phosphatidylinositol)=833 Da Mass of Sucrose= 342.3 g/mol Mass of  K cl=74.55 g/mol Mass of starch=3.75 * 10 8 g/mol Rate zonal centrifugation method , materials used for preparation of density gradients are sucrose, glycerol, ficoll . Explanation of facts:   Centrifugation is a method employed to separate or concentrate substances suspended in a liquid by utilizing centrifugal force. This separation relies on the varying sedimentation rates of particles when exposed to a centrifug...

  What is Vicariance ? Vicariance: Vicariance is a process in biogeography where a population of organisms becomes geographically separated by a physical barrier, such as mountains, rivers, or changes in climate. This division halts gene flow between the separated groups, eventually leading to the formation of new species. For instance, when a river emerges and divides a population of animals, each group may undergo independent evolution due to genetic drift, natural selection, and varying environmental conditions. This concept is fundamental in evolutionary biology and illustrates how species diversify across different geographic areas. Question: ( CSIR DECEMBER 2024) Tectonic uplift can alter the drainage patterns of rivers ,thereby isolating populations of many species. Population isolation of this kind results from which one of the following processes? Dispersal Vicariance Range expansion  Competitive exclusion Answer:   2.Vicariance

Proteins that are essential for starting replication at the origin of E. coli. Dna A Protein Recognizes Ori C sequence, Open duplex at specific sites in Origin Dna B Protein (Helicase) Unwinds DNA Dna C Protein Required for Dna B Binding at origin Primase (Dna G)   Synthesizes RNA Primers Single-stranded DNA binding protein (SSB)   Binds single-stranded DNA DNA Gyrase (Topoisomerase-II)   Relieves torsional strain generated by DNA unwinding . Activities and function of DNA Polymerases Prokaryotic (E. coli) Number of subunits Function Pol I 1 RNA primer removal, DNA repair, Pol II (Din A) 1 DNA repair Pol III Core 3 Chromosome replication Pol III Holoenzyme 9 Chromosome replica...

  DNA Replicating enzyme/protein from E. coli and Human.