57. The first alkaloid to be isolated and characterized from plants is: (a) Caffeine (b) Cocaine (c) Morphine, (d) Quinine Introduction Alkaloids are a diverse group of naturally occurring organic […]
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DBT BET JRF 2019 Previous Year Questions and Video solution
Balancing Intracellular pH: Mechanisms for Reducing pH in Cells
If the intracellular pH of a cell becomes basic, which one of the following will help reduce the pH? (1) Export of Cland import of HCO3 – (2) Import of […]
DBT BET JRF 2021 Previous Year Questions and Video solution
Infection Mechanism of Rice Blast Fungus and Its Specialized Structures
56. The rice blast fungus Magnaporthegrisea, invades rice plants in a manner typical ofmany foliar pathogens by producing specialized infection structures called: (a) Appressoria (b) Infection tube (c) Mycota (d) […]
DBT BET JRF 2020 Previous Year Questions and Video solutions
Green Sulfur Bacteria: Marine Phototrophs Using Carbon Dioxide as a Carbon Source
Which of the following marine phototrophs can utilise carbon-dioxide as the carbon source? 1. Green sulfur bacteria 2. Halobacteria 3. Chloroacidobacteria 4. Hellobacteria Introduction Marine environments are home to a […]
DBT BET JRF 2019 Previous Year Questions and Video solution
Degrading RNA in RNA-DNA Hybrids: The Role of RNase H and Other Enzymes
97.An experiment involves formation of RNA-DNA hybrid. Which one of the following enzymes could be utilized to degrade only the RNA strand from the RNA-DNA hybrid? (1) Micrococcal nuclease (2) […]
DBT BET JRF 2021 Previous Year Questions and Video solution
The Most Appropriate Explants for Producing Virus-Free Plants through Micropropagation
55. A plant species nearing its extinction due to viral infection has been chosen formicropropagation by tissue culture. Which explants will be the most appropriate toproduce virus-free plants? A. Shoot […]
DBT BET JRF 2020 Previous Year Questions and Video solutions
Chemotherapeutic Drug Trabectedin: A Marine-Derived Cancer Treatment
Which of the following is a chemotherapeutic drug obtained from marine source? 1. adriamycin 2. avastin 3. trabectedin 4. abraxane Introduction Chemotherapy is a vital part of cancer treatment, […]
DBT BET JRF 2021 Previous Year Questions and Video solution
The Effect of Red and Far-Red Light on Flowering in Plants
54. When the critical night length in winters is disrupted by a pulse of red light followed bya pulse of far red light: (a) Both long-day and short day plants […]
DBT BET JRF 2019 Previous Year Questions and Video solution
Incomplete Dominance in Genetics: Predicting the Phenotypic and Genotypic Ratios in Heterozygous Crosses
96.If the allele A is incompletely dominant over allele a, what is expected in a progeny of two heterozygous parents? (1) Same phenotypic and genotypic ratios (2) 2:1 phenotypic ratio […]
DBT BET JRF 2020 Previous Year Questions and Video solutions
Understanding the Correct Sequence of Pathogenesis in Infectious Diseases
Which of the following represents the correct sequence of steps in pathogenesis? 1. adhesion, exposure, infection, invasion 2. adhesion, infection, exposure, invasion 3. invasion, infection, adhesion, exposure 4. exposure, adhesion, […]
