List of top Questions asked in GATE XL

Which mold is responsible for the characteristic blue marbling in blue-veined cheese?
Which genus of bacteria does NOT have a cell wall?
Which of the following pigment does NOT have pro-vitamin A activity?
What would be the number of genotypes and phenotypes, respectively, from a cross between genotypes AaBBCcDd and AaBBCcDd? Assume independent assortment and simple dominant-recessive relationship in each gene pair.
Nucleosomes are made up of DNA and histones. Histones undergo various kinds of modifications by different groups of proteins. They are known as histone writers, readers, and erasers. Which of the following is/are histone writer(s)?
Which of the following statements in relation to cell movement during gastrulation in Sea urchin is/are correct?
The animals belonging to which one of the following phyla are characterized by "segmented body"?
Which one of the following is a "post-zygotic" isolating mechanism of speciation?
Imagine a population of diploid species in Hardy-Weinberg equilibrium. The population has two alleles for a gene which are ‘a’ and ‘A’. The number of individuals with ‘aa’ genotype in this population is 1 in 10000. The frequency of the allele ‘A’ in the population is ............ (up to two decimal places)
A PCR was setup to amplify a 500 nucleotides-long DNA. The dNTPs in the reaction mixture were radiolabeled. The percentage (%) of radiolabeled single-stranded DNA after three cycles will be ............ (up to one decimal place)
A polymerase chain reaction (PCR) based diagnosis test was performed on a bacterial sample targeting a specific gene. There are 3 copies of this gene in the bacterial genome. Prior to DNA extraction, the bacteria were incubated to allow one cycle of growth. 3072 amplicon copies were obtained after 9 cycles of the PCR. Assume 100% efficiency at each step. The initial bacterial count in the sample was ....... (Answer in integer)
Which one of the following is a "brood parasite"?
During the development of a mammalian embryo, "yolk sac" is formed by which one of the following?
Which one of the following metabolites is associated with bacterial stringent response?
India is aiming to be free of tuberculosis by 2025. One of the key approaches for this program is DOTS. Which one of the following options is the full form of DOTS?
A bacterium obtains energy from a chemical source by the oxidation of reduced \({NO}_2^{-}\), with \({CO}_2\) as the principal carbon source. Which one of the following nutritional groups does this bacterium belong to?
Identify the correct statement(s) with respect to plant disease:
Which of the following molecular approaches can be used to generate complete knock-out of a target gene in plants?
Consider a diploid plant species where the cells in the epidermis (the outermost single cell layer) always divide in the anticlinal orientation. If one such cell within the central zone of the shoot apical meristem (SAM) spontaneously becomes tetraploid at the seedling stage, which one of the following cellular arrangements would be most likely observed if the meristem is examined at the adult stage?
E. coli is grown exclusively in a medium containing \(^{15}NH_4Cl\) as the sole nitrogen source. Subsequently, the cells were shifted to a medium containing \(^{14}NH_4Cl\). The molar ratio of hybrid DNA (\(^{15}N-^{14}N\)) to light DNA (\(^{14}N-^{14}N\)) after four generations (rounded off to two decimal places) will be .......
Which one of the following mature cell types is live but usually lacks nucleus?
Which one of the following commercially important carbohydrates is naturally produced only by the members of the plant kingdom?
Which one of the following agents causes the necrotic ring spot disease in stone fruits?
Förster Resonance Energy Transfer does NOT depend on the
Peptide-binding cleft in MHC-I is formed by