List of top Questions asked in GATE XL

In wild-type Arabidopsis thaliana, the four types of floral organs (sepal, petal, stamen, carpel) are arranged in concentric whorls from outside to inside. With reference to the ABC model of floral organ patterning, match the homeotic mutants in Group 1 with their respective arrangements of organs in the four whorls given in Group 2.
Group 1 Group 2
(P) A class mutants(i)sepal, sepal, carpel, carpel
(Q) B class mutants (ii) sepal, petal, petal, sepal 
(R) C class mutants(iii) carpel, stamen, stamen, carpel
 (iv) sepal, sepal, petal, petal
Which of the following combinations of plant diseases and the types of their causal organisms is/are CORRECT?
Match the inhibitors in Group 1 with their respective targets in Group 2.
Group 1 Group 2
P) Oligomycin(i) Cytochrome bc1 complex 
(Q) Antimycin A (ii) Photosystem II
(R) 3-(3,4-dichlorophenyl)-1, 1- dimethylurea (DCMU)(iii)K\(^+\) ionophore
(S) Valinomycin(iv) Fo ATP synthase
Match the inhibitors in Group 1 with their respective targets in Group 2.
Group 1 Group 2
(P) VirG(i) Kinase
(Q) VirA(ii) Helicase
(R) VirE(iii) Transcriptional activator
(S) VirC(iv) Single strand binding protein
Match the plant products in Group 1 with the plant species in Group 2 that produce them and the respective plant parts in Group 3 where they accumulate the most.
Group 1Group 2Group 3
(P) Liquorice(i) Cinchona calisaya(a) Leaf
(Q) Quinine(ii) Lawsonia inermis(b) Root
 (R) Henna(iii) Glycyrriza glabra(c) Flower
(S) Saffron(iv) Papaver somniferum(d) Bark 
 (v) Crocus sativus(e)  Seed
Match the plant products in Group 1 with the plant species in Group 2 that produce them and the respective plant parts in Group 3 where they accumulate the most.
Group 1Group 2
(P) Protocooperation(i) One species is harmed but the other is neither harmed nor benefitted
(Q) Commensalism (ii) A type of mutualism where one species is  benefitted more than the other
(R) Amensalism (iii)Both the species are benefitted but the interaction between them is not obligatory
(S) Helotism (iv) One species is benefitted without harming the other 
Match the plant products in Group 1 with the plant species in Group 2 that produce them and the respective plant parts in Group 3 where they accumulate the most.
Group 1Group 2
(P) Net primary productivity (i) Total amount of produced by autotrophs energy
(Q) Gross primary productivity(ii) A type of mutualism where one species is  benefitted more than the other
(R) Net productivity(iii)Amount of energy stored by autotrophs after respiration 
(S) Secondary productivity(iv) Unused amount of energy after consumption by heterotrophs
Which of the following plant diseases is/are caused by nematode?
Which of the following selectable marker genes is/are used for herbicide tolerance during genetic transformation of plants?
Which of the following statements is/are CORRECT with reference to rubber production from plants?
In Calvin-Benson cycle, to produce 1 molecule of glyceraldehyde 3-phosphate by fixing 3 molecules of carbon dioxide, 9 molecules of ATP and____ molecules (in integer) of NADPH are typically utilized.
Which of the following tissue types is/are established during embryogenesis in wild-type Arabidopsis thaliana?
A 5250 base-pair long plasmid with 10 negative supercoils would have a linking number of______,considering 10.5 base pairs per turn for B DNA. (Answer in integer)
In Michaelis-Menten's equation, if \([S] = 15 K_m\), then the ratio \( v_0/V_{max} \) is ____ (Round off to three decimal places).
The spectrum of a protein obtained using electrospray ionization mass spectrometry (ESI-MS) is shown below. Two peaks, one at m/z = 2960.6 and the other at m/z = 3552.5, are marked. The mass of the protein associated with the m/z = 2960.6 peak is____ Da. (Round off to two decimal places)
The spectrum of a protein obtained using electrospray ionization mass spectrometry (ESI-MS)
Which one of the following plant families does apple (Malus domestica) belong to?
Factor H, a complement regulatory protein in plasma, binds C3b and
The collateral and open type of vascular bundle with endarch xylem strand is usually found in
Which one or more of the following statements is/are correct in the processing of pre-mRNA in eukaryotes?
Which one or more of the following statements correctly describe(s) the changes upon the addition of puromycin during eukaryotic translation?
Which one or more of the following statements correctly describe(s) fluorescence spectroscopy?
Match the metabolic intermediates listed in Column I with their corresponding amino acids given in Column II.
Column IColumn II 
P. a-Ketoglutarate i. Histidine 
Q.Ribose 5-phosphate ii. Glutamate
R. 3-Phosphoglycerate iii.Aspartate
S. Phosphoenolpyruvateiv. Phenylalanine
 v.Serine
If a 10 mM solution of a biomolecule in a cuvette with a path length of 10 mm absorbs 90% of the incident light at 280 nm, the molar extinction coefficient of the biomolecule at this wavelength is ____ M\(^{-1}\)cm\(^{-1}\). (Round off to two decimal places)
Which one of the following is the correct match between the molecular properties listed in Column I and the corresponding biochemical separation methods in Column II?I.
Column IColumn II 
P. Solubilityi. Reverse phase chromatography
Q. Ionic chargeii. Ultracentrifugation
R. Polarityiii. Salting out
S. Molecular size iv. Isoelectric focusing
  v. Gel electrophoresis
Which one or more of the following statements is/are correct regarding the electromotive force generated by electron transfer chain?