List of top Life Science Questions asked in GATE Life Sciences

In the history of photosynthetic research, the empirical reaction of photosynthesis was first proposed for green plants (equation 1), followed by another reaction for purple sulfur bacteria (equation 2), leading to a generalized equation for photosynthesis (equation 3), where \( {H}_2{A} \) in equation 3 is a generalized electron donor.
\[ {CO}_2 + {H}_2{O} \xrightarrow{{light}} {(CH}_2{O)} + {O}_2 \quad {(equation 1)} \] \[ {CO}_2 + 2{H}_2{S} \xrightarrow{{light}} {(CH}_2{O)} + {H}_2{O} + 2{S} \quad {(equation 2)} \] \[ {CO}_2 + 2{H}_2{A} \xrightarrow{{light}} {(CH}_2{O)} + {H}_2{O} + 2{A} \quad {(equation 3)} \] Where \( {H}_2{A} \) in equation 3 is a generalized electron donor. Which one of the following statements is DISPROVEN by equation 3?
 

If an egg cell of a diploid plant species has 10 chromosomes, the expected number of chromosomes in a double trisomic somatic cell of this species would be ............. (Answer in integer).

Correctly match the carnivorous plants (Group I) with the organs (Group II) they modify to trap the prey:

Phospholipid vesicles prepared in 50 mM KCl were diluted in water. Based on this information, statements P and Q are made.
P: The diluted vesicles will develop membrane potential.
Q: There is a K+ concentration difference across the vesicular membrane.
Which one of the following options is correct?
 

Which one of the following ion channels opens to repolarize the neuronal membrane when an action potential is generated?
In a typical grinding operation, 80% of the feed material passes through a sieve opening of 4.75 mm; whereas, 80% of the ground product passes through 0.5 mm opening. If the power required to grind 2 tonnes/h of the feed material is 3.8 kW, the work index of the material is ........ (rounded off to 2 decimal places)
The true density and bulk density of wheat grains are 1280 kg/m\(^3\) and 740 kg/m\(^3\), respectively. The porosity of the grains is ......... (rounded off to 2 decimal places).
Identify the gas composition (in percent) suitable for packaging cured meat under MAP conditions.
Which of the following sequence of events occurs during the formation of egg-white gel?
Which of the following genetic disorders is/are caused by trinucleotide repeat expansions?
The mother and the father of five children are carriers (heterozygous) of an autosomal recessive allele that causes cystic fibrosis. The probability of having exactly three normal children among five is ........ (up to two decimal places).
An enzyme, which follows Michaelis-Menten equation, catalyzes the reaction A\(\rightarrow\)B. When enzyme and substrate concentrations are 15 nM and 10 \(\mu\)M, respectively, the reaction velocity is 5 \(\mu\)M s\(^{-1}\). If \(K_m\) for the substrate A is 5 \(\mu\)M, the kinetic efficiency of the enzyme will be ______ \(\times 10^6\) M\(^{-1}\) s\(^{-1}\) (in integer).
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)
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?
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?