Life Sciences
GATE XL topic:biological-sciences PYQs
Build your understanding with focused practice from past exam papers.
Questions 211–220 of 1235. Imported answers require independent review unless marked reviewed.
Question 89
Open questionXL-TMCQ1 markNeeds review
Desmosomes are
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Open questionXL-TMCQ1 markNeeds review
The “foramen of Panza” is found in which one of the following groups of animals?
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Open questionXL-TNAT1 markNeeds review
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 1000. The frequency of the allele ‘A’ in the population is ______ (up to two decimal places)
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Open questionXL-TNAT1 markNeeds review
A PCR was setup to amplify a 500 nucleotides-long DNA. The dNTPs in the reaction mixture were labeled. The percentage (%) of radiolabeled single-stranded DNA after three cycles will be ______ (up to one decimal place)
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Open questionXL-TMCQ2 marksNeeds review
Match the molecules in Column-I with their properties/functions mentioned in Column-II
Column-I Column-II
P. IgM 1. Involved in antigen presentation
Q. IgE 2. Predominant antibody type in various body secretions
R. IgA 3. Can pass through placenta
S. MHC 4. Associated with allergic reaction
5. Contains ten heavy and light chains
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Open questionXL-TMCQ2 marksNeeds review
Match the following human diseases in Column-I with their causal organism in Column-II.
Column-I: P. Sleeping sickness; Q. Chagas disease; R. Elephantiasis; S. Lyme disease
Column-II: 1. Trypanosoma cruzi; 2. Trypanosoma brucei; 3. Borrelia burgdorferi; 4. Wuchereria bancrofti; 5. Rickettsia rickettsii
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Open questionXL-TMCQ2 marksNeeds review
Match the molecules in Column-I with their correct property/function in Column-II.
Column-I: P. RNase P; Q. RNA Polymerase-I; R. siRNA; S. Guide RNA
Column-II: 1. rRNA gene transcription; 2. Gene silencing; 3. Cas9-mediated genome editing; 4. Ribozymes; 5. tRNA gene transcription
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Open questionXL-TMCQ2 marksNeeds review
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.
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Open questionXL-TMSQ2 marksNeeds review
Nucleosomes are made up of DNA and histones. Histones undergo various kind 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)?
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Open questionXL-TMSQ2 marksNeeds review
The expression of a gene is regulated by a transcription factor. Which of the following techniques can be used to identify the region in its promoter where the transcription factor binds?
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