Practice Questions

TLS Online TPP Program

#Question id: 2873

With reference to aberrant methylation of bases which of the following statements, if any, is false?

#Unit 2. Cellular Organization

S-adenosylmethionine donates methyl groups to a range of different molecules in cells and frequently inappropriately methylates bases in DNA.
Guanine is occasionally methylated to give O-6-methylguanine which base pairs with adenine rather than with cytidine.
In each nucleated cell, about 300-600 adenines are converted to 3-methyladenine per day.
3-methyladenine can be a cytotoxic base: it distorts the double helix and that can disrupt crucial DNA-protein interactions.

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TLS Online TPP Program

#Question id: 12259

#Unit 10. Ecological Principles

Which of the following is an example of exploitation competition?

TLS Online TPP Program

#Question id: 23131

#Unit 2. Cellular Organization

How the minimum no. of proteome can be estimated

TLS Online TPP Program

#Question id: 29100

#Unit 8. Inheritance Biology

The adult flies that emerged had a eyeless mutation phenotype in Drosophila produces greatly reduced eyes.. When this eyeless fly was crossed to a known reduced eye mutant fly, all the progeny had normal phenotype. The observed phenotype can be best explained as an example of__

TLS Online TPP Program

#Question id: 5700

#Unit 8. Inheritance Biology

During meiosis, homologous chromosomes pair up along their lengths. The most plausible explanation for the karyotype structure shown above is that

TLS Online TPP Program

#Question id: 705

#Unit 1. Molecules and their Interaction Relevant to Biology

Proteins are classified within families or superfamilies based on similarities in: