TLS Online TPP Program

#Question id: 385


In which reaction below does water not participate as a reactant (rather than as a product)?

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. Conversion of an acid anhydride to two acids.

  2. Conversion of an ester to an acid and an alcohol.

  3. Conversion of ATP to ADP.

  4. Production of gaseous carbon dioxide from bicarbonate.

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TLS Online TPP Program

#Question id: 23443

#General Aptitude

You are interviewed for a new job. Which of the following is most important to you?

TLS Online TPP Program

#Question id: 12707

#Unit 8. Inheritance Biology

AaBb=100% chance of crossing over between gene A and B than chance of  recombination?

TLS Online TPP Program

#Question id: 23454

#General Aptitude

You find a lady’s purse dropped on the road and on pocking it up, find a thousand rupees inside. You would:

TLS Online TPP Program

#Question id: 15153

#Unit 8. Inheritance Biology

In this problem we will explore some of the many ways that mutations in two different genes can interact to produce different Mendelian ratios. Consider a hypothetical insect species that has red eyes. Imagine mutations in two different unlinked genes that can, in certain combinations, block the formation of red eye pigment yielding mutants with white eyes. In principle, there are two different possible arrangements for two biochemical steps responsible for the formation of red eye pigment. The two genes might act in series such that a mutation in either gene would block the formation of red pigment. Alternatively, the two genes could act in parallel such that mutations in both genes would be required to block the formation of red pigment.
Further complexity arises from the possibility that mutations in either gene that lead to a block in enzymatic activity could be either dominant or recessive. If the crosses is made between a wild type insect with red eyes and a true breeding white eyed strain with mutations in both genes. Such considerations yield the Pathways in parallel with recessive mutations in both genes, determine the phenotype of the F1 progeny and the expected phenotypic ratio of red to white eyed insects in the F2.

TLS Online TPP Program

#Question id: 5289

#Unit 8. Inheritance Biology

A donor strain of bacteria with genes a+b+c+ is infected with phages to map the donor chromosome with transduction. The phage lysate from the bacterial cells is collected and used to infect a second strain of bacteria that are a_ b_ c_.

Based on the above, which one of the following conclusions is correct?