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TLS Online TPP Program

#Question id: 749

Which of the following is correct for the A form of DNA structures?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. a wider than B form.

  2. more compressed structure in which the base pairs are tilted with respect to the helix axis, and actually lie off the axis.

  3. The helical repeat of the A-form is around 11 bp/turn

  4. All of the above are correct.

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TLS Online TPP Program

#Question id: 10828

#Unit 10. Ecological Principles

Not all parasitism involves feeding on the body of the host. The exception is
TLS Online TPP Program

#Question id: 11418

#Unit 10. Ecological Principles

Use the following diagram of five islands formed at around the same time near a particular mainland, as well as MacArthur and Wilson's island equilibrium model principles


Which island would likely have the lowest extinction rate?
TLS Online TPP Program

#Question id: 33899

#Unit 2. Cellular Organization

A. In E.coli, a natural closed DNA that is negatively supercoiled.
B. The intercalation of ethidium bromide first removes the negative supercoils and then introduces positive supercoils.
TLS Online TPP Program

#Question id: 11851

#General Aptitude

The greatest number of four digits which is divisible by 15, 25, 40 and 75 is :
TLS Online TPP Program

#Question id: 3986

#Unit 3. Fundamental Processes

Consider the lac operon of E. coli.  When there is neither glucose nor lactose in the growth medium: