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TLS Online TPP Program

#Question id: 5543

What is the purpose of the chorion in terrestrial vertebrate embryos?

#Unit 5. Developmental Biology

  1. To keep the embryo moist

  2. To exchange oxygen and carbon dioxide with the environment

  3. To absorb nutrients stored in yolk

  4. To store nitrogenous waste

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TLS Online TPP Program

#Question id: 673

#Unit 1. Molecules and their Interaction Relevant to Biology

How many complete turns are there in an ideal α-helix that contains 15 amino acids and has a pitch of 0.54 nm and a rise of 0.15 nm?
TLS Online TPP Program

#Question id: 17075

#Unit 12. Applied Biology

What are the disadvantages of using polyclonal antibodies?
TLS Online TPP Program

#Question id: 410

#Unit 1. Molecules and their Interaction Relevant to Biology

For the reaction A -> B, the Keq' is 10^4.  If a reaction mixture originally contains 1 mmol of A and no B, which one of the following must be true?
TLS Online TPP Program

#Question id: 2093

#Unit 2. Cellular Organization

Which of the following is transmembrane proteins?
TLS Online TPP Program

#Question id: 3869

#Unit 3. Fundamental Processes

Which one of the following statements about E. coli RNA polymerase (core enzyme) is false?