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TLS Online TPP Program

#Question id: 5010

Which of the following steps has not yet been accomplished by scientists studying the origin of life? 

#Unit 11. Evolution and Behavior

  1. synthesis of small RNA polymers by ribozymes

  2. abiotic synthesis of polypeptides

  3. formation of molecular aggregates with selectively permeable membranes

  4. formation of protobionts that use DNA to direct the polymerization of amino acids

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TLS Online TPP Program

#Question id: 2269

#Unit 2. Cellular Organization

The rough ER is so named because it has an abundance of _______________ on it.
TLS Online TPP Program

#Question id: 12995

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following constraints affect the stability α-helix, 
a) the intrinsic propensity of an amino acid residue to form an α-helix.
b) the interactions between R groups.
c) the bulkiness of adjacent R groups.
d) the occurrence of Pro and Gly residues.
TLS Online TPP Program

#Question id: 19874

#Unit 13. Methods in Biology

Adding homopolymer tails to the 3’ end of DNA by an enzyme such as
TLS Online TPP Program

#Question id: 10814

#Unit 10. Ecological Principles

A Population of N1 species is growing with N2 species with a growth rate (r1) of 0.15 in an environment with a carrying capacity K1 of 400, Density of N1 species 100, density of N2 species 50 competitive efficiency of N2 on N1 species 1.5. What is the approximate growth rate N1 species?
TLS Online TPP Program

#Question id: 19451

#Unit 13. Methods in Biology

We use different lenses in combinations. The total magnification is represented as