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TLS Online TPP Program

#Question id: 12472

During the spring, you are studying the mice that live  in  a  field  near your home. There are lots  of  mice in  this field, but you realize that you rarely observe any reproductive females. This most likely indicates

#Unit 10. Ecological Principles
  1. That there is selective predation on female mice. 
  2. That female mice die before reproducing.
  3. That this habitat is a good place for mice to reproduce.
  4. That you are observing immigrant mice.
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TLS Online TPP Program

#Question id: 718

#Unit 1. Molecules and their Interaction Relevant to Biology

Poly- L -leucine in an organic solvent such as dioxane is a helical, whereas poly- L isoleucine is not. Why do these amino acids with the same number and kinds of atoms have different helix-forming tendencies?
TLS Online TPP Program

#Question id: 19223

#Unit 12. Applied Biology

Based on the DNA sequence of a commonly used binary vector some example are
1. pBIN19
2. pCB301
3. pBR322
Which of the following above statements are correct?
TLS Online TPP Program

#Question id: 14951

#Unit 6. System Physiology – Plant

Expansins belong to a large superfamily of proteins, divided into two major expansin families, α-expansins (EXPAs) and β-expansins (EXPBs), what is the function of these two?
a) EXPAs are more active on eudicot cell walls, whereas EXPBs are more active on grass cell walls
b) EXPAs are more active on grass cell walls, whereas EXPBs are more active on eudicot cell walls
c) EXPAs loosen cellulose–cellulose junctions containing xyloglucan, whereas EXPBs loosen wall complexes containing GAX
d) EXPAs loosen wall complexes containing GAX, whereas EXPBs loosen cellulose–cellulose junctions containing xyloglucan
Which combination is correct from some given above functions of expansins,?
TLS Online TPP Program

#Question id: 22024

#Unit 1. Molecules and their Interaction Relevant to Biology

Some of the statements regarding competitive inhibition are given below
a)  The effect of a competitive inhibitor depends on the inhibitor concentration, the substrate       concentration and the relative affinities of the substrate and the inhibitor for the enzyme.
b) if the substrate concentration is low, the degree of inhibition will be great.
c) the substrate concentration is high, then the degree of inhibition will be marked low
d) non-competitive inhibitor can combine with an enzyme molecule to produce a dead-end complex
Choose the incorrect statement
TLS Online TPP Program

#Question id: 1428

#Unit 4. Cell Communication and Cell Signaling

Which of the fundamental properties of cancer cells are likely to be lacking in leukemias?