Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 721
TLS Online TPP Program

#Question id: 739

What is true about the rotation about bonds in a protein backbone?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. The rotation is free about all bonds in the backbone, except for the bond between the nitrogen and the alpha carbon in proline residues.

  2. The bond between the carbonyl carbon and nitrogen is restricted. Other bonds are free to rotate depending only on steric hindrance or the presence of proline residues.

  3. All bonds in the backbone have restricted rotation and partial double-bond character.

  4. The rotation is free only about the peptide bond. The other bonds are restricted by steric hindrance and the presence of proline residues.

More Questions
TLS Online TPP Program

#Question id: 12766

#Unit 10. Ecological Principles

Which of the following statements about the evolution of life histories is correct? 
TLS Online TPP Program

#Question id: 12767

#Unit 10. Ecological Principles

Your friend comes to you with a problem. It seems his shrimp boats aren’t catching nearly as much shrimp as they used to. He can’t understand why because originally he caught all the shrimp he could handle. Each year he added a  new  boat,  and  for  a  long  time  each  boat  caught  tons  of  shrimp.  As  he  added  more  boats,  there  came  a  time when each boat caught somewhat fewer shrimp, and now, each boat is catching a lot less shrimp. Which of the following topics might help your friend understand the source of his problem?
TLS Online TPP Program

#Question id: 12768

#Unit 10. Ecological Principles

Carrying capacity is
TLS Online TPP Program

#Question id: 12769

#Unit 10. Ecological Principles

Which of the following graphs refer to this equation? 
TLS Online TPP Program

#Question id: 12770

#Unit 10. Ecological Principles

Which of the following graphs illustrates the population growth curve of single bacterium growing in a flask of ideal medium at optimum temperature over a 24 -hour period? 
TLS Online TPP Program

#Question id: 12771

#Unit 10. Ecological Principles

Which of the following graphs illustrates the growth curve of a small population of rodents that has grown to reach a static carrying capacity?