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.

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TLS Online TPP Program

#Question id: 4715

#Unit 11. Evolution and Behavior

Claytonia virginica is a woodland spring herb with flowers that vary from white, to pale pink, to bright pink. Slugs prefer to eat pink-flowering over white-flowering plants (due to chemical differences between the two), and plants experiencing severe herbivory are more likely to die. The bees that pollinate this plant also prefer pink to white flowers, so that Claytonia with pink flowers have greater relative fruit set than Claytonia with white flowers. A researcher observes that the percentage of different flower colors remains stable in the study population from year to year. Given no other information, if the researcher removes all slugs from the study population, what do you expect to happen to the distribution of flower colors in the population over time?

TLS Online TPP Program

#Question id: 4716

#Unit 11. Evolution and Behavior

Which of the following is correct match?

AWallaceI Changes in allele frequency due to random genetic drift
BSewall WrightII Evolution by natural selection
CCarl WoeseIII hybrid sterility
DHaldane's ruleIV DNA sequencing led to molecular phylogenetics

TLS Online TPP Program

#Question id: 4717

#Unit 11. Evolution and Behavior

 If Darwin had been aware of genes and their typical mode of transmission to subsequent generations, with which statement would he most likely have been in agreement?

TLS Online TPP Program

#Question id: 4718

#Unit 2. Cellular Organization

All the following statements about destruction of cyclins are true, except:

TLS Online TPP Program

#Question id: 4719

#Unit 8. Inheritance Biology

When a trait exhibits complete co-dominance rather than complete dominance, a cross between heterozygote results deviation of following;

TLS Online TPP Program

#Question id: 4720

#Unit 8. Inheritance Biology

Which of the following phenomenon, the differential expression of genetic material depending on whether it is inherited from the male or female parent, is called