TLS Online TPP Program

#Question id: 79


The structure of D-arabinose is shown below. How many stereoisomers are possible for this molecule?

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. One

  2. Four

  3. Six

  4. Eight

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TLS Online TPP Program

#Question id: 32327

#Unit 1. Molecules and their Interaction Relevant to Biology

If these 2 reactions are happening together the what will the overall free energy of the 

 

TLS Online TPP Program

#Question id: 27484

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is truly stating about the stereochemistry of D-Erythrose, L-Erythrose  and D-Threose and L-Threose

1. D-Erythrose, L-Erythrose are enantiomers to each other

2. D-Erythrose, L-Erythrose are diastereomers to each other

3. D-Erythrose and D-Threose are diastereomers to each other 

4. D-Erythrose, L-Erythrose are enantiomers to each other 

TLS Online TPP Program

#Question id: 13129

#Unit 10. Ecological Principles

Biologists performed an experiment with flies to examine the effects of population size on the maintenance of genetic variation  and  on  egg-to-adult survival.  From  a  large  source  population, they  randomly  assigned  eggs  to  three experimental  populations  of  size  N,  equal  to  20,  60,  and0100.  For  later  generations,  they  collected  N  eggs  from each  population  and  moved  them  into  identical  vials  that  co0ntained  f2re0sh  me4d0ium.  Th6e0y  coun8te0d  the  number  of adult flies that emerged and used tissue samples from the adults for genetic analyses. Genetic variation was measured by  scoring  alleles  at  several  polymorphic  loci  and  expressed  as  the  average  number  of  alleles  at  those  loci.  The results are summarized in Figure 1 and Figure 2 below.

Based on Figure 1, which of the following best describes the change in genetic variation over time? 

TLS Online TPP Program

#Question id: 24636

#Unit 2. Cellular Organization

The degree of supercoiling of bacterial DNA is maintained by regulation of the net activity of topoisomerases,

TLS Online TPP Program

#Question id: 31259

#Unit 5. Developmental Biology

During salamander limb regeneration, which of the following functionally equivalent to apical ectodermal ridge during normal limb development?