TLS Online TPP Program

#Question id: 81


The Fischer projections of linear D-glucose and D-galactose are shown below. These two molecules are

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

  2. enantiomers

  3. anomers 

  4. structural (constitutional) isomers

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TLS Online TPP Program

#Question id: 4714

#Unit 11. Evolution and Behavior

After the drought of 1977, researchers hypothesized that on the Galápagos Island Daphne Major, medium ground finches with large, deep beaks survived better than those with smaller beaks because they could more easily crack and eat the tough Tribulus cistoides fruits. A tourist company sets up reliable feeding stations with a variety of bird seeds (different types and sizes) so that tourists can get a better look at the finches. Which of these events is now most likely to occur to finch beaks on this island?

TLS Online TPP Program

#Question id: 10476

#Unit 1. Molecules and their Interaction Relevant to Biology

Following statements are regarding to gangliosides.

A. They are ceramides with attached oligosaccharides that include at least one sialic acid residue.

B. They are ceramides with attached oligosaccharides that include at least one phasphatidic acid residue.

C. Sialic acid gives gangliosides the negative charge at pH 7 that distinguishes them from globosides.

D. Gangliosides are primarily components of cell-surface membranes and constitute a significant fraction (6%) of brain lipids.

Which of the following combination is correct?

TLS Online TPP Program

#Question id: 72

#Unit 1. Molecules and their Interaction Relevant to Biology

For the reaction catalyzed by the enzyme hexokinase: Glucose + ATP → glucose 6-phosphate + ADP the equilibrium constant, Keq, is 7.8 × 102. In living E. coli cells, [ATP] = 5 mM, [ADP] = 0.5 mM, [glucose] = 2 mM, and [glucose 6-phosphate] = 1 mM. Which of the following conclusions made on the basis of the above calculations is incorrect?

TLS Online TPP Program

#Question id: 3965

#Unit 3. Fundamental Processes

Eukaryotes regulate gene expression at all of the following levels except:

TLS Online TPP Program

#Question id: 18749

#Unit 13. Methods in Biology

All the molecules generated during PCR will not be full length. Some will also be of intermediate length. Which of the statements is correct?