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TLS Online TPP Program

#Question id: 762

Regarding the sugar residues in nucleic acids, which, if any, of the following statements is incorrect?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. The sugar is always based on a heterocyclic ring that consists of one oxygen atom and four carbon atoms, one of which is connected to a fifth carbon atom, the 5’ carbon atom.

  2. The internal sugar residues in a DNA strand normally have free hydroxyl groups, unlike those in an RNA strand.

  3. Bases are covalently linked to the carbon 1’ atoms of the sugars.

  4. Neighboring sugar residues are linked to each other by a phosphodiester bond that connects the 3’ carbon atom on one sugar to the 5’ carbon atom of its neighbour.

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TLS Online TPP Program

#Question id: 24209

#Unit 1. Molecules and their Interaction Relevant to Biology

Two enzyme having same reaction mechanism using same cofactor such as PDC and KDC
TLS Online TPP Program

#Question id: 24208

#Unit 1. Molecules and their Interaction Relevant to Biology

What is the true substrate for hexokinase
TLS Online TPP Program

#Question id: 14146

#Unit 1. Molecules and their Interaction Relevant to Biology

Match the following

A. Cyanide 1. Inhibit cytochrome oxidase

B. Piericidin A 2. Prevent electron transfer from Fe-S center to ubiquinone

C. Antimycin A 3. Blocks electron transfer from cytochrome b to cytochrome c1

D. Valinomycin 4. K+ ionophore
TLS Online TPP Program

#Question id: 543

#Unit 1. Molecules and their Interaction Relevant to Biology

If glucose labeled with 14C at C-1 (the aldehyde carbon) were metabolized in the liver, the first radioactive pyruvate formed would be labeled in:
TLS Online TPP Program

#Question id: 542

#Unit 1. Molecules and their Interaction Relevant to Biology

Hamsters love to run on exercise wheels. Prolonged running at a high rate of speed requires ATP. Could a hamster with a defective gene for the enzyme lactate dehydrogenase meet the extra ATP demand for prolonged, fast wheel-running by maintaining a high rate of glycolysis? Why or why not?
TLS Online TPP Program

#Question id: 541

#Unit 1. Molecules and their Interaction Relevant to Biology

The overall △G for glycolysis is -72 kJ/mol in erythrocytes. Which statement below is true?

A) The value of △G0ʹ is also -72 kJ/mol since the cytosol pH is close to 7.

B) The free energy of glycolysis is found as the sum of the standard free energy changes for

the individual pathway reactions.

C) The negative sign of △G shows that this pathway will proceed toward product (pyruvate) under normal cellular conditions.