TLS Online TPP Program

#Question id: 4127


Which one of the following statements about ribosomes is true?

#Unit 3. Fundamental Processes
  1. The large subunit contains rRNA molecules, the small subunit does not.

  2. The RNA in ribosomes plays a structural, not catalytic, role.

  3. There are about 25 of them in an E. coli cell.

  4. There are two major subunits, each with multiple proteins.

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TLS Online TPP Program

#Question id: 23176

#Unit 13. Methods in Biology

When we use a high-intensity light to permanently bleach the fluorochrome in the patch, there will initially be no fluorescence and it will look 

TLS Online TPP Program

#Question id: 10283

#Unit 6. System Physiology – Plant

How to Phosphofructokinase-1 (PFK-1) and Fructose 1,6-Bisphosphatase are reciprocally regulated ?

a) ATP inhibits PFK-1 by binding to an allosteric site and lowering the affinity of the enzyme for its substrate fructose 6-phosphate

b) citrate is also an allosteric regulator of PFK-1, high citrate concentration increases the inhibitory effect of ATP

c) FBPase-1, is strongly inhibited (allosterically) by AMP; when the cell’s supply of ATP is low (corresponding to high AMP), the ATP-requiring synthesis of glucose slows

d) AMP inhibits PFK-1 by binding to an allosteric site and lowering the affinity of the enzyme for its substrate fructose 6-phosphate

Which of the following statements of regulation of enzyme is correct?

TLS Online TPP Program

#Question id: 648

#Unit 1. Molecules and their Interaction Relevant to Biology

Enzyme catalysis is regulated by a number of mechanisms. Also, the flux through metabolic pathways must be regulated. Given the metabolic pathway below, which choice accurately describes the regulation of compound G levels?

TLS Online TPP Program

#Question id: 5270

#Unit 8. Inheritance Biology

In conjugation, transformation, or transduction, the recipient bacteria is most likely to accept donor DNA

TLS Online TPP Program

#Question id: 10230

#Unit 10. Ecological Principles

Closely related species whose populations are sometimes allopatric showing greater morphology similarity but in a sympatric with distinct morphology due to