TLS Online TPP Program

#Question id: 7144


Heart development begins as

#Unit 5. Developmental Biology
  1. a folding process in the mesoderm below the notochord that is exactly like neural tube formation.
  2. an outgrowth of the endoderm above the gut that forms a tube that will become the heart.
  3. a pair of tubes in the lateral plate mesoderm that move together and fuse to form a single tube that will become the heart.
  4. a mesenchymal condensation below the notochord that forms the heart tube.
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TLS Online TPP Program

#Question id: 599

#Unit 1. Molecules and their Interaction Relevant to Biology

In a certain enzyme-catalyzed reaction the following steps occur:

1. A phosphate group on substrate A is transferred to a side chain of an active site residue of the enzyme.

2. The dephosphorylated form of substrate A dissociates from the enzyme.

3. Substrate B enters the active site and is phosphorylated with simultaneous regeneration of the enzyme in its original form.

What kind of kinetic mechanism is described?

TLS Online TPP Program

#Question id: 600

#Unit 1. Molecules and their Interaction Relevant to Biology

Two substances are used to produce a certain biological product in an enzyme-catalyzed reaction. It is found that both substrates must bind to the enzyme, first one, then the other before the product is produced. This is an example of a/an ________.

TLS Online TPP Program

#Question id: 601

#Unit 1. Molecules and their Interaction Relevant to Biology

In a ping-pong reaction which does not occur?

TLS Online TPP Program

#Question id: 602

#Unit 1. Molecules and their Interaction Relevant to Biology

An inhibitor binds to a site other than the active site of the enzyme. Which statement below correlates with this observation?

TLS Online TPP Program

#Question id: 603

#Unit 1. Molecules and their Interaction Relevant to Biology

Nonclassical competitive inhibition involves ________.

TLS Online TPP Program

#Question id: 604

#Unit 1. Molecules and their Interaction Relevant to Biology

An enzyme is irreversibly inhibited by diisopropylfluorophosphate (DFP). What does this show?