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TLS Online TPP Program

#Question id: 1084

Which observation suggested to Sutherland the involvement of a second messenger in epinephrine's effect on liver cells?

#4. Cell Communication and Cell Signaling

  1. Receptor studies indicated that epinephrine was a ligand.

  2. Glycogen breakdown was observed only when epinephrine was administered to intact cells.

  3. Glycogen breakdown was observed when epinephrine and glycogen phosphorylase were combined in a cell-free system.

  4. Epinephrine was known to have different effects on many types of cells.

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TLS Online TPP Program

#Question id: 944

#1. Molecules and their Interaction Relevant to Biology

Because they lack aspartate kinase and aspartate semialdehyde dehydrogenase, ________ cannot synthesize lysine, methionine or threonine.
TLS Online TPP Program

#Question id: 945

#1. Molecules and their Interaction Relevant to Biology

A key precursor in the synthesis of aromatic amino acids (tryptophan, tyrosine and phenylalanine) is ________.
TLS Online TPP Program

#Question id: 946

#1. Molecules and their Interaction Relevant to Biology

Aspartate is the precursor for which of the following amino acids?
TLS Online TPP Program

#Question id: 947

#1. Molecules and their Interaction Relevant to Biology

 Which is not part of the synthesis reactions for histidine?
TLS Online TPP Program

#Question id: 1016

#4. Cell Communication and Cell Signaling

Lyme disease is an example of a disease
TLS Online TPP Program

#Question id: 1017

#4. Cell Communication and Cell Signaling

The outbreak of measles within the last few years was due to