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TLS Online TPP Program

#Question id: 453

Which statement does not explain why many biochemical processes are carried out via multi-step pathways rather than by single-step reactions (or only a few steps)

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. Multi-step pathways allow for more control points to regulate biochemical processes.

  2. The end products of most pathways can usually be produced only by the pathway reactions that nature has evolved.

  3. Sharing of intermediates between pathways is facilitated this way.

  4. There is greater control over the amounts of energy that are consumed or released at any one time.

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TLS Online TPP Program

#Question id: 31082

#Unit 4. Cell Communication and Cell Signaling

Family of IP3-gated Ca+2 channel proteins is similar in structure to the family of voltage-sensitive Ca+2 channels that are called:
TLS Online TPP Program

#Question id: 31083

#Unit 4. Cell Communication and Cell Signaling

The rise in the cytosolic Ca2+ level is transient because: 
TLS Online TPP Program

#Question id: 31084

#Unit 4. Cell Communication and Cell Signaling

Opening of IP3-gated Ca2+ channels in the endoplasmic reticulum leads to an increase in Ca2+ in the:
a) Cytosol
b) ER lumen
c) Mitochondrial matrix
d) Trans golgi

Which of the following is correct?
TLS Online TPP Program

#Question id: 31085

#Unit 4. Cell Communication and Cell Signaling

IP3/DAG signaling is terminated when: 
TLS Online TPP Program

#Question id: 31086

#Unit 4. Cell Communication and Cell Signaling

A small change in the level of cytosolic Ca+2 leads to a large change in the level of active calmodulin because:
TLS Online TPP Program

#Question id: 31087

#Unit 4. Cell Communication and Cell Signaling

For smooth muscle contraction, Ca2+-calmodulin complex activates: