Enzyme X and Enzyme Y are both involved in monosaccharide metabolism. Enzyme X uses glucose as a substrate while Enzyme Y uses fructose as a substrate. At pH=7.0, Enzyme X has a Vmax of 10 μM/s while Enzyme Y has a Vmax of 20 μM/s. Both enzymes have a Km of 3.0 mM for their respective substrates. Which aspects of its reaction will be changed by Enzyme Y?

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:

TLS Online TPP Program

#Question id: 31088

#Unit 4. Cell Communication and Cell Signaling

In response to elevated IP3,Ca⁺² is able to move from the ER lumen into the mitochondrial matrix through the: 

TLS Online TPP Program

#Question id: 31089

#Unit 4. Cell Communication and Cell Signaling

An increase in [Ca²⁺]m in the mitochondrial matrix can increase:

TLS Online TPP Program

#Question id: 31090

#Unit 4. Cell Communication and Cell Signaling

Intramitochondrial calcium directly increases the activities of three mitochondrial enzymes, except:

TLS Online TPP Program

#Question id: 31091

#Unit 4. Cell Communication and Cell Signaling

In a cell signaling event, the enzyme that directly converts Pl(4,5)P2 to Pl(3,4,5)P3 is: