Domanda del libro di testo
Enzymes usually function best at an optimal pH and temperature. The following graph shows the effectiveness of two enzymes at various temperatures.
(a) At which temperature does enzyme A perform best? Enzyme B?
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3. Energy & Cell Processes
Enzymes
Scelta multipla
Which of the following enzymes adds a phosphate group to target proteins?
A
Ligase
B
Kinase
C
Phosphatase
D
Amylase
Guida verificata passo dopo passo1
Understand the role of enzymes in cellular processes. Enzymes are proteins that catalyze biochemical reactions, often by lowering the activation energy required for the reaction.
Identify the function of each enzyme listed in the problem. Ligase is an enzyme that joins two molecules together, often using ATP. Phosphatase is an enzyme that removes phosphate groups from proteins. Amylase is an enzyme that breaks down starch into sugars.
Focus on the enzyme 'Kinase'. Kinases are a specific type of enzyme that catalyze the transfer of phosphate groups from high-energy molecules like ATP to specific substrates, typically proteins.
Recognize that the addition of a phosphate group to a protein is known as phosphorylation, a key regulatory mechanism in cellular signaling and function.
Conclude that the enzyme responsible for adding a phosphate group to target proteins is a kinase, as it facilitates phosphorylation by transferring phosphate groups.
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