Multiple Choice
What type of enzyme is responsible for adding a phosphate group to another protein?
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8. Respiration
Types of Phosphorylation
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What is meant by substrate-level phosphorylation?
A
It is the direct transfer of a phosphate group to ADP from a phosphorylated intermediate.
B
It is the process of generating ATP through the movement of protons across a membrane.
C
It is the phosphorylation of ADP using light energy in photosynthesis.
D
It is the addition of a phosphate group to ADP using energy derived from the electron transport chain.
Verified step by step guidance1
Substrate-level phosphorylation is a process that occurs during cellular respiration and involves the direct transfer of a phosphate group to ADP.
This transfer occurs from a phosphorylated intermediate, which is a molecule that has a phosphate group attached to it.
Unlike oxidative phosphorylation, substrate-level phosphorylation does not involve the electron transport chain or chemiosmosis.
It typically occurs in the cytoplasm during glycolysis and in the mitochondria during the Krebs cycle.
The key aspect of substrate-level phosphorylation is that it directly generates ATP without the need for a proton gradient or membrane-bound ATP synthase.
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