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Phosphorylation & Energy Transfer
Types of Phosphorylation
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Substrate-level phosphorylation
involves direct transfer of a phosphate group from a high-energy
compound to an
ADP molecule.
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Oxidative phosphorylation
produces ATP using energy from the electron transport chain.
-
Photophosphorylation
generates ATP using light energy in
photosynthesis.
Energy Transfer Molecules
-
ATP is
the primary energy currency of cells, storing energy in
phosphate bonds.
-
Creatine phosphate
is a molecule that serves as an energy reserve in muscle cells.
-
GTP is a
nucleotide used in protein synthesis and
signal transduction.
Dive deeper: The
creatine phosphate system is a rapid
source of ATP for short bursts of high-intensity activity, such as
sprinting or weightlifting. It works by transferring a phosphate group
from creatine phosphate to ADP, regenerating
ATP quickly. This system is particularly important in muscle cells during
the initial stages of exercise.While GTP is
primarily involved in protein synthesis and signal transduction,
ATP is more involved in energy transfer
within the cell.
Practice Questions
1. Which of the following describes the difference between substrate-level phosphorylation and oxidative phosphorylation? Type the letter of your answer: C
a. Oxidative phosphorylation involves direct transfer of a phosphate group to produce ATP, while substrate-level phosphorylation uses the electron transport chain.
b. Oxidative phosphorylation involves direct transfer of a phosphate group to hydrolyze ATP, while substrate-level phosphorylation uses the electron transport chain.
c. Substrate-level phosphorylation involves direct transfer of a phosphate group to produce ATP, while oxidative phosphorylation uses the electron transport chain.
d. Substrate-level phosphorylation involves direct transfer of a phosphate group to hydrolyze ATP, while oxidative phosphorylation uses the electron transport chain.
2. Which compound serves as a source for short bursts of energy in muscle cells? Type the letter of your answer: A
a. Creatine phosphate
b. Guanosine triphosphate
c. Adenosine triphosphate
d. NADH
3. Which nucleotide is primarily involved in protein synthesis and signal transduction? Type the letter of your answer: B
a. Adenosine triphosphate
b. Guanosine triphosphate
c. Creatine phosphate
d. Cyclic adenosine monophosphate