AP Biology : Understand structure and importance of ATP
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Example Questions
Example Question #1 : Cellular Energetics
Which is NOT a reason that the phosphoanhydride bonds of ATP are high energy?
Entropy is increased when bonds are broken
Repulsion of positively charged phosphate and negatively charged oxygen
Resonance stabilization of products of ATP hydrolysis
Large mass of phosphate provides significant energy when combusted
Large mass of phosphate provides significant energy when combusted
The phosphoanhydride bonds of ATP, or the bonds between phosphate molecules, are high energy. This is due to the close proximity of positively charged phosphate and negatively charged oxygen; these charges repel. Also, there is resonance stabilization of the products of ATP hydrolysis (ADP and Pi); thus ADP is more stable than ATP. Additionally, entropy is increased when ATP is hydrolyzed; the second law of thermodynamics states that the entropy of a system always increases.
Example Question #1 : Understand Structure And Importance Of Atp
Which is not part of an ATP molecule?
adenine
alpha phosphate, beta phosphate, and gamma phosphate groups
threonine
ribose sugar
threonine
ATP consists of 3 phosphate groups, a ribose sugar, and adenine.
Example Question #2 : Understand Structure And Importance Of Atp
Which is true of an ATP molecule?
When hydrolyzed, a phosphoanhydride bond is formed
It is used for long-term energy storage
When hydrolyzed, delta G> 0
It is unstable
It is unstable
ATP is unstable; there is close proximity of positively charged phosphate and negatively charged oxygen; these charges repel. When hydrolyzed, delta G is <0 (exergonic). ATP is not used for long term-energy storage, as it is unstable. When hydrolyzed, a phosphoanhydride bond is broken.
Example Question #1 : Understand Structure And Importance Of Atp
Which is true of ADP
It contains more energy than ATP
ATP is produced when ADP is broken down
It contains 3 phosphate groups
It contains 2 phosphate groups
It contains 2 phosphate groups
When ATP is hydrolyzed and a phosphoanhydride bond is broken, ADP and a phosphate are the products. ADP then has 2 phosphate groups.
Example Question #3 : Understand Structure And Importance Of Atp
Which cellular process produces ATP?
DNA synthesis
Na+/K+ pump
mitosis
Cellular respiration
Cellular respiration
Cellular respiration is the process through which ATP is produced through the oxidation of glucose.
Example Question #4 : Understand Structure And Importance Of Atp
What is the primary energy currency for cells?
GTP
ATP
oxygen
carbohydrate
ATP
ATP is the primary energy currency for cells. The phosphoanhydride bonds of ATP, or the bonds between phosphate molecules, are high energy. This is due to the close proximity of positively charged phosphate and negatively charged oxygen; these charges repel. Also, there is resonance stabilization of the products of ATP hydrolysis (ADP and Pi); thus ADP is more stable than ATP. Carbohydrates are broken down during glycolysis to produce ATP.
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