Flashcards in 4.1.1 ATP Structure and Function Deck (10)
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1
Q
ATP (adenosine triphosphate)
A
- a triphosphorylated nucleotide that is used as a major
energy source by the cell. - a triphosphorylated nucleotide. Nucleotides are the building blocks of DNA and RNA.
- ATP is made up of ribose (a five-carbon sugar), the nitrogenous base adenine, and three phosphate groups. Phosphate groups consist of phosphate surrounded by oxygen atoms.
2
Q
high-energy bond
A
- means that when the bond is broken, energy is released.
- When energy is released from a reaction, that reaction has a negative ∆G. The ∆G of this reaction is negative because the products are more stable than the reactants (remember that the ∆G is equal to the final free energy minus the initial free energy).
- The phosphate bond in ATP is not very stable because the negative charges on the phosphate groups repel one another.
3
Q
The third phosphate bond is called a high energy bond because
A
- energy is released when the bond is broken
4
Q
ATP is used by the cell to
A
- synthesize biological molecules
- actively transport substances across the membrane
- generate force
5
Q
Which of the following statements regarding ATP is true?
A
- ATP is an energy-carrying molecule
6
Q
True or false?
ATP acts as a carrier of chemical energy.
A
- true
7
Q
ATP releases energy by:
A
- splitting into a phosphate ion and ADP
8
Q
Which statement about ATP is not true?
a. Water is used to break high energy bonds in ATP.
b. The formation of ATP from ADP + Pi is an endergonic reaction.
c. Part of the ATP molecule is a trisaccharide.
d. ATP is the energy currency of all cells.
A
- c. Part of the ATP molecule is a trisaccharide
9
Q
Adenosine triphosphate __________.
A
- has unstable bonds that are weaker than most covalent bonds in organic molecules
10
Q
True or false?
ATP is composed of the sugar ribose that has an adenine base and three phosphate groups.
A
- true