4.1.1 ATP Structure and Function Flashcards Preview

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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

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