To determine which chemical equation correctly shows the relationship between [tex]$NADP ^{+}$[/tex] and NADPH, let's analyze each of the given options:
1. Option A: [tex]$NADP ^{+}+ H ^{+} \rightarrow NADPH$[/tex]
- This equation indicates that NADP[tex]$^{+}$[/tex] (Nicotinamide adenine dinucleotide phosphate) gains one proton ([tex]$H ^{+}$[/tex]) and gets reduced to form NADPH. This is a common reaction in biological systems, especially in photosynthesis and cellular respiration, where NADP[tex]$^{+}$[/tex] acts as an electron carrier.
2. Option B: [tex]$NADPH + ADP \rightarrow NADP^{+} + ATP$[/tex]
- This equation implies that NADPH reacts with ADP (adenosine diphosphate) to form NADP[tex]$^{+}$[/tex] and ATP (adenosine triphosphate). This reaction is not correct because it does not accurately describe the behavior and transformation between NADP[tex]$^{+}$[/tex] and NADPH.
3. Option C: [tex]$NADP ^{+} + P \rightarrow NADPH$[/tex]
- This equation suggests that NADP[tex]$^{+}$[/tex] combines with an unspecified species 'P' to form NADPH. This is unclear and does not represent a standard biochemical reaction.
4. Option D: [tex]$NADPH + ATP \rightarrow NADP^{+} ++^{+}$[/tex]
- This equation is incomplete and incorrect as it does not logically describe the transformation between NADP[tex]$^{+}$[/tex] and NADPH. Moreover, it incorrectly implies additional charges without specifying the products accurately.
Conclusion:
Analyzing all options, Option A is the correct chemical equation that shows the relationship between NADP[tex]$^{+}$[/tex] and NADPH as it accurately represents the reduction of NADP[tex]$^{+}$[/tex] to NADPH by the addition of a proton ([tex]$H ^{+}$[/tex]).
Therefore, the correct chemical equation is:
Option A: [tex]$NADP ^{+} + H ^{+} \rightarrow NADPH$[/tex].
