The first step of photosynthesis is ......... .

  • A
    Attachment of $CO_2$ to a $3$-carbon sugar
  • B
    Formation of $ATP$
  • C
    Ionization of water
  • D
    Excitation of an electron of chlorophyll by a photon of light

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If $E$ is the Emerson effect,$x$ is the rate of oxygen production in a mixed beam of light,$y$ is the rate of $O_2$ production in low wavelength light (short wavelength),and $z$ is the rate of $O_2$ evolution in high wavelength red light,what will be the value of $E$?

In the grana,the process $ADP + P_i = ATP$ is called .........

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