The function of light is to excite a specialized chlorophyll in the reaction centre either by Direct absorption or more frequently, via energy transfer from an antenna pigment, This excitation process can be envisioned as

a.) An electron from the lowest-energy filled orbital of the chlorophyll to the highest-energy unfilled orbital

b.) An electron in the upper orbital is only tightly bound to the chlorophyll and is difficult to fetch the electron nearby molecules

c.)  The electron in the upper orbital is only loosely bound to the chlorophyll and is easily lost if a molecule that can accept the electron is nearby

d.) The promotion of an electron from the highest-energy filled orbital of the chlorophyll to the lowest-energy unfilled orbital

Which combination is CORRECT?

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#Question id: 358

#XL - Q Biochemistry

Consider the following reaction at equilibrium: CO2 + H2O ⇔ H2CO3. What would be the effect of adding additional H2O?

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#Question id: 359

#XL - S Microbiology

What is the concentration of OH− in a solution with an H+ concentration of 1.3 × 10^−4 M?

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#Question id: 359

#XL - Q Biochemistry

What is the concentration of OH− in a solution with an H+ concentration of 1.3 × 10^−4 M?

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#Question id: 360

#XL - S Microbiology

Which of the following is considered to be a strong base (alkali)?

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#Question id: 360

#XL - Q Biochemistry

Which of the following is considered to be a strong base (alkali)?

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#Question id: 361

#XL - S Microbiology

Calculate the percentage of histidine that has its imidazole side chain protonated at pH 7.3. The pKa values for histidine are pK1 = 1.8, pK2 (imidazole) = 6.0, and pK3 = 9.2.