Chapter 19 - HW

The electrons abstracted by the oxygen evolving center (OEC) are relayed to a ______. A) photosynthetic reaction center B) tyrosyl radical C) thylakoid D) H2O E) CF1CF0 F) Z-scheme G) NADPH H) plastoquinone I) H+ J) RuBP carboxylase K) CO2 L) 2 OH- M) O2

B

Which of the following is TRUE regarding the difference between chlorophyll structures and heme? A) Chlorophyll structures contain copper rather than iron. B) Chlorophyll structures typically have five rings while heme typically has four. C) Chlorophyll often has fewer R groups attached to the ring system that heme. D) Chlorophyll metal atoms coordinate to the nitrogen atoms from the ring where as heme iron atoms coordinate to carbon atoms. E) all of the above

B

Electrons abstracted from water by ___ are relayed to ___ via formation of a ____. A) OEC; P680+; plastoquinone B) PSII; cytochrome b6; plastoquinone C) OEC; P680+; tyrosyl radical D) OEC; cytochrome b6; tyrosyl radical E) OEC; P960+; tyrosyl radical

C

Which of the following is a product of the Calvin cycle? I. ATP II. Glyceraldehyde-3-phosphate III. NADPH IV. CO2 A) I only B) I, III C) II only D) II, IV E) I, III, IV

C

A radioactive labeled carbon entering the Calvin cycle as 14CO2 A) would be removed from the cycle as various carbohydrate side products in the first round of the cycle. B) could be identified only in the triose intermediates within the cycle. C) would only be observed in intermediates following three rounds of the cycle. D) could be observed in any of the intermediates within the cycle during the first or subsequent rounds of the cycle. E) would be rapidly removed by transketolase catalyzed reactions.

D

PSII oxidizes ____. A) photosynthetic reaction center B) tyrosyl radical C) thylakoid D) H2O E) CF1CF0 F) Z-scheme G) NADPH H) plastoquinone I) H+ J) RuBP carboxylase K) CO2 L) 2 OH- M) O2

D

Light activation of P680 results in which of the following? I. electron transfer as follows: QA → QB → Chl α → Pheo α II. electron transfer from PSI directly back to the Pheo α -QA complex III. reduction of S4 of the OEC to S1 of the OEC IV. reduction of cytochrome b6f A) I, III, IV B) I, II C) II, III D) I only E) IV only

E

The chloroplast ATP synthase is also called ______. A) photosynthetic reaction center B) tyrosyl radical C) thylakoid D) H2O E) CF1CF0 F) Z-scheme G) NADPH H) plastoquinone I) H+ J) RuBP carboxylase K) CO2 L) 2 OH- M) O2

E

Electron transport through the cytochrome b6f complex generates a _____ gradient. A) photosynthetic reaction center B) tyrosyl radical C) thylakoid D) H2O E) CF1CF0 F) Z-scheme G) NADPH H) plastoquinone I) H+ J) RuBP carboxylase K) CO2 L) 2 OH- M) O2

I

In the Calvin cycle, ______ is "fixed" to generate carbohydrate molecules. A) photosynthetic reaction center B) tyrosyl radical C) thylakoid D) H2O E) CF1CF0 F) Z-scheme G) NADPH H) plastoquinone I) H+ J) RuBP carboxylase K) CO2 L) 2 OH- M) O2

K