1)Individual molecules that absorb light are called: A) pigments B) chloroplasts
ID: 176327 • Letter: 1
Question
1)Individual molecules that absorb light are called:
A) pigments
B) chloroplasts
C) RuBisCO
D) chromophores
E) terminals
2)What are the excited electrons used for that are generated from photosystems?
A) to reduce (fix) carbon from CO2
B) to drive the F1F0 ATP synthetase
C) to make water
D) to generate a proton gradient
E) to reduce pyruvate
3) What are the exited electrons used for that are generated from photosystems?
A) to reduce (fix) carbon from CO2
B) to drive the F1F0 ATP synthetase
C) to make water
D) to generate a proton gradient
E) to reduce pyruvate
4)What enzyme can “fix” the carbon from CO2?
A) LDH
B) photosystem I
C) photosystem II
D) pyruvate decarboxylase
E) RuBisCO
5) What central metabolite is generated by the action of RuBisCO?
A) glucose
B) fructose-1,6-bisphosphate
C) ATP
D) 3-P-glycerate
E) 3-P-glyceraldehyde
6) What amino acid accepts phosphate in a response regulator?
A) histidine
B) alanine
C) cysteine
D) aspartic acid
E) asparagine
7) In most two-component systems, what is responsible for resetting / lowering the phosphate levels on the response regulators?
A) reduction by quinones
B) the partner histidine kinase
C) acetyl phosphate
D) another response regulator
E) pyruvate dehydrogenase complex
8) What is an important feature of the binding interface between histidine kinases and response regulators?
A) they allow gene duplications
B) it prevents water contact with the PO4
C) it allows electron transport
D) it allows insulation between different two-component systems
E) all of the above
Explanation / Answer
1 A Pigments
Pigments are highly conjugated rings which absorbs light photons and excited to the change of the different levels, so that it transfers the electron inorder to generate energy or other response from the nucleus.
2 B to drive F0/F1 ATP synthase,
the electrons are excited and transferred through photosystems by redox reaction in pheophytin and cytochrome b6f ultimately invovles in the generation of ATp, photosynthesis is couple with photo phosphorylation for generation of ATP energy.
3.
B to drive F0/F1 ATP synthase,
the electrons are excited and transferred through photosystems by redox reaction in pheophytin and cytochrome b6f ultimately invovles in the generation of ATp, photosynthesis is couple with photo phosphorylation for generation of ATP energy.
4.E RUBISCO, this is key enzyme which regulates and fixes CO2 into carbon by calvin cycle or C3 cycle. The CO2 is fixed into 3phosphoglycerate by the enzyme Ribulose 1,5 Bis phosphate carboxylase/ oxygenase.
5 D 3 Phosphoglycerate.
6 D Aspartic acid, accepts the phosphate in the response regulator.
7 B the patner histidine kinase,
Explanation : Two component system is an ubiquitious sensor in prokaryotes which consists of histidine kinase as regulator protein for signal transducer,which facilitates phosphotransferase activity which inhibited by sodium ions. eg In cyanobacteria.
8 D it allows insulation between two component systems. it protects the two component system proteins.
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