Paraquat acts by accepting electrons that would otherwise reduce ferredoxin, and it can accept them from NADPH. The reduced form of paraquat then reacts with oxygen to form reactive oxygen species (in this case, O2–), which damage chloroplast lipids and cause plant death. Which of the following can you infer from this information?

- Paraquat uncouples proton transfer and ATP synthesis

- Paraquat prevents the reduction of plastoquinone (Q)

- Paraquat interrupts photosystem I function

- Paraquat can interfere with the formation or availability of NADPH

- Paraquat inhibits ferredoxin-NADP+ reductase

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any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

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1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.