Which of the following best explains the relationship between photosynthesis and cellular respiration? a) both produce carbon dioxide and oxygen. b) both require energy from the sunlight to occur. c) the products of one are the reactants of the other. d) a plant can carry out either one process or the other.

C

Explanation:

photosynthesis equation: 6CO2 + 6H2O —> C6H12O6 + 6O2

CR equation: C6H12O6 + 6O2 -->6CO2 + 6H2O + ATP

As you can see the products of photo are reactants of CR and vice versa

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.

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