Which statement describes how matter is cycled between plants and animals? A. Sugar from animals is used by plants for energy
B. Plants and animals produce oxygen for animals to breathe.
C. Carbon dioxide from animals is used by plants to form sugar.
D. Oxygen from animals is used by plants to get energy from sugar.

C

Explanation:

The animals releases carbon dioxide and the plant uses the carbon dioxide to make sugar

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.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.