1.plants produce carbon dioxide and water in the process of photosynthesis(true or false?) 2.most organisms depend on plants for oxygen(true or false?)

3.glucose is produced in the mitochondria of plants(true or false?)

4.cellular respiration occurs only in animals(true or false?)

5.chloroplasts release energy when they break down glucose(true or false)

6.both plants and animals depend on the carbon dioxide oxygen cycle(true or false?)

Explanation:

1. true

2. true

3. false

4. false

5. true

6. true

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.