Sonia is studying where oxygen goes in the body. She investigates how oxygen moves from the bloodstream Into the cells. Based on this
evidence which structure is Sonia most likely to examine in this work?
A) the veins
B) the heart
C) the capillaries
D) the lymph nodes

A) the veins.

Explanation:

The movement of oxygen through the body is crucial for maintaining life in the body. In the body, oxygen is absorbed in the lungs and then further spread to the body. The body must be continuously supplied with oxygen through the bloodstream because there are no oxygen reserves in the body. Circulating oxygen through the body is a prerequisite for the health of the organism, the function of the brain, heart, and all other organs.

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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.