A student states that this structural formula represents a hydrocarbon. A C atom is bonded above, below, and left to H, and to the right to a second C, which is in turn bonded to the right to an O; the O is bonded to the right to H. Is the student correct? Yes, a hydrocarbon is any compound that contains a carbon backbone. Yes, a hydrocarbon is any compound that contains hydrogen and oxygen. No, a hydrocarbon contains only carbon and hydrogen atoms. No, a hydrocarbon contains at least one double or triple bond.

the farther away the object is from the central star (the sun) it's gravitainal pull on the object is weaker when it is farther

explanation:

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.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: