Using the drop-down menus, identify the parts of
the lower respiratory system from the descriptions
below.
The
y are enclosed in a membrane
called the pleura.
The
are branch-like extensions
found in the lower respiratory system
Identify the structures labeled in the diagram to
the right
Label A
In the 1930s, medical journal
articles linked asbestos to cancer
DONE

wait any answer choices plz

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.

ucd e e. rr. t t t t t t. to

hello

answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this