What are flagella and cilia? A. Extensions of the plasma membrane that help things cross the membrane
B. Extensions of the plasma membrane that help the cell move or help move things past
the cell
C. Membrane proteins that help things cross the membrane
D. Membrane proteins that help the cell move or help move things past the cell

Cilia and flagella are tube-like appendages which allow for motion in eukaryotic cells. ... The motion of the cilia or flagellum moves the liquid outside the cell and if the cell is not anchored, it can "swim." A commonly recognized example is the "tail" on a sperm cell, which is actually a flagellum.

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.