Which of the following are included in group 8a (sometimes referred to as group 18)? check all that apply. a. helium b. xenon c. potassium d. argon

The right options are;

A. Helium

B. Xenon

D. Argon

Group 8A elements of the periodic table are the noble gases which include helium, neon, argon, krypton, xenon, and radon.  These elements are inert or unreactive towards other elements or compounds because they have full set of valence electrons. They are colorless, odorless, and tasteless monatomic gases when they are at room temperature. They also have low boiling and melting points.

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.

what is the statement?