3 questions please help today

1) Serine has the mRNA codons

a. UCA, UGA, and UCC

b. AGU, UCG, and AGC

c. UCU, UCC, and AGA

d. AGU, AGG, and AGA












2)Some events that may occur during transcription
RNA polymerases detach.
DNA polymerases detach.
DNA polymerases proofread.
RNA double helix is unzipped.
DNA double helix is unzipped.
DNA double helix forms again.
Free nucleotides in the nucleus bond to exposed nucleotides of the sense strand. 
Free nucleotides in the nucleus bond to exposed nucleotides of the antisense strand.
mRNA is built in the 5′ to 3′ direction.
RNA ligase fuses the Okazaki fragments.
RNA polymerase binds to the sense strand.
DNA polymerase binds to the sense strand.
RNA polymerase binds to the antisense strand.
DNA polymerase binds to the antisense strand.

Listed in sequence, the events involved in DNA transcription numbered above are
Answer, Answer , Answer , Answer  and Answer
.










3) A DNA antisense strand contains the following nucleotide base sequence:

ACG TTT ATG GGT

From this, what is the nucleotide sequence of the mRNA strand that is transcribed?

a. ACG UUU AUG GGU

b. AGC UUU AUC CCU

c. TGC AAA TAC CCA

d. UGC AAA UAC CCA




b) How many amino acids does the mRNA strand above code for?