Protein synthesis and nucleic acids?

i got the following quesiton wrong on my test and we have to give the right answers for them and say why they are right and the other answer is wrong. it would help if you could answer as many quesitons as possible, but its okay if you do some. it would also be helpful if you explain why the answer is correct or... show more i got the following quesiton wrong on my test and we have to give the right answers for them and say why they are right and the other answer is wrong. it would help if you could answer as many quesitons as possible, but its okay if you do some. it would also be helpful if you explain why the answer is correct or how you came to that answer

1) If the DNA triplet base ACT codes fir threonine, all of the following will be true except for:
a. the codon coding for threonine is UGA
b. the tRNA carrying the amino acid threonine has the anticodon ACU
c. the anticodon ACU will complementary bind with UGA at the ribosome
d. the tRNA carrying the amino acid threonine has the anticodon UGA
e. if ACT is the fourth nucleotide triplet set in the gene (DNA) then threonine will be the fourth amino acid in the polypeptide chain

2) TAC CAC GAC TTC
A base substitution occurs to the fourth base in the DNA strand above. The fourth base now read T rather than C. What polypeptide sequence will it code for?
a. methionine-valine-leucine-lysine
b. meth-asparagine-leu-lys
c. meth-meth-leu-lys
d. val-leu-lys
e. meth-leu-lys

3) In terms of the polypeptide that they code for, which of the four is most similar to the sequence below?
TAC TTT TTG CTC ATC
a. ATC TTT TTG CTC ATC
b. TAC TTC TTA CTT ATC
c. TAC TTC TTG CTG ATC
d. TAC TTC TAG CTC ATC

4) In trying to determine whether DNA or protein was the genetic material, Al Hershey and Martha Chasemade use of which of the following facts?
a. DNA does not contain sulfur, whereas protein does
b. DNA contains phosphorous, but protein does not
c. DNA contains greater amounts of nitrogen than does protein
d. a and b only
e. a, b, c
1 answer 1