Question

second position
u c a g
first position (5 end)
u uuu
uuc phe ucu
ucc ser uau
uac tyr ugu
ugc cys
u
c
uua
uug leu uca
ucg uaa stop uga stop
a
uag stop ugg trp g
c cuu
cuc leu ccu
ccc pro cau
cac his cgu
cgc arg
c
a
cua
cug cca
ccg caa
cag gln cga
cgg g
a auu
auc ile acu
acc thr aau
aac asn agu
agc ser
u
c
aua
aug met start acg aaa
aag lys aga
agg arg
g
g guu
guc val gcu
gcc ala gau
gac asp ggu
ggc gly
u
c
a
gua
gug gca
gcg gaa
gag glu gga
ggg
initiation termination
which codons encode the same amino acid that the codon uua codes for? select all that apply.
☐ cuu
☐ cua
☐ uug
☐ cug
☐ uuu

Explanation:

Step1: Identify amino acid for UUA

From the codon table, UUA codes for Leu (Leucine).

Step2: Check each option's amino acid

• CUU: In the table, CUU (first position C, second U, third U) is in the Leu group (first position C, second U, third U/C/A/G all Leu). So CUU codes for Leu.
• CUA: CUA (first C, second U, third A) is in the Leu group (first C, second U), so codes for Leu.
• UUG: UUG (first U, second U, third G) is in the Leu group (first U, second U), so codes for Leu.
• CUG: CUG (first C, second U, third G) is in the Leu group (first C, second U), so codes for Leu.
• UUU: UUU (first U, second U, third U) codes for Phe (Phenylalanine), not Leu.

Answer:

CUU, CUA, UUG, CUG