Relate dna transcript and translation in genetics

Acertain species of fish can have either long or short fins. the allele for long fins is dominant over the allele for short fins. a heterozygous, long-finned fish is crossed with a homozygous, short-finned fish. of the offspring, will have long fins and be , and will have short fins and be .

The first amino acid of a new polypeptide chain is

Which of these parts of the membrane large moecules pass through it ?