If you know a particular amino acid sequence, could you figure out the dna for that sequence why? or why not ?

GUC AGG AAA CCC

The dna is the script from which mRNA transcribes the message (for a protein). The mRNA creates a complementary string of nucleotides (So where there is a C the mRNA would put a G) except that mRNA uses U instead of T.

The mRNA then takes it to the cytoplasm, where it connects to a ribosome. tRNA go to the ribosome with an attached amino acid. Each tRNA has a codon that is complementary to a 3 letter set of mRNA (Since its complementary the G would be a C).

SO you can basically determine the tRNA when given the dna by simply replacing the T with U.

2.

A change in the nitrogen base will cause a different tRNA to match with the mRNA. (Each tRNA with its codon has a specific amino acid that it brings to the site of translation) This will change the protein because it will be made from a different chain than the original protein.

3.

No. There are repeats, more than one amino acid can be translated from a codon. There are about 22 standard amino acids while there are numerous different codons.

4.

You should be able to piece this together from my earlier explaination

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.