Apoint mutation changes a codon in an mrna molecule. will the mutation affect the polypeptide that forms? why?
a. yes. each amino acid is specified by only one codon.
b. no. the structure of dna, and not rna, determines the polypeptide
c. maybe. some codons are translated into two or more amino acids.
d. maybe. some sets of codons are translated into the same amino acid.

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on