What changes with a mutation?

Question

a. nucleotide sequence of DNA
b. nucleotide sequence of RNA
c. amino acid sequence of a protein
d. activation of a gene
e. structure of ribosomes

Answer 1

is A. the sequence changes by addition/deletion or change in the sequence of the nucleotide. if A occurs, b c d e occurs as result of the A

Answer 2

A, B, and C; a mutation would change the nucleotide sequence of DNA which in turn change the RNA during transcription and create a different protein in translation.

Hormones are the only things that activate a gene resulting in introns that get snipped out of the RNA.
A ribosome is just a ribosome. It does not get changed

Answer 3

It can be A, B, C, and D. Initially, if A is changed by a missense mutation (codes for a different amino acid) or nonsense (causes a stop codon), but not a silent mutation because it doesn't change the sequence, then the whole cascade of events to follow will be interupted/changed. You will get a different RNA seq, a different amino acid seq, and then activation of a gene may or may not take place.

Hormones may activate genes, but where do you think the signal comes from for the hormones to be released? They aren't the only thing. Take developmental biology.

Answer 4

a.
Like Yany said, silent mutations.

A change in the DNA nucleotide sequence changes the RNA sequence. But each amino acid has more than one codon coding for it, so sometimes a change in the RNA will not affect the amino acid sequence.

Answer 5

C
(you can have a point mutation in either DNA or RNA (as a result of mistranslation), but the important thing is to not have changed the resulting amino acid that codes a protein; a single amino acid substitution can be lethal).

Answer 6

Yany has the best answer...the answer is A.

Most mutations are neutral and thus do not change anything that is transcribed/translated. For example, a mutation in junk DNA would have no affect on gene expression or protein synthesis.

Answer 7

I think a is the answer.

Answer 8

its a