What effect, if any, did a change to the DNA code have on the amino acid sequence (protein polymer)?

A change to the DNA sequence may or may not change the functionality of the protein, make an inactive protein, or prevent production of the protein.

Explanation: NO SEQUENCE SHOWN, but generally

A gene codes for a protein. A change in one nucleotide (single nucleotide polymorphism - SNP) can have several different consequences. The deletion or insertion of a nucleotide also has consequences

The protein-making part of the gene is organised into codons - groups of three nucleotides who sequences make up the genetic code. Changes may have any of these consequences for the protein:

1. No consequence: there are redundancies in the code and an SNP may not change the meaning of the codon, especially if it is the third nucleotide

Example: CGT --> CGA  these both code for serine, so no change

2. No consequence: an SNP may change the amino acid, but if this is not at a critical part of the protein and/or the amino acids have similar properties it will not affect the end product

Example: ACT --> CCT = isoleucine --> leucine

3. An SNP affects protein folding or the active site. This can alter or prevent protein function

Example: GAG --> GTG = glutamic acid --> valine

leads to sickle cell anaemia if both alleles affected

4. An SNP may prevent completion of the protein. STOP codons tell the reading mechanism the process is complete. If this happens during the process, the incomplete fragment is removed. If the revers occurs, reading will continue until another STOP codon adding additional structure thar will interfere withprotein function.

Example: TAT --> TAG = thyrosine --> STOP codon

5. Insertions and deletions can also disrupt protein formation, by changing the reading frame. The transcription process relies on having a start point, so that codons are read from that point (the reading frame). Adding or removing alters the reading frame so that codons are read incorrectly

Example (start)TTCATCGAGTATCGTACA...codes for phe-ile-glu-tyr-arg-thr

suppose the second C is deleted

the reading frame becomes (start)TTCATGAGTATCGTACA.

which reads as phe-met-ser-ile-val- , a very different sequence.

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.

answer: dna

because all cells have genes