It is called growth I know because I clicked on cell division and it was wrong. I am just writing now to make this 20 characters
As the ion channel opens and allows its movement in an energetical direction. Then it redistributes these ions in opposite direction back across the membrane.
The Na channel opens as the membrane is hyperpolarized. The averaged collective response of single channels resembles the time course of the macroscopic current. Macroscopic currents are blocked by Tetrodotoxin (TTX) but not microscopic currents.
Opening and closing of Na channels are concentration dependent. The function of ion channels inorganic ions (like Na, K, Ca or Cl) to rapidly diffuse their electrochemical gradients that is across the lipid bilayer.
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The discordance between the number of nucleic acid bases and the number of amino acids immediately eliminates the possibility of a code of one base per amino acid. In fact, even two nucleotides per amino acid (a doublet code) could not account for 20 amino acids (with four bases and a doublet code, there would only be 16 possible combinations [42 = 16]). Thus, the smallest combination of four bases that could encode all 20 amino acids would be atriplet code. However, a triplet code produces 64 (43 = 64) possible combinations, or codons. Thus, a triplet code introduces the problem of there being more than three times the number of codons than amino acids. Either these "extra" codons produce redundancy, with multiple codons encoding the same amino acid, or there must instead be numerous dead-end codons that are not linked to any amino acid.
Preliminary evidence indicating that the genetic code was indeed a triplet code came from an experiment by Francis Crick and Sydney Brenner (1961). This experiment examined the effect of frameshift mutations on <span>protein synthesis</span>. Frameshift mutations are much more disruptive to the genetic code than simple base substitutions, because they involve a base insertion or deletion, thus changing the number of bases and their positions in a gene. For example, the mutagen proflavine causes frameshift mutations by inserting itself between DNA bases. The presence of proflavine in a DNA molecule thus interferes with the molecule's replication such that the resultant DNA copy has a base inserted or deleted.
Crick and Brenner showed that proflavine-mutated bacteriophages (viruses that infect bacteria) with single-base insertion or deletion mutations did not produce functional copies of the protein encoded by the mutated gene. The production of defective proteins under these circumstances can be attributed to misdirected translation. Mutant proteins with two- or four-nucleotide insertions or deletions were also nonfunctional. However, some mutant strains became functional again when they accumulated a total of three extra nucleotides or when they were missing three nucleotides. This rescue effect provided compelling evidence that the genetic code for one amino acid is indeed a three-base, or triplet, code.
<span>National highway traffic safety administration doing the survey in Basis of this research, He found that the drivers who get more citations are involved more road crashes. These guys are not taking seriously to his life. Road safety is very important for these.</span>
Answer:
c. A chromosomal mutation can change the total number of chromosomes in the cell.
Explanation:
A gene mutation affects a single gene, and replication error is the main cause of gene mutation. A chromosomal mutation affects one part of chromosome or full chromosome. error in meiosis is the main cause of chromosomal mutation. Both mutations are responsible for a change in DNA. A chromosomal mutation leads to the change in total number of chromosomes in the cell.
