Answer:
The radioactive isotopes of Potassium-40 generally observed to decay to argon-40 and calcium 40, also called daughter isotopes. The problem arises with the calcium 40 radioisotopes which cannot be used for age determination due to its excessive presence.
Explanation:
The radioactive isotopes Potassium 40 decays to argon 40 helps in determining age of fossils and rocks mainly due to the fact that extreme heat causes radioactive potassium to decay to noble argon-40 gas. The rate of decay is attributed to its half life period which in turns help in finding the relative age of fossils or rocks. But, problem occurs when it decays to calcium 40, as because calcium forms large part of many minerals including bone.
Answer:
Advances in DNA technology have allowed for treatments such as gene therapy in the medical field. Nowadays, there are tools like the CRIPSR-Cas9 - harnessed from bacteria's immune system- that can nip a ‘bad’ region of DNA, which is responsible for disease, and replace it with a proper functioning bit. This is how genetic disorders are going to be addressed in the near future in mainstream medical facilities.
Recombinant DNA technology is being used to create clones of transgenic organisms that produce products of significance in the medical fields. An example is incorporating the insulin gene in bacteria genome. These clones of modified bacteria colonies secrete insulin protein that is purified and injected in diabetic persons to lower their sugar level to normal.
Answer;
-Bone tissue becoming stronger.
The mechanical stress applied to bones during moderate physical exercise leads to bone tissue becoming stronger.
Explanation;
-Bones and muscles both become stronger when muscles push and tug against bones during physical activity.Swimming and bicycling are not weight-bearing activities, so they do not directly help build bones. But swimming and bicycling do help build strong muscles, and having strong muscles helps build strong bones.
-Weight-bearing physical activity causes new bone tissue to form, and this makes bones stronger. This kind of physical activity also makes muscles stronger. Bones and muscles both become stronger when muscles push and tug against bones during physical activity.
3.Even though there are some dna traces in the mitochondria,it’s won’t really be tested for gcse and mostly the DNAs are found in the nucleus of the cell.
