Answer:
In the semi-conservative method of DNA replication, each of the strands of the double helix acts as a template for replication.
Explanation:
Semi-conservative DNA Replication:
- Semi-conservative DNA replication produces two daughter helices from the original parent helix. One strand of the daughter helix is form the original template while the other is newly synthesized.
- This means that one strand will have the base sequence identical to the parent, while the other will be complementary to the template.
- This model was experimentally confirmed by an experiment conducted in 1958 by Meselson and Stahl. They used radioactive isotope of nitrogen i.e. N-14 or N-15. DNA molecules made with N-15 were allowed to replicate in the presence of N-14.
- After first replication, DNA molecules contained both N-15 and N-14 isotopes, disproving the conservative model that stated that the new helices are completely identical to the template.
- The second replication yielded only N-14 which disproved the dispersive model that the new helices are a combination of both the template and new strands.
* The attached image compares the three proposed models for DNA replication.
<h3><u>Answer;</u></h3>
The polysaccharide is <u><em>Hyaluronic acid</em></u>
<h3><u>Explanation;</u></h3>
- <u><em>Hyaluronic acid is a natural polysaccharide</em></u> which is in the class of glycosaminoglycans that is mostly found in <em><u>neural, connective and epithelial tissues in human body. </u></em>
- <em><u>Hyaluronic acid is made up repeating units of glucuronic acid and N-acetylglucosamine</u></em> that are<em><u> joined by alternating β- 1,4 and β- 1,3 glycosidic bonds. </u></em>
- It is a <em><u>linear polysaccharide and is the only glycosaminoglycan </u></em>that lacks sulfate atoms in its structure.
1. all of them
2. cork and wax
3. iron, lead, and aluminum
4. none of them
Answer:
For the object of to be considered alive , it must have DNA and all the characteristics of living things.
Explanation:
If one is to determine whether the object is alive or not the object should possess all the properties of living things. firstly, it should have the genetic material the DNA without which the cell can't be alive or the nucleus in case of PROKARYOTES. it should have the ability to reproduce, move , to grow and to excrete without which it would not be considered alive.