Answer:
Explanation:
One of the earlier experiments that confirmed DNA and not proteins as genetic material was conducted by Alfred Hershey and Martha Chase
Hershey and Chase experiment showed the genetic material of virus is DNA not protein. Their experiments demonstrated that Phage are composed of DNA and protein, when phage infect bacteria, their DNA enters the host bacterial cell but not protein before infection
Hershey and Chase experiment prove that DNA is the hereditary material.
From chargaff base pairing rule, the ratio of purine to pyrimidine is a cell is 1:1. Since adenine pair with thymine and cytosine pair with quanine, this means the percentage of adenine will equal the percentage of thymine.
%A = %T and %G = %C.
%A + %T + %G + %C =100
If a DNA contains 8% adenine, therefore the percentage of thymine is 8%
8% + 8% + %G +%C = 100%
16% + %G +%C = 100%
%G +%C = 100%-16%
%G +%C = 84% = 84%/2= 42%
Since %G = %C
Then %G = 42%, %C = 42
Virus’s are not considered living organisms because:
1. they cannot reproduce by themselves.
2. are structurally very simple.
3. can only be visualized using an electron microscope.
4. typically are associated with diseases.
Answer:
The correct option is <em>D. Social scripts</em>
Explanation:
A social script can be described as the best actions, manners and behaviours which are to expected to be shown in a particular situation. These manners and behaviours are depicted and shown in the form of a script so that they can be learned. For example, in the question above Tawnie is depicting the best behaviour that a child should show up in a classroom. Hence, this script is said to be a social script.
It is taxis as taxis is movement characterized by light, heat, moisture, or chemicals while kinesis is movement that involves orientation.