Answer is (E) : Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins.
Let me explain you why. Hershey and Chase conducted their experiment to show what is the genetic material that passes from one generation to another generation. Is it protein or DNA? For explaining this, they allowed the virus to grow in the presence of two different radio active elements.
In one set they grew viruses in the presence of P-32 radio-active element
In another set they grew viruses in the presence of S-35 radio active element.
The reason why they choose these two radio-active element was, phosphorus is present in DNA but not in proteins and similarly sulphur is found in proteins but not DNA.
These viruses were allowed to infect bacteria and the later was observed to be radio-actively labelled with P-32 but not S-35. This clearly showed that DNA is the genetic material which was passed from virus to bacteria.
Now if you choose Nitrogen for labeling, it won't help you in getting any conclusion since nitrogen is present in both proteins and DNA.
There are many body movement signs that the sender wants the conversation to end. One of the sign is tapping a finger or pencil on something. This indicates that the sender is in a hurry and wants the conversation to end. Secondly is the direction the feet are facing. If the sender's feet face away from you or towards the door, then the sender is bored and wants the conversation to end.
If we have a wild-type allele of AA, and Aa for the mutant allele, the possible genotype of the off-springs can be determined using the Punnett Square.
__| A | A |
A | AA | AA |
a | Aa | Aa |
Thus, all the off-springs will show the trait for the allele.
A. Both strands of the DNA molecule act as templates
Answer:
D
Explanation:
The cleaner shrimp gets food while the eel gets the parasites off