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.
<span>When you talk about growth, it refers to
development either in size, state or ability, the capacity. Growth in living
organisms are resulted from acquiring nutrients, being able to function in
adaptation, irritability, reproduction and excretion. On contrary, these functions
are absent in nonliving things. When you say growth in nonliving things it’s
either by addition of matter or magnitude. The process is called accretion but
this doesn’t mean maturation or aging in living organisms. Maybe rusting or
oxidation is caused by the chemical change, toxification but not growth just chemical
reaction. </span>
Answer:
I think that birds have different bill lengths because of their habitats and their diet. Also natural selection and evolution has also played a factor due to the fact that birds have not always looked the way that they do now, for example the Archaeopteryx a bird that lived around the time of the dinosaurs had a shorter and more powerful bill to grind insects and small mammals
Explanation:
Biotic refers to the living factors and abiotic refers to the nonliving factors.
