Answer:
D. How deep the lake is
Explanation:
The benthic zone is the zone that is at the bottom of the lakes. This means that the characteristics of this zone and weather photosynthesis will be a possibility depend on the depth of the lake. If the lake is deep, then the photosynthesis will not be possible in this zone as the sunlight will not be able to reach it, thus this zone will be very poor in organisms. On the other hand, if the lake is shallow and the water is clear, then the sunlight will be able to reach the benthic zone, thus providing the conditions for the process of photosynthesis, and it will be very rich in organisms.
Answer:
E. Erwin Chargaff >> Discovered that there were equal amounts of the nitrogen bases A T and C G in a human body cell; concluded that A paired with T and C paired with G
B. Hershey and Chase>> Did experiments with viruses to determine that DNA, not protein, is the genetic material of a cell
A. Frederick Griffith>> Did experiments with S and R strain pneumonia bacteria to determine that DNA is the genetic material of a cell
C. Rosalind Franklin >> Took x-ray crystallography images of a DNA molecule.
Explanation:
Chargaff rules helped to determine the double helix structure of the Deoxyribonucleic acid (DNA), i.e., the genetic material of prokaryotic and eukaryotic organisms. Chargaff indicated that DNA from any species contains a 1:1 ratio of purine bases (Adenine and Guanine) and pyrimidine bases (Cytosine and Thymine). Hershey and Chase provided evidence that the DNA, instead of protein, is the hereditary material. Hershey and Chase used radioactive phosphorus-32 in order to label the DNA of specific bacteriophages (T2), and they discovered that the DNA was responsible to generate progeny inside infected bacteria (i.e., DNA was hereditary material). Frederick Griffith observed that DNA molecule was the transforming factor that could be transferred to innocuous <em>Streptococcus pneumoniae</em> bacteria in order to convert them into deadly bacteria. Finally, Rosalind Franklin obtained the first X-ray image that showed the diffraction pattern of a crystallized DNA molecule, which was used by Watson and Crick to propose that DNA had a double helix structure.
One would expect to find silver carp DNA at Chicago site 2 if silver carp DNA is found at Chicago site 1 and North Shore sites 1 and 2 because they are within the same location and body of water and because silver carp are invasive species.
<h3>What is gel electrophoresis?</h3>
Gel electrophoresis is a analytical technique that is used in the of separation of the macromolecules such as DNA and their fragments based on their size and charge.
The DNA of silver carp was analyzed using gel electrophoresis.
The results of the gel electrophoresis of the silver carp DNA is as shown in the attached image.
Considering the results;
The gel bands of North site 1 and Chicago site 1 matched the positive control indicating that silver cap DNA was present in those site.
However there was no match for North site 2 and Chicago Site 2.
If you find silver carp DNA at Chicago site 1 and North Shore sites 1 and 2, then it is expected that silver carp DNA will be found at Chicago site 2 since they are found in the same location and because silver carps are invasive species.
In conclusion, the matching DNA bands indicates presence of Silver carp DNA at those sites.
Learn more about gel electrophoresis at: brainly.com/question/6885687
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Answer:
phototropism
Explanation:
The student was investigating phototropism.
The student wanted to know the response of the roots to light, that is why he exposed them to light.
Roots naturally exhibit two types of tropisms.
The first is gravitropism whereby they tend to grow downwards.
The second is hydrotropism whereby they grow towards the direction of water.
In the above experiment, no water was provided, the roots grew away from the light source but not specifically downwards.
