Answer:
D. The two students who have two fragments have one restriction site in this region.
Explanation:
The DNA samples from the cheek cells were subjected to digestion with a restriction enzyme. This enzyme is an endonuclease and cuts the DNA at a specific sequence only. This sequence is called a restriction site. If the restriction site is not present in the sample DNA, the restriction enzyme cannot cut it. The presence of one restriction site in the sample DNA would cut it into two DNA fragments.
Similarly, the presence of two restriction sites in each DNA molecule would obtain a total of three DNA fragments per DNA molecule.
Conclusion is the step of the scientific method explains why the results turned out the way it did.
<h3>What are the steps of scientific method?</h3>
There are seven steps of the scientific method which are the following:
1. Ask a question: The first step in the scientific method is asking a question that you want to answer.
2. Perform a research about the given topic.
3. Make your hypothesis. Hypothesis is a statement which may be true or false.
4. Test your hypothesis by conducting an experiment or a series of experiments.
5. Make an observation.
6. Do analysis about the results and draw a conclusion on the basis of given data.
7. Present the findings to the world.
So we can conclude that Conclusion is the step of the scientific method explains why the results turned out the way it did.
Learn more about scientific method here: brainly.com/question/17216882
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Answer:
Hypothesis If the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.
Explanation:
The fir tree can be found in the coniferous forest biome, and the cactus can be found in the desert biome.
Option C.
<h3><u>Explanation:</u></h3>
Both the cactus and fir trees are having modified tree leaves due to the same purpose - saving water.
The fir trees are found in the coniferous forests which are mainly seen in mountains or in the temperate region. Both the regions face very cold climates and frequent snowfalls in every years. This is why there's a lack of water in the surroundings. This is why they need to save water and minimize transpiration.
Whereas the cacti are found in desert or semi arid regions where water is itself very scarce and temperature is either very high or very low. So they have their leaves converted into spines which help to reduce transpiration.
