answer d
explanation
he use the shadows of the earth to see its round shape
<h2>Intestinal Epithelial Cells (IEC)</h2>
Explanation:
- <em>Polarized intestinal epithelial cells (IEC),</em> as well as the resident microflora, provide a barrier that guards <em>against microbial invasion</em>
- The necessity for the <em>epithelium </em>to maintain an intact barrier between <em>lumen bacteria</em> and the lamina propria is exemplified by the consequences after the barrier function is altered
- Impairment of the barrier function of the <em>intestinal epithelium may be a predominant mechanism in the pathogenesis of inflammatory bowel disease (IBD)</em>
Answer:
Explanation:
In the Hershey and Chase experiment, they aimed to show where the phage DNA went when it exited the protein coat and entered the bacteria. In this scenario, the two student's approach won't work because amino acids (and therefore all proteins) also have nitrogen atoms which ultimately means that the radioactivity would not distinguish between DNA and proteins and the experiment will not provide the correct results.
<span>To prove his Theory of Evolution. After studying the different species of finches he found the Galapagos Islands, Darwin focused on breeding pigeons by selecting specific traits of different individuals (this is mainly a method through which different kinds of dog breeds came about). On the basis of these studies Darwin concluded that natural selection and artificial selection acted roughly in the same way. Darwin's decision to enforce a certain trait represented, in a sense, the selective pressure which is present in a natural environment (the law of the fittest).<span>
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