The property of DNA which causes it to migrate to the positive pole of the electrophoresis apparatus is B. the negative charge of the DNA.
It acts just like a magnet - positive and negative forces attract.
Answer:
<em>The correct option is D) homologous structures</em>
Explanation:
In evolutionary studies, a homologous structure can be described s a similar structure which is present in different species. This is because these spices might have a common ancestor in the past. For example, the forelimbs of humans and bat. They perform different functions but their structure is similar. They are also derived from the same embryonic origin. These similarities show that the bats and humans might have shared a common ancestor in the past.
I think it would be Carbohydrates.
<span>The most common type is simple columnar epithelial cells. These cells help the stomach resist degradation by the lumen during digestion. In addition, these cells secrete substances like mucous, HCl, and pepsinogen. All these secretions are necessary for proper digestion to take place.</span>
Answer:
1. option B
2. option A
3. option D
Explanation:
1. Which of these studies is an experimental study?
Yes, you got it right, it is study 2. Study 1 and 3 are just observational studies, where researchers collect and interpret data based on what they have seen, heard or observed. But for the experimental design, there is a manipulation on the part of the researchers where he grouped them and administered treatments.
2. Study 1 employs a retrospective design.
You also got that part right, Study 1 actually employed the retrospective design by sampling individuals and then collecting information about their past which in this case is asking questions about the participant's dietary and exercise habits between ages 15 and the present and also their medical records.
3. Study 3 employs a prospective design
You also got this right. Study 3 actually employed the prospective design by sampling individuals and follow them over time and data about them is collected as their characteristics or situations changes and in this context, they observed even after a change by sleeping more than 8 hours per night, students still did not seem to experience additional health benefits.