<u>Answer</u>:
All statements describe advantages of models.
<u>Explanation</u>:
Models are the representative of the real world. A model system can provide information of the reactions going on inside a living system. A model should provide the following advantages which are: it should be easy to culture in lab., it should have a short life cycle, it should be inexpensive to operate, it should be easily genetically manipulated, it should be a representative of the original population, I should provide accurate result which might happen in the original population and it should provide economically important results etc. Model can include an organism or it can be a Computer based simulation.
I think the answer is sample 1
Hope this helps!
Answer:
The correct answer would be D.Alveolar sacs are surrounded by thin capillaries where gases can be exchanged.
Alveoli are tiny sacs which form the site of gas exchange in the lungs.
The features of alveoli which help in gas exchange are:
- They increase the surface area in the lungs thus, more space is available for gas exchange.
- They have very thin walls, as thin as the thickness of a single cell only.
- They are surrounded by a bunch of thin capillaries which exchange gases with alveoli.
Answer:
The correct answer is option C. "pleiotropy".
Explanation:
Pleiotropy is a characteristic that defines a gene that is responsible for the development of multiple traits, which often seem to be unrelated. Sickle-cell disease is an example of a disease caused by the mutation of a pleiotropic gene, resulting in the person developing red levels, blood clots, and strokes. Other example is the disease phenylketonuria, at which the affected person suffers from a mental disorder and reduced hair and skin pigmentation by a single mutation in a single gene on chromosome 12.
