Physical and function unit
Answer:
Microvilli are lined with blood vessels as well as lymphatic vessels.
Explanation:
The small intestine is one of the most important part of the body. This is the main site of digestion and absorption of food in the body. The three main parts of small intestine - dedenum, jejenum and ileum.
The small intestine has both villi and microvilli in its structure. These villi helps in increase in the surface area for absorption. Microvilli are lined with the blood vessels only and not with the lymphatic vessel. This vessels are directly connected to the hepatic portal system.
Thus, the correct answer is option (C).
Answer:
<em>The correct option is A. mitospore</em>
Explanation:
A mitospore can be described as a haploid or diploid spore. Generally, a spore is formed by meiosis but under certain conditions it can form by the process of mitosis and is known as mitospore.
When spores are formed by sexual methods, meiosis occurs. When they are formed by asexual methods, mitosis occurs. Asexually, there are different ways by which mitospores form by mitosis.
Answer:
A. pH
Explanation:
Denaturation of proteins is a protein whereby the protein molecule loses its primary structure and ultimately its physical functioning as a result of factors including pH, temperature or concentration of chemicals. Based on this definition, it is visible that denaturation of proteins can be caused by these three factors: pH, chemical and temperature.
However, in this case of PEPSIN enzyme, which is a proteinous molecule produced in the stomach of humans and functions in breaking down proteins, its denaturation occurs as it moves along the digestive tract to the intestines. This is as a result of the changes in pH in the digestive tract.
The pH of the stomach where pepsin is produced is acidic i.e. <3.0. However, as one moves towards the intestine, the pH increases, which is unfavorable or considered harsh for the pepsin enzyme. Hence, it gets denatured.
