The different layers of the earth have different densities, and the seismic waves produced during an earthquake travel at different speeds through these layers. By measuring the different speeds, we can clarify the presence of layers within the earth, as well as their densities. Waves will travel faster through thinner layers, and slower through more dense layers.
Question - In a paternity testing case, a child's DNA was collected to see if it matched both parents' DNA. Which type of genetic material can be used for the DNA fingerprinting?
Answer - gel electrophoresis
Why - It is used to "separate molecules/DNA according to their size and electrical charge using an electric current passed through a gel containing the samples".
The hormone that increases osteoclastic (bone break down) activity to release more calcium ions into the bloodstream is Parathyroid Hormone.
- Low level of Calcium in the blood stream stimulates the release of Parathyroid Hormone from Parathyroid gland.
- This hormone in turn stimulates bone cells to release the stored Calcium thereby increasing Calcium concentration.
- Parathyroid glands are located on the back side of Thyroid gland.
- These glands are responsible for the regulation of Calcium and Phosphorus.
- Calcium levels in blood and body should be equal and Calcium perform various functions of body such as Muscle contraction, Blood clotting, Bone rigidity.
- Hence any disturbance in the harmony of Calcium between blood and bone triggers release of Parathyroid Hormone from the Parathyroid gland.
Therefore from the above points we can conclude that Para Thyroid Hormone increases osteoclastic activity.
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Lipids are necessary in all cell membranes and all organisms have cell membranes.