Energy is necessary to counteract the diffusion of Na + and K + ions across the plasma membrane of a neuron because the ions tend to diffuse across the plasma membrane from an area of high concentration of ions to an area of low concentration of ions, causing an equal distribution of ions outside and inside of the cell ...
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Answer:
Parathyroid hormone is released when dietary calcium levels are low.
Explanation:
Parathyroid hormone is considered to be a vital hormone involved in regulating the calcium levels of the body. The hormone is secreted by parathyroid glands which are located behind thyroid glands in neck region. This hormone regulates the calcium level of the body by putting its action through bones, intestine and kidneys.
In actual there is a negative feedback system in the body through which parathyroid levels are controlled. When calcium levels in the blood get very low, the gland is stimulated to secrete more parathyroid hormone while when calcium is very high in the blood, it prevent the release of parathyroid hormone.
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Arginine
Lysine
Aspartic Acid
Glutamic Acid
Glutamine
Asparagine
Histidine
Serine
Threonine
Tyrosine
Methionine
Alanine
Isoleucine
Leucine
Methionine
Phenylalanine
Valine
Proline
Glycine
Answer:
The correct answer is
(b)-Chromosomes are made up of protein and nucleic acid.
(c)-Genes are located on chromosomes.
(d)Chromosomes are found in the nucleus.
Explanation:
DNA coils around a protein molecule present inside the nucleus to form a compact structure called chromosomes. These histone proteins have a positive charge and it neutralizes the negative charge of the DNA.
By 1940 it was known by scientists that chromosomes are made up of protein and nucleic acids and chromosome carries the genetic material but at that time it was thought that protein part of the chromosome is the genetic material.
Then Hershey and Chase experiment in 1952 proved that DNA is the genetic material. Mendel first discovered that traits pass from one generation to another as separate factors. Later the word factor converted into gene in 1909 by Wilhelm Johannsen.
So by 1950, it was known that Chromosomes are made up of protein and nucleic acid, Genes are located on chromosomes, and Chromosomes are found in the nucleus.
A cell wall is in a plant cell. A cell membrane is in an animal cell.