1. What is the relationship between chromosomes and DNA? The chromosome is a molecule formed by a chain of DNA associated with proteins. Together, they form a group of molecules directly responsible for heredity.
2. What is heredity? It is the biological process where the genes present in a DNA are transmitted by parents to their children, through the division of gametes. These genes carry the codes that form the genotypic and phenotypic characteristics, which allows a similarity between parents and children to occur.
3. What is the role of proteins associated with the DNA molecule that makes up the gene? Proteins are responsible for keeping the DNA line tightly compressed, maintaining the chromosome structure. In addition, they control the activities of the genes present in this DNA molecule, being essential in maintaining heredity.
4. How do chromosomes participate in gene transmission? As mentioned above, genes are part of DNA and DNA is the molecule that makes up chromosomes, in this case, chromosomes are molecules loaded with genes. In the human body, cells have 46 pairs of chromosomes, with the exception of gametes that have half that number. During the reproductive process, the gametes (reproductive cells) divide and produce a new being. The mother's gametes unite with the father's gametes to form a new being. Each gamete has 23 chromosomes, which contain the genes responsible for transmitting the characteristics.
The purpose of saliva serves in digestion is to breaks down complex carbohydrates. The correct option is (A).
<h3>What is saliva?</h3>
Saliva is a transparent liquid secreted by glands present in the mouth. Saliva is an important secretion for the digestion of food in the mouth.
It is made up of water and many digestive enzymes are present in the saliva, which help in digestion of complex carbohydrate like starch.
Thus, the correct option is A) breaks down complex carbohydrates.
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The main process of preliminary treatment is the removal of coarse solids and other large materials found in raw wastewater.
Explanation:
The preliminary treatment is used to protect operation of wastewater treatment plants. This is done by removing from wastewater any things that damage pumps, or interfere with subsequent treatment process.
The treatment process include coarse screening, grit removal, and used to remove excess amount of oils and greases.
Wastewater screening is the first operation used at wastewater treatment plants. In this process the object such as rags, paper, plastics and metals are removed to prevent damage and clogging of downstream equipment, piping. The modern treatments use both coarse screens and fine screens.
