Which of the following statements is true?
B. A habitat represents all the biotic factors in an ecosystem.
Answer: For many people, the idea of a “garbage patch” conjures up images of an island of trash floating on the ocean. In reality, these patches are almost entirely made up of tiny bits of plastic, called microplastics.
Explanation:
Antibiotics are small molecules that are used to treat diseases that are caused by organisms
Vaccines are used to prevent infection to a particular disease.
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Answer: D) The number of atoms of each element of the protein
Explanation: A chemical formula of a protein or any compound is the representation of the number of atoms of each element present in that protein or compound using chemical symbols and numbers. A symbol of an element consists of either the initial letter or the initial letter with one small letter from its name. Examples: symbol of carbon atom is C and the symbol of calcium atom is Ca. In writing chemical formula of a compound, the number of atoms of an element present in the compound is usually written as a subscript to the symbol of that element. Example: The chemical formula of glucose is C6H12O6, this means that there are six carbon atoms, twelve hydrogen atoms and six oxygen atoms in one molecule of glucose.
Homologous chromosomes pair up and exchange segments of DNA.
Option A
<h3><u>Explanation:</u></h3>
Crossing over is an event of Prophase 1 of meiosis 1. It occurs in the zygotene phase of prophase 1. Here the homologous chromosome pairs get very close together and gets packed within protein coat. The enzymes randomly cut the DNA segments from both chromosomes at same loci and exchange them with each other. This results in the exchange of genes between the two chromosomes. This is how the variation comes to place between offsprings of the same individuals. The crossing over results to form X shaped intersections between homologous pair of chromosomes which is called as chaismata. This phase occurs in pachytene phase and is visible in diplotene phase when the protein coat dissolves.
