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Nikitich [7]
2 years ago
7

How many chromosomes are present in the cell before the start of meiosis?.

Biology
1 answer:
Rudiy272 years ago
3 0

Answer: 46

Explanation: 46 chromosomes are present in the cell before the start of meiosis.

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The use of which material can substitute for copper and reduce copper mine production?
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Answer:

Glass

Explanation:

Copper is a good conductor of electricity and this is why it is used in electrical equipment to transmit electrons with the least resistance. Cable conductors are made of copper and used to transmit data. Copper is now being replaced by optic fiber that is made of glass. Instead of using electrons, fiber optic transmits data using photons – which transmits more data rate than copper.

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3 years ago
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Derived from a 6 membered ring. Contains Cytosine, Thymine, and Uracil.
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b. Nucleotides  

Explanation:

Nucleic acids are examples of structures formed from nucleotides. And in relation to the composition of DNA, we have the formation of the largest cellular macromolecule, all formed by nucleotides.

The nucleotide is a group formed by the association of 3 molecules - a nitrogen base, a phosphate group and a pentose glycide. Thus, we may have variations within these ligands, such as: in DNA we have the presence of pentose deoxyribose, while in RNA we have the presence of pentose ribose.

The nucleotides have differences in relation to its nitrogen base, which can be purine or pyrimidine. Purine bases vary in Adenine and Guanine, while pyrimidine bases are classified in Thymine, Uracil and Cytosine. Purine and pyrimidine bases are complementary and each have specific binders. Thus, we have that the purine base Adenina, binds with the pyrimidine bases Timina and Uracila, while the base Guanina binds exclusively to Cytosine and vice versa.

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The beginning of the menstrual function is known as
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What differences between physical and chemical barriers​
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Mechanical barriers — which include the skin , mucous membranes , and fluids such as tears and urine — physically block pathogens from entering the body. Chemical barriers — such as enzymes in sweat , saliva , and semen — kill pathogens on body surfaces.

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What organelles are surrounded by double membrane?
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