Amino acids are the building blocks of proteins. There are 20 of them in existence. For this item, we are to identify the number of different proteins that can be formed.
In the first position in the sequence, we can have 20 amino acids. Then, because one of which was already used for the first position, 19 amino acids can still be written in the second place. This goes on, and the number of proteins can be calculated as follow,
number of proteins = 20 x 19 x 18 x 17 x 16 x 15
number of proteins = 27,907,200
<em>ANSWER: 27, 907, 200 proteins</em>
Phosphate head (hydrophilic)
Viruses are considered to be non-living pathogens due to their lack of metabolic processes. Therefore, option (C) is correct.
<h3>What is a virus?</h3>
Viruses are complex assemblages of molecules that include proteins, nucleic acids, lipids, and carbohydrates; but, on their own, they are unable to perform any function and must first infect a living cell in order to become active. There would be no possibility of viral reproduction if cells did not exist. Consequently, viruses do not qualify as living beings.
Viruses are not alive because they do not have any of the essential components that are present in living beings. These components include cytoplasm and organelles. They are unable to carry out the duties of the cell such as metabolism and homeostasis.
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The sperm start travels in the seminiferous tubules of the testes where spermatozoa are born, and then transport to the epididymis which sperm passes to the vas deferens and it ended at the utero-tubal junction where egg fertilizes in the fallopian tubes.