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[生物 Bio] HKDSE Biology Question Review 2020-07-28



HKDSE Biology Question Review 2020-07-28

[隱藏]
1. A hen can eat an adult tapeworm directly where a man cannot digest a tapeworm egg in his stomach. Explain briefly.

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Solution:


The protein structure of a tapeworm entails strong intermolecular hydrogen bonds as a tapeworm carries out locomotion by hydrostatic pressure, so there should require extra external force to carry out additional physical digestion. In fact, a hen will ingest sand where it undergoes grinding food in its stomach.



In human, the tapeworm egg is so small such that physical damage to its protein structure is negligible, then it will overcome the hydrolytic attack by gastric juice and get hatched in intestine substantially.

[ 本帖最後由 AIJ 於 2020-7-28 02:31 AM 編輯 ]

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2. Explain why women dominate sexual selection in humans.



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Solution:


Womb is the only medium to produce human offspring. If direct external cloning exists when technology permits, existence of women will be meaningless since sexual reproduction will entail higher cost than that of non-genital cloning.

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[隱藏]
3. Eugenics will lead to failure of human civilization. Explain briefly.

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Solution:


Eugenics implies meiosis of chromosome of LIMITED variation. If the genes fail by mutation such as cosmic radiations, there will  be no new gene pool to overcome the subsequent defects. Simply put, the body defense functionalities of eugenic offspring will be hopelessly compromised over multiple generations and counting. Finally, all offspring will die by irresistible malignant tumors caused by external environment.

[ 本帖最後由 AIJ 於 2020-7-28 02:47 AM 編輯 ]

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