就考啦！點樣操練dse bio pp先最有果效？（四）
26/03/2025
Q10都翻炒咗一條dse嘅標準題型:
Pollen grain germinates a pollen tube on stigma>
carries male gametes to egg inside the ovule via micropyle>
male gametes fuse with female gametes to undergo fertilization to form a zygote
呢一條都係Dse2017/Q3同埋好多條HKCEE出過，記得要寫清楚啲Event係發生喺邊一個floral structure , 例如germination of Pollen grain係喺Stigma, fertilization係發生喺ovule.
接落嚟，我哋都要睇吓喺dse 2024，有邊啲係dse從來未出過，其實係喺HKAL翻炒嘅呢？
Dse 2024/Q1, nervous control vs hormonal control, 第一條通常係送分㗎嘛，但係今年第一條就考起同學啦，不過如果你讀埋HKAL，就會知道呢一條喺2002/P2/5b已經出過。
Dse2024/Q2 gene mutation (substitution)，其實在Dse2018, 2021, 2022已經出過substitution, 不過喺之前DSE嗰三年出嘅套路都係一模一樣：
change a nucleotide in DnA sequence>
change a codon in mRNA>
code for a different amino acid>
change in shape of protein >lose its original function
而今年嘅問法，都係考同一個概念，不過就轉一轉，同樣係change a nucleotide in DnA sequence，但係點解又唔會lose its original function？
change a nucleotide in DnA sequence>
change a codon in mRNA>
code for the SAME amino acid>
DOES NOT change in shape of protein >lose its original function
喺呢度就考咗genetic code is degenerated 呢個foundation concept. 所以就算轉左粒Nucleotide, 繼而轉咗個codon, 原來係有機會code for the same amino acid. 所以出嚟嘅protein就係同一個。
Dse2024 Q3: 以前只考oxidative phosphorylation 的location是在inner membrane, 今年就考埋個structure 點樣adapt to its function - inner membrane folds to increase surface area to pack more enzymes/electron carriers for oxidative phosphorylation.
呢條在HKAL 2005/P2/3b已經出過。
而answers involves the brief processes in respiration 都可以參考HKAL 2012/P2/3a同HKAL 2003/P2/6.
值得留意Dse2024考左inhibit aerobic respiration 會shift去anaerobic respiration, 其實就前一年Dse2023/Q10c都考左呢個concept, 不過2023考的是human, 2024考既係plant, 所以分別只係anaerobic respiration 既products 會唔同，分別係lactic acid同ethanol and carbon dioxide. 同埋Dse2024個respiration processes會考得detail 一些。
我是Miss Wong, 專科生物補習老師。歡迎查詢及試堂，包括Dse biology, igcse biology, IB biology, GCE biology, 有小班及少量單對單，親自任教，名額有限。學生成績超班、大有進步才是重點全部有真見證，是bio補習不二之選。
