2018 DSE Biology 生物 討論區

真，有用。

條cleft係同一個名

呀肥巴唔鼓勵人夜瞓，自己又唔早啲瞓

係唔鼓勵後日要考試嘅人夜訓，所以我先唔答DSE問題
我三月考完試，依家放假，慣咗夜訓
你要早啲訓啊

試前睡眠良方

一除michealis equation之後變左lineweaver burk plot條式，可以寫成y=mx+c format，所以係直線
1/V = y
1/[S] = x
slope= m= Km/Vmax

nucleotide入面aromatic ring既absorption peak係260nm, spectrometer入面有light source放260nm既UV light (visible light既wavelength好似係300-700nm)。UV light穿過sample果陣有部分會比sample吸左，之後spectrophotometer會detect剩餘無吸到既光去計返absorbance。
要計sample concentration就要用known concentration既standard擺落部spectrophotometer度absorbance之後plot standard curve (absorbance against concentration) 再用standard curve搵返你unknown sample既concentration

不過呢d都唔係dse野

巴打有心

你張圖寫既野只係寫左ADP多左會令krebs cycle快左既事實

如果無記錯的話ADP係activator of some enzymes in the Krebs cycle 所以會快左

因為多ADP = 少ATP = 唔夠energy，咁cell自然會想加快krebs cycle 整多d ATP

DNA CD230/CD260有absorption spectrum(好似係
對著standard curve一野轟落去就得

lineweaver burk plot 同 M-M Equation 係簡單數學關係
你睇下點derive出黎就會明

聽日上戰場既同學要加油

唔該晒巴打
另外仲有 唔係好明E4嘅monoclonal antibodies係咩嚟 即係整咗一堆同樣嘅antibodies出嚟 就可以用喺sensitive test?

monoclonal antibody係講緊來自同一個lymphocyte做的antibody
antibody的structure完全相同，所以可以用黎screen特定protein

明白了 唔該你

可唔可以解下2016年paper1 8b嘅所有分題 題目又睇唔明佢問乜 連marking都睇完都唔知佢想問乜
另外downsyndrome係separation of homologous chromosomes 到fail 定separation of sister chromatids 到fail

(a) your answer should write "bile" instead of "bile salts".
(c) marking scheme should write "bile salt solution" instead of bile salts.

呢條係past paper題目定你自己諗?
出得有少少奇怪

喺低溫環境嗰陣thyroid會secret thyroxine去increase metabolic rate令到個身體熱番
索warm moist air可以增加dissolved oxygen入血 比多啲O2啲cells做respiration去produce more heat?

不知為不知，是知也。你首先要搵出自己唔明啲乜先，咁先有進步，好過人哋spoon-feed你。知道自己唔明啲咩都係好重要。
Down syndrome果度，事實上兩個situations都係possible

warm air prevent spasm of the trachea ?
however moist air should not improve oxygen diffusion
dse 咁深考thyroxine 架咩

真係要答嘅話，我會話“reduce evaporation of the (water in) water film” instead of “more water dissolved in water film”. 因為我唔肯定係咪真係會dissolved多啲。

呢題我鳩答 唔係好識
有冇答案