2018 DSE Biology 生物 討論區

medic ching?
Syllabus有，但一路都冇出

2007 AL Paper 1A

嗰concept同呢條有啲似

both of them are possible

thyroxine paper 1 syllabus都有?
唔係e1 only?

btw warm moist air條問題答案係咩
唔知有咩答

其實唔係咁架

antibody有分monoclonal同polyclonal 兩者都係由lymphocyte (plasma cell)整 都係可以bind to SAME antigen 所以都係可以去用黎test for specific protein (most antigen is protein)

分別在於一粒antigen molecule其實好大 而每粒lymphocyte都只係認到某一部分既antigen 佢整出黎既antibody自然都係認返果一特定部分既antigen

例如
lymohocyte A認到antigen part A 會整antibody A
lymohocyte B認到antigen part B 會整antibody B

monoclonal antibody就係指全部antibody都係由same clone既lymphocyte整出黎 用返個例子 即係lymphocyte A做mitotic cell division 所以有好多好多粒lymohocyte A既clones整好多好多monoclonal antibody A

polyclonal antibody其實係mixture of antibody, 定義係antibody produced from different clones of lymohocyte 用返個例子 polyclonal antibody可以係monoclomal antibody A 同 monoclonal antibody B溝埋一齊 produced from clones of lymohocyte A and clones of lymohocytes B (所以係different clones)

不過dse應該唔需要學到monoclonal同polyclonal既分別 淨係寫antibody就得

考前一日就唔好睇out c 野啦
睇 marking 同以前錯咩算

marking話個short-lived instruction係RNA RNA係translation之後就會break down

Yes

一理通百理明 唔該巴打

290mmol solute in filtrate + 1L water = 290mmol/L concentration

in proximal convoluted tubules: solute absorbed, increase water potential in filtrate, so water is also absorbed by osmosis

the answer said "absorb in same proportion", which means, for example, 145mmol solute absorbed will lead to absorptiom of 0.5L water, so remaining solute and water in filtrate is 145mmol and 0.5L respectively, and the solute concentration is still 290mmol/L

繼續post elective 1
呢條主要考你識唔識引用source，呢樣能力係做LQ(不論core定elective)必需的。

2013 AL Paper 1C

yes

啲題目好有回憶
考生們加油

依家E2洗唔洗考 sewage treatment ?

有教

點解係A

我都有教 但係syllabus好似無講到

cardiovascular system係咪無牽汲咩receptor?
除左stretch receptor以外

carotid body有chemoreceptor

依個好似係關respiratory center?
btw頭先打錯係cardiovascular center