[DSE生物2018］Bio討論區

我都想問 書無講 但marking見過幾次

點知一個題嘅答案
Btw覺得16年好難

A寫左thylakoid only...點知佢碌野係隊緊係membrane度？ 定寫親thylakoid都要跟membrane?

因為d antibody 會導致 hemolysis

好似冇學過咁

答thylakoid有分

唔係

Because the foot contained the hereditary information i.e. DNA (within nucleus), but not the stalk.
That means "something" other than DNA is in the stalk which contributes to the mixed morphology.
Also, that "something" is short-lived. It is therefore most likely RNA.

Why is the RNA short-lived?

教genetics果時應該有？codominant
A型血的人，輸B型血會有 anti-B antibody出現，因為係foreign antigen (未輸血前冇，要exposure to果隻antigen先會有primary response)
O型血會against哂A同B型血

可以short form

係啊，所以唔係out syl
其實應該係，A型血嘅人，before receiving blood transfusion，血液入面已經有antibody B。

wiki

但如果以dse程度去理解，好似解釋唔到點解未接觸過B antigen就自動會有anti B antibody﹐除左係placenta接觸過少少媽媽的血 (但如果佢係O型，又解唔通)

wiki
其實我諗short-lived都唔係重點嚟嘅，你知佢outside nucleus都估到
Specifically答mRNA都應該有分，tRNA就我個人覺得唔算"derived from the foot of species 1"，but I am not sure whether tRNA is accepted

DSE好似唔要求你知點解，當fact咁就ok

記*



2015Q4c冇叫你解anti A, anti B點嚟
You only need to say that they are present.

我擺錯左重點 好thank you

mRNA的確有分, 啱啱搵到
順便補返thylakoid

thanks

Anti-A, Anti-B係naturally occuring antibodies，與生俱來已經有，唔需要接觸A/B antigen身體自己都會製造出黎

group A: Anti-B
group B: Anti-A
group O: Anti-A, Anti-B
group AB: No anti-A & anti-B (唔係no antibody)

仲有一個星期

Bio 食屎啦
咁長點温

係多嘢讀架
臨急抱佛腳冇好結果

dse有邊科少野讀