香港寵物小精靈村落 論壇

標題: biology multiple choice [打印本頁]

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作者: 小霞的fans    時間: 12/2/2010 04:22 PM
標題: biology multiple choice
1.After drinking a lot of salty soap,a healthy person will produce

A.a small voume of urine with high concentration of salt
B.a small voume of urine with low  concentration of salt
C.a large voume of urine with high concentration of salt
D.a large voume of urine with low  concentration of salt

我知一定係high concentration .. A或者C係岩..
但係個volume係small 定 large呢~? 書寫more urine with a high concentration of salt is produced. 咁應該係C !?

2.which of the following structure of mammalian skin is not involved in temperature regulation?

A.oil glands
B.nerve endings
C.erector muscles
D.blood capillaries

貌似4個都會= = ??
係唔係D ? 因為係arterioles constrict或者dilate..
唔關blood capillaries事 .. ? 謝謝..

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作者: lawkanok    時間: 12/2/2010 06:16 PM
係large volume同high concentration,好似同water potential有關......
blood capillaries....EAA好似唔受佢玩係temperature regulation lu

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作者: Royal    時間: 12/2/2010 07:22 PM


1.After drinking a lot of salty soap,a healthy person will produce

A.a small voume of urine with high concentration of salt
B.a small voume of urine with low  concentration of salt
C.a large voume of urine with high concentration of salt
D.a large voume of urine with low  concentration of salt

係salty soap定salty soup呀??
應該係CE level吧? 如果係excess intake of salt
身體為左放走多d鹽, 就唔會去reabsorb返d鹽(mechanism連AL都out左)
然後因為d鹽仲o係度, 咁d水亦都會留返低 (water potential既問題)
所以答案應該係C. 綠紅藍果SET CE書亦都有講過

我當年記呢個concept都記得好唔舒服
始終kidney有好多既function都係關hormone事
但係CE bio對hormone既介紹又太少
都係果句, 記左佢算

2.which of the following structure of mammalian skin is not involved in temperature regulation?

A.oil glands
B.nerve endings
C.erector muscles
D.blood capillaries

我都估係D, 因為wall of capillaries係唔識contract/relax

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作者: 鴨    時間: 12/2/2010 11:14 PM
第一題是C沒錯
雖然因為飲用大量高鹽度的液體讓身體water potential下降
但是由於同時攝取大量水份
故在reabsorption時是不會reabsorb大量水的
不過在這所涉及的有關乎大量的receptor問題
CE不用考究太多

第2題不是oil glands ?
參與temperature regulation的是sweat gland和subcutaneous fat不是oil gland吧
blood capillaries是有參與
因為它負責讓血液流經表面來散熱的

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作者: 小霞的fans    時間: 14/2/2010 04:49 PM
果本JOINT US SOLUTION寫第1題係A .. 第2題係D
唔通佢錯!?

另外仲有題,,我最弱係肌肉果科=.=
我無從入手=.=

                               
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作者: 拉麵仔    時間: 14/2/2010 07:55 PM
提示: 作者被禁止或刪除 內容自動屏蔽

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作者: 小霞的fans    時間: 15/2/2010 12:48 AM

屈
伸
伸

這圖就是看那個肌肉變粗了
小腿肌肉我就會背位置(前二後三)
大腿就相反

P是biceps,使下肢屈曲所以一定收縮
而大小腿開始變直即是triceps收縮
所以我估B
另外我需要這題目的年份
拉麵仔 發表於 13/2/2010 11:55 PM

                               
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呢題我都係撞B..
係1993年的,,但係答案係D..
我覺得好怪,,P同Q點可能一齊CONTRACT...
但係會考答案同JOINT US 都係寫D...

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作者: unlock-YM    時間: 15/2/2010 03:34 AM

呢題我都係撞B..
係1993年的,,但係答案係D..
我覺得好怪,,P同Q點可能一齊CONTRACT...
但係會考答案同JOINT US 都係寫D...
小霞的fans 發表於 15/2/2010 12:48 AM

                               
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先唔好理佢係一二三四定五頭肌。
你睇幅圖加少少聯想就知係Q,S同T contract，當年我乜野muscle理論都冇記就去考CE Bio，呢類題目都係靠睇圖。

T contract令本身短左 => 兩舊骨距離細左。
S係連住最下面條骨尖端，contract時會拉直隻腳。
Q係連住最中間條骨尖端，contract時會拉直隻腳。

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作者: 小霞的fans    時間: 6/3/2010 04:03 PM
8# unlock-YM

謝謝解答,,我明左
我想問多1條CHEM既問題..

2CrO4^2(aq)+2H^+(aq)  => Cr2O7^2-(aq)+H2O(l)

which of the following statement concerning the above reaction is correct?
A.the solution changes from yellow to orange
B.it is a redox reaction
C.H+ (aq) ions are oxidized
D.CrO4^2 (aq)ions act as an oxidizing agent

我知A同D都唔岩 . 但係B同C 就唔係太肯定..
C? H+ gain oxygen atom 變左H2O 即係佢oxidize 左 ??

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作者: unlock-YM    時間: 6/3/2010 04:21 PM

8# unlock-YM  

謝謝解答,,我明左
我想問多1條CHEM既問題..

2CrO4^2(aq)+2H^+(aq)  => Cr2O7^2-(aq)+H2O(l)

which of the following statement concerning the above reaction is correct?
A.the solut ...
小霞的fans 發表於 6/3/2010 04:03 PM

                               
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A.

O.N. of Cr in L.H.S. = -2+8 = +6
O.N. of Cr in R.H.S. = (-2+14)/2 = +6
O.N. of H in both sides = +1
=> B,C,D are wrong.

[CrO4]2- is yellow while [Cr2O7]2- is orange. => A.

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作者: 小霞的fans    時間: 6/3/2010 07:58 PM

A.

O.N. of Cr in L.H.S. = -2+8 = +6
O.N. of Cr in R.H.S. = (-2+14)/2 = +6
O.N. of H in both sides = +1
=> B,C,D are wrong.

[CrO4]2- is yellow while [Cr2O7]2- is orange. => A.
unlock-YM 發表於 5/3/2010 08:21 PM

                               
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謝謝你^^唔介意我問多一題><""

Element X forms two oxides,XO2and XO3. if 1 mole of XO2contains n atoms,3 moles of XO3would contain

A.3n atoms
B.4n atoms
C.5n atoms
D.6n atoms

佢地既mole數唔一樣!??

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作者: unlock-YM    時間: 6/3/2010 08:21 PM

謝謝你^^唔介意我問多一題>
小霞的fans 發表於 6/3/2010 07:58 PM

                               
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n x 4/3 x 3 = 4n atoms?

Mole數係唔一樣...

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作者: 小霞的fans    時間: 7/3/2010 12:07 AM

n x 4/3 x 3 = 4n atoms?

Mole數係唔一樣...
unlock-YM 發表於 6/3/2010 12:21 AM

                               
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係4n呀..

但係x4/3 x3 呢舊野點黎架@@?

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作者: unlock-YM    時間: 7/3/2010 12:12 AM

係4n呀..

但係x4/3 x3 呢舊野點黎架@@?
小霞的fans 發表於 7/3/2010 12:07 AM

                               
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先當大家都係1 mole，咁XO3的atom數就係XO2的4/3。
佢話3 moles，咁再乘三就係答案。

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作者: 小霞的fans    時間: 7/3/2010 02:40 PM

先當大家都係1 mole，咁XO3的atom數就係XO2的4/3。
佢話3 moles，咁再乘三就係答案。
unlock-YM 發表於 6/3/2010 04:12 AM

                               
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3是因為XO3有3個Atoms嗎??4是XO4有4粒atoms嗎??

又發現問題>< ""

one mole of sulphur atoms has a mass twice that of one mole of oxygen atoms.which of the following statement(s) is/are correct ?

2. 2g of sulphur and 1g of oxygen each contain the same number of atoms
點解呢句錯既!?佢地既atom數量唔係都係=(mole x avogadro constant)1x6.02x10^23 咁多架咩???

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作者: 鴨    時間: 7/3/2010 05:16 PM


oxygen is present in O2 under normal condition, but sulphur is S
so the no of mole of S is 2/32 while O is 1/32...

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作者: unlock-YM    時間: 7/3/2010 05:56 PM

oxygen is present in O2 under normal condition, but sulphur is S
so the no of mole of S is 2/32 while O is 1/32...
RX78-2 發表於 7/3/2010 05:16 PM

                               
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但咁樣只係話1g oxygen有1/32 moles of O2，但number of atoms仍然係L/16...

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作者: 鴨    時間: 7/3/2010 06:26 PM
喔
看錯了molecules
atoms的確是一樣的zzz

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作者: fish    時間: 8/3/2010 01:34 AM

one mole of sulphur atoms has a mass twice that of one mole of oxygen atoms.which of the following statement(s) is/are correct ?

2. 2g of sulphur and 1g of oxygen each contain the same number of atoms
點解呢句錯既!?佢地既atom數量唔係都係=(mole x avogadro constant)1x6.02x10^23 咁多架咩???
小霞的fans 發表於 7/3/2010 14:40

                               
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97年第34條...?
如果是的話它的答案是B. (2) only, 亦即是指這statement 是對的

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作者: 幻藍    時間: 9/3/2010 10:04 PM

97年第34條...?

fish 發表於 8/3/2010 01:34 AM

                               
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完全沒有可以吐槽的空間

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作者: 小霞的fans    時間: 10/3/2010 06:05 PM

97年第34條...?
如果是的話它的答案是B. (2) only, 亦即是指這statement 是對的
fish 發表於 7/3/2010 05:34 AM

                               
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嗯..我諗我打錯左-.- 係點解1係錯-0- ""
2 g of sulphur and 1 g of oxygen each occupy the same volume at room temperature and pressure

no of moles of sulphur atom=2/32=1/16mol
no of moles of oxyhen atom=1/16mol
佢地mol數1樣,,molar volume又係constant..點解唔係occupy same volume?

另外1題bio
if a human baby boy inherits a recessive allele from his mother,in which circumstance would be most likely show the trait coded for by the recessive allele?

A.the baby inherits the dominant allele from his father
B.the allele is o an autosomal chromosome and the baby is a twin
C.the allele is on the X chromosome
D.the allele is on the Y chromosome

我想問點解答案係C唔係D? 佢已經係媽媽度拎左條allele,,姐係X chromosome度已經有啦,,如果要show 個trait 唔係應該要有1條recessive allele 係爸爸(X chromsome)度先得咩? 另外不解autosomal chromosome點解= =""

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作者: unlock-YM    時間: 10/3/2010 11:39 PM

嗯..我諗我打錯左-.- 係點解1係錯-0- ""
2 g of sulphur and 1 g of oxygen each occupy the same volume at room temperature and pressure

no of moles of sulphur atom=2/32=1/16mol
no of moles of ox ...
小霞的fans 發表於 10/3/2010 06:05 PM

                               
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Sulphur唔係gas...

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作者: 小霞的fans    時間: 11/3/2010 03:48 PM
喔原來係咁..thx^^
仲有冇人知點解vascular bundle係stem度係locate係周圍而唔係中間??有咩重要性?

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作者: fish    時間: 12/3/2010 10:38 AM

仲有冇人知點解vascular bundle係stem度係locate係周圍而唔係中間??有咩重要性?

Structure implies function.
Vascular bundle 包含xylem, 除transport外還有support的作用
Stem有support 整株植物的作用, 如果把Vascular bundle集中於一點的話, support 會較弱,
如果將vascular  bundle分散去周圍的話就會較強
就好像大多建築物都靠要一堆樁/柱來支撐而不是只有一條樁/柱在中間一樣

if a human baby boy inherits a recessive allele from his mother,in which circumstance would be most likely show the trait coded for by the recessive allele?

A.the baby inherits the dominant allele from his father
B.the allele is o an autosomal chromosome and the baby is a twin
C.the allele is on the X chromosome
D.the allele is on the Y chromosome

我想問點解答案係C唔係D? 佢已經係媽媽度拎左條allele,,姐係X chromosome度已經有啦,,如果要show 個trait 唔係應該要有1條recessive allele 係爸爸(X chromsome)度先得咩? 另外不解autosomal chromosome點解= =""

Autosomal chromosome = autosome = non-sex chromosome
以人為例的話就是除XY外的22對chromosome了

題目所說的是baby boy, 男性, 所以他的sex chromosome是 XY (X from mother, Y from father)
如果那個recessive trait 是在 autosome上, 那就需要一對recessive allele 才會express
如果那個recessive trait 是在 Y chromosome上, 母親是不能該把trait遺傳給兒子的(因為Y from father)
如果那個recessive trait 是在 X chromsome上, 由於男性只有一條X chromosome而且必定是由母親給予的, 所以(在這case)那個recessive trait 理論上一定會express

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作者: 小霞的fans    時間: 23/3/2010 12:54 PM

Structure implies function.
Vascular bundle 包含xylem, 除transport外還有support的作用
Stem有support 整株植物的作用, 如果把Vascular bundle集中於一點的話, support 會較弱,
如果將vascular  bundle分散 ...
fish 發表於 11/3/2010 02:38 PM

                               
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謝謝你詳細的解答^^
我仲想呢..關於mitosis 既野..
1.at resting stage chromosomes appear as thin chromatins
2.when the cell is about to divide,replication of gentic materials begins.the chromatin threads condense to form distinct chromosomes.
3.the chromosomes become shorter and thicker.each chromosome appears as two identical chromatids.
4.the chromosomes line up in the middle of the cell.
5.the two chromatids of each chromosome seperate and move to opposite poles of the cell.the cell statrs to split into two daughter cells.
6.the chromatids become the chromosomes of the two daughter cells.

我想問1,2同埋3係唔係有1樣amount 既 genetic materials ? 係第3果度,each chromosome appears as two identical chromatids. 咁樣姐係話genetic materials double左?同第2果個replication of gentic materials 一樣?我唔係太搞得清邊d stage既genetic materials 既amount一樣..thx~

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作者: 小霞的fans    時間: 25/3/2010 04:30 PM
另外仲有1題..麻煩大大><

                               
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我唔識31條
其實我想知3 contract同4 contract 既時候隻腳既動作係點..
3同4係控制腳掌?? 我唔知佢地bring out 出黎既motion .. thx

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作者: 鴨    時間: 25/3/2010 08:15 PM
3 contract的話腳掌會變平
即是正常站立時的狀態
而4 contract的話腳掌會拉直
游水時應該會是拉直狀態吧zzz

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作者: 小霞的fans    時間: 27/3/2010 04:19 PM

3 contract的話腳掌會變平
即是正常站立時的狀態
而4 contract的話腳掌會拉直
游水時應該會是拉直狀態吧zzz
RX78-2 發表於 25/3/2010 12:15 AM

                               
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咁點解答案係C既?
個女仔隻腳掌都唔係平架..唔係應該係4 contract咩?

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作者: ice    時間: 27/3/2010 04:34 PM

咁點解答案係C既?
個女仔隻腳掌都唔係平架..唔係應該係4 contract咩?
小霞的fans 發表於 27/3/2010 04:19 PM

                               
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其實她右腳掌是平的
不平的是左腳掌
所以是3 contract

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作者: fish    時間: 28/3/2010 05:51 AM

謝謝你詳細的解答^^
我仲想呢..關於mitosis 既野..
1.at resting stage chromosomes appear as thin chromatins
2.when the cell is about to divide,replication of gentic materials begins.the chromatin  ...
小霞的fans 發表於 23/3/2010 12:54

                               
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Statement 2中 寫明了genetic materials replicate, 所以在2跟3有一樣amount 的genetic materials.
3的 "two chromatids" 亦是由 2的replication 而衍生出來的

下面的process中, 紅字為有duplicated DNA:
resting stage -->replication --> condensation --> line up--> separate --> pinching off
我知這個界線極曖昧又有灰色地帶, 不過在CE來說...這麼說較好(?)

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作者: 小霞的fans    時間: 9/4/2010 02:26 PM
另外呢..我想知道ventricle既blood volume同pressure既關係..
blood volume increase ==>pressure increase !?
因為我唔係太搞得清bicuspid,,tricuspid valve同semi-lunar valve幾時開幾時關閉..

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作者: 鴨    時間: 16/4/2010 12:33 AM


你指的是cardiac cycle中ventricle充血時會上升pressure?
ventricle 充血時是會上升些微的pressure
因為始終會有hydrostatic pressure 壓去肌肉的
不過這並不是valve開關的關鍵

Bicuspid和tricuspid開啟的時候都是atrial pressure大過ventricular pressure的時候
關的時候就剛剛相反
而這個的關鍵在於ventricle的contraction and relaxation
在ventricle contract的時候ventricular pressure是有明顯增長的
在增長至高過atrial pressure就會關閉bicuspid和tricuspid
而在relaxation的時候低過就會關閉
你可以相像bicuspid和tricuspid都是一道只能向ventricle推開的門
當atrium的力大過ventricle中的力就會推開
而ventricle的力大過atrium的力就會關閉
那些力就是pressure

而semi lunar valve亦是同樣道理
不過那道門是設定為只能向aorta/pulmonary artery開啟罷了

主導開關的是ventricle的活動
其實記著這個就可以了

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