2013年1月2日 星期三

中四生物練習: 第5章




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九龍塘學校(中學部)
中四生物科
第五章練習 (I)

參考答案
Q.1
a     油漬試驗                                                                                                     1
      濾紙上加一滴食物樣本,                                                                        1
      靜置5分鐘,讓濾紙乾透。在光線下,觀察濾紙上有沒有半透明點       1
      把濾紙放入有機溶劑,然後取出濾紙,讓它乾透。                                    1
      在光線下,再次觀察濾紙。半透明點的消失顯示食物樣本含有脂肪。       1
b    這種食品可能含有糖/碳水化合物。                                                          1
      過量碳水化合物會轉化成脂質,儲存在皮膚下,形成皮下脂肪。              1
c     身體不能儲存過多的氨基酸,這些氨基酸會在肝經脫氨作用分解。           1
      高蛋白質的膳食會加重肝的工作量。                                                          1
d      任何兩項:                                                                                                                   1 × 2
        維生素C有助生長和修補結締組織。
維生素C能使傷口加快癒合。   
維生素C能保持齒齦和皮膚健康。
                                                                                                                   (11)

書後練習 (P.31)
1
2
3
4
5
6
7
D
D
A
B
D
D
D
                                                                                                                   (7)

Q.8

                                                                                                                   (6)

Q.12
a      i       B                                                                                                                                         1
                因為它含豐富維生素A                                                                                                  
        ii      A                                                                                                                                         1
                因它是兩種含有高能量提供成份總質量的食物中,有較高脂質比例的                         
                [雖然AE所含的提供能量食物成份 (碳水化合物、蛋白質和脂質)比例相若地最高,但E的主要是碳水化合物,而A所含的是脂肪  (E的碳水化合物分量),但是等量的脂肪能釋出較碳水化合物更多能量 (兩倍有多)]
        iii     C                                                                                                                                         1
                因為它蛋白質含蛋白質幫助形成新細胞及組織對生長很重要。                  
        iv     E                                                                                                                                          1
                因為它只含碳水化合物(糖是一種碳水化合物)                                                          
        v      A                                                                                                                                         1
                因為它豐富維生素D,幫助有效吸收鈣形成及質強化骨骼。                                  
        vi     B                                                                                                                                         1
                因為它豐富維生素C,保持血管健康。                                                                      
b      因為高溫會破壞食物中的維生素C                                                                                1
                                                                                                                   (7)
Q.15
a      i       等量本立德溶液食物樣本的液體放在試管中混和。                            1
                把混合物放在沸水浴中分鐘,仔細觀察混合液的變化。                         0.5
                出現磚紅色沉澱物表示有還原糖                                                                 0.5
        ii      把一滴食物樣本的液體放入滴試板的孔內。                                                 0.5
                尿蛋白試紙放入樣本,並觀察任何顏色的改變。                                     0.5
                如果樣本含蛋白質,尿蛋白試紙會由黃色變成藍綠色                                1
b      CD                                                                                                                  0.5 x 2
        理由:
        C在碘液試驗、尿蛋白試紙試驗和DCPIP溶液試驗中呈正反應。                    0.5
        D在本立德試驗和碘液試驗中呈正反應。                                                             0.5
c      C:澱粉、蛋白質和維生素C                                                                                      2
        D:還原糖和澱粉                                                                                                         2
d      這碳水化合物可能是帶甜味的非還原糖。由於它沒有還原糖的特性,
        所以它不會在本立德試驗中呈正反應。                                                                    1
        它可能是蔗糖。                                                                                                            1
e      使用尿糖試紙去測試葡萄糖。                                                                                    1
        如果含有葡萄糖,尿糖試紙會由粉紅色變成紫色。                                                1
                                                                                                                   (14)

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