2009 年
生物 · 共 60 題 · 點擊選項即時核對答案
In which of the following cells can you find the gene coding for amylase?
The petal colour of pea plants is controlled by a pair of alleles. The allele for purple petals is dominant while the allele for white petals is recessive. Which of the following combinations of cross and result can confirm that a pea plant with purple petals is a homozygote?
| Cross | Result | |
|---|---|---|
| cross with a pea plant with white petals | ratio of offspring with purple petals to those with white petals is around 1:1 | |
| cross with a pea plant with white petals | all offspring have purple petals | |
| cross with a pea plant with purple petals | ratio of offspring with purple petals to those with white petals is around 3:1 | |
| cross with a pea plant with purple petals | all offspring have purple petals |
Questions 13 and 14 refer to the steps for making bread listed below. I. Mix flour, sugar, water and yeast to form a dough. II. Leave the dough aside for 30 minutes. III. Bake the dough in an oven at 240 °C for 30 minutes.
Which of the following combinations correctly lists the type of respiration and the product involved in raising the dough?
| Type of respiration | Product | |
|---|---|---|
| aerobic respiration | ATP | |
| aerobic respiration | water | |
| anaerobic respiration | carbon dioxide | |
| anaerobic respiration | alcohol |
Questions 13 and 14 refer to the steps for making bread listed below. I. Mix flour, sugar, water and yeast to form a dough. II. Leave the dough aside for 30 minutes. III. Bake the dough in an oven at 240 °C for 30 minutes.
Which of the following cannot increase the size of the dough?
A student used the following set-up to investigate the activity of an enzyme which catalyses the hydrolysis of starch to maltose. He wanted to find out the time required for the completion of the enzymatic reaction.
Which of the following combinations correctly states the test and the observation when the enzymatic reaction has completed?
| Test | Observation when the enzymatic reaction has completed | |
|---|---|---|
| Benedict’s test | red precipitate started to appear | |
| Benedict’s test | Benedict’s solution remained blue | |
| iodine test | iodine solution started to turn blue black | |
| iodine test | iodine solution remained brown |
Which of the following correctly describes the difference between an athlete and an office worker who are of the same sex, age and body size?
If a person consumes a large amount of carbohydrates in his diet, the excess carbohydrates will be converted to storage forms which can be stored
Insect P feeds on cereal grains only and insect Q feeds on mammalian blood only. Which of the following enzymes are necessary for digestion in these insects?
| Insect P | Insect Q | |
|---|---|---|
| amylase and catalase | catalase and lipase | |
| amylase and protease | lipase and protease | |
| lipase and protease | amylase and protease | |
| catalase and lipase | amylase and catalase |
Which of the following contributes the least to strengthening our bones?
Which of the following is a feature common to an air sac and an intestinal villus for facilitating the diffusion of materials?