1992 年
生物 · 共 58 題 · 點擊選項即時核對答案
Injection of insulin into the vein of a mammal lowers its blood glucose level. This is because
Which of the following statements about insulin is true ?
An amoeba was put in a solution X for 3 minutes and the average number of contractile vacuoles discharged per minute was recorded. The experiment was repeated by putting the amoeba in solutions Y and Z in turn and the result in each case was recorded as shown below :
| Solution | Average number of contractile vacuoles discharged per minute |
|---|---|
| X | 0 |
| Y | 20 |
| Z | 10 |
Which of the following can be deduced from the experimental results ?
Urea is formed in
Questions 46 and 47 refer to the diagrammatic representation of a part of the nervous system in a frog. The basic structural organization of the nervous system of a frog is similar to that of a mammal.
The parts labelled X, Y and Z are :
| X | Y | Z | |
|---|---|---|---|
| white matter | ventral root | dorsal root | |
| white matter | dorsal root | ventral root | |
| grey matter | ventral root | dorsal root | |
| grey matter | dorsal root | ventral root |
Questions 46 and 47 refer to the diagrammatic representation of a part of the nervous system in a frog. The basic structural organization of the nervous system of a frog is similar to that of a mammal.
Application of an electric current of suitable strength onto a nerve fibre will set off a nerve impulse. A segment of structure Z between points 1 and 2 is cut and removed. An electric current is then applied at points 1 and 2 in turn. What would be the responses of the frog’s leg ?
| Point 1 | Point 2 | |
|---|---|---|
| contracting | no response | |
| no response | contracting | |
| contracting | contracting | |
| no response | no response |
The flow diagram below shows the basic pattern of nervous co-ordination in mammals :
Stimulus → Receptor → [X] → Effector → Response
X can be
The vibration of sound waves in the mammalian ear is amplified by
Which of the following body characteristics can be inherited ?
Two grey rats are mated. The female gives birth to 2 young grey and 6 young black rats. Which of the following deductions is correct ?