1.ง่าย
What is the resolution of a microscope?
- AIts ability to show two close points as separate
- BHow many times larger it makes the image of the specimen
- CHow large the field of view is
- DHow bright the image appears
2.ง่าย
เอนไซม์ส่วนใหญ่จัดอยู่ในกลุ่มชีวโมเลกุลใด
- Aลิพิด
- Bคาร์โบไฮเดรต
- Cแร่ธาตุ
- Dโปรตีน
3.ง่าย
Which of these is qualitative data?
- AThe urine sample is dark yellow
- BThe patient weighs 68 kg
- CThe pulse rate is 72 beats per minute
- DThe wound is 3 cm long
4.ปานกลาง
What is the role of cholesterol in animal cell membranes?
- AIt stores the cell's genetic information
- BIt forms a rigid wall around the cell
- CIt keeps membrane fluidity stable as temperature changes
- DIt carries glucose molecules across the membrane into the cell
5.ปานกลาง
A person catches chickenpox once and does not usually become ill with it again. Why?
- AMemory cells give a faster, stronger response the next time
- BThe skin becomes thicker after the first infection
- CAntibodies from the first infection turn into new viruses
- DThe virus stays in the blood and kills new viruses
6.ปานกลาง
A seedling is 4 cm tall at week 1, 8 cm at week 2, 12 cm at week 3 and 16 cm at week 4. If the trend continues, how tall will it be at week 6?
- A32 cm
- B20 cm
- C24 cm
- D18 cm
7.ยาก
Bacteria in a closed flask grow quickly at first, but the population then stops increasing. What is the main reason?
- AThe bacteria stop dividing once they reach adult size
- BThe bacteria change into viruses after many divisions
- CThe flask becomes too cold for growth
- DNutrients run out and waste products build up
8.ยาก
The field of view of a microscope is 0.5 mm wide. About 10 cells fit across it in a line. What is the approximate width of one cell?
- A50 µm
- B0.5 µm
- C500 µm
- D5 µm
เฉลย
- 1. A · Its ability to show two close points as separate
- 2. D · โปรตีน
- 3. A · The urine sample is dark yellow
- 4. C · It keeps membrane fluidity stable as temperature changes
- 5. A · Memory cells give a faster, stronger response the next time
- 6. C · 24 cm
- 7. D · Nutrients run out and waste products build up
- 8. A · 50 µm
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