1.ง่าย
What is phagocytosis?
- AA cell releasing hormones by exocytosis
- BA cell dividing into two identical daughter cells
- CA cell taking in small droplets of fluid
- DA cell engulfing large particles such as bacteria
2.ง่าย
What does xylem carry in a plant?
- AOxygen from the leaves to the roots
- BSeeds from the flowers to the soil
- CSugars from the leaves to the roots
- DWater and minerals from the roots upward
3.ง่าย
What is a scientific law?
- AAn explanation that has been proven wrong
- BA rule that scientists vote to accept
- CA guess about the cause of something that has not yet been tested
- DA statement of what always happens under certain conditions
4.ปานกลาง
The sodium-potassium pump moves ions across the cell membrane. What does one cycle of the pump do?
- AMoves Na⁺ in and K⁺ out, without using ATP
- BMoves 3 Na⁺ out and 2 K⁺ in, using ATP
- CMoves 2 Na⁺ out and 3 K⁺ in, using ATP
- DMoves 3 K⁺ out and 2 Na⁺ in, using ATP
5.ปานกลาง
What is an inversion mutation?
- AA segment of a chromosome moves to a different, non-matching chromosome
- BA whole extra chromosome is added to the cell
- CA chromosome segment breaks off and is reattached the wrong way round
- DA segment of a chromosome is lost completely
6.ปานกลาง
เซลล์เม็ดเลือดแดงถูกวางในน้ำบริสุทธิ์ มีแนวโน้มจะเกิดอะไรขึ้นมากที่สุด
- Aคงขนาดเดิม
- Bแบ่งตัวเป็นสองเซลล์
- Cหดตัวและย่น
- Dบวมและอาจแตก
7.ยาก
ผสมถั่วลันเตาสองต้นที่เป็น AaBb ทั้งคู่ ยีนอยู่บนโครโมโซมต่างแท่งกัน คาดว่าลูกหลานสัดส่วนเท่าใดจะแสดงลักษณะด้อยทั้งสองลักษณะ (aabb)
- A1/16
- B1/4
- C9/16
- D3/16
8.ยาก
Some snakes and whales have tiny remains of hip bones that are not used for walking. What do these structures suggest?
- ATheir ancestors had legs
- BThe bones are needed for swimming
- CThey will grow legs in the future
- DThey were caused by a recent mutation
เฉลย
- 1. D · A cell engulfing large particles such as bacteria
- 2. D · Water and minerals from the roots upward
- 3. D · A statement of what always happens under certain conditions
- 4. B · Moves 3 Na⁺ out and 2 K⁺ in, using ATP
- 5. C · A chromosome segment breaks off and is reattached the wrong way round
- 6. D · บวมและอาจแตก
- 7. A · 1/16
- 8. A · Their ancestors had legs
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