1.ง่าย
Which pigment absorbs light energy for photosynthesis?
- AKeratin
- BChlorophyll
- CMelanin
- DHaemoglobin
2.ง่าย
Which sex chromosomes does a typical human male have?
- AYY
- BXY
- CX only
- DXX
3.ง่าย
Which kind of organism causes malaria?
- AA virus spread by coughing
- BA protist carried by mosquitoes
- CA fungus that grows on skin
- DA bacterium carried in water
4.ปานกลาง
Why can DNA profiling (fingerprinting) identify individual people?
- AEach person's genes code for different amino acids
- BRepeated non-coding DNA regions vary in length between people
- CEvery person has a different number of chromosomes in their cells
- DDNA in blood differs from DNA in skin
5.ปานกลาง
What are introns?
- ANon-coding sections removed from pre-mRNA before translation
- BCoding sections joined together to form the mature mRNA
- CShort pieces of DNA made on the lagging strand
- DCodons that tell the ribosome to stop translation
6.ปานกลาง
ดีเอ็นเอถูกคัดลอกเมื่อใดในวัฏจักรเซลล์
- Aในระยะ S ของอินเทอร์เฟส
- Bในไมโอซิส II เท่านั้น
- Cในระยะเมทาเฟสของไมโทซิส
- Dในระหว่างไซโทไคเนซิส
7.ยาก
A colour-blind man (XᵇY) has children with a woman who carries the allele (XᴮXᵇ). What is the probability that a daughter is colour-blind?
- A0
- B1/2
- C1
- D1/4
8.ยาก
How does a phospholipid differ from a triglyceride?
- AIt is made of amino acids
- BOne of the fatty acids is replaced by a phosphate group
- CIt contains no glycerol, only fatty acids and phosphate
- DIt has four fatty acids instead of three
เฉลย
- 1. B · Chlorophyll
- 2. B · XY
- 3. B · A protist carried by mosquitoes
- 4. B · Repeated non-coding DNA regions vary in length between people
- 5. A · Non-coding sections removed from pre-mRNA before translation
- 6. A · ในระยะ S ของอินเทอร์เฟส
- 7. B · 1/2
- 8. B · One of the fatty acids is replaced by a phosphate group
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