1.ง่าย
เซลล์ร่างกายทั่วไปของมนุษย์มีโครโมโซมกี่แท่ง
- A44
- B92
- C23
- D46
2.ง่าย
What is apoptosis?
- AFusion of two gametes
- BDivision of the cytoplasm
- CUncontrolled cell division
- DProgrammed cell death
3.ง่าย
In the scientific name Homo sapiens, what does Homo name?
- AThe kingdom
- BThe genus
- CThe species
- DThe family
4.ปานกลาง
Red-green colour blindness is X-linked recessive. A colour-blind woman (XᵇXᵇ) has children with a man with normal colour vision (XᴮY). What fraction of their sons is expected to be colour-blind?
- ANone
- BOne half
- COne quarter
- DAll
5.ปานกลาง
A tablet contains 2.5 g of a substance. How many milligrams is this?
- A0.0025 mg
- B25 mg
- C2500 mg
- D250 mg
6.ปานกลาง
What is the role of ribosomal RNA (rRNA)?
- AIt carries the code from DNA to the ribosome
- BIt brings single amino acids to the ribosome
- CIt stores genetic information in the nucleus
- DIt forms part of the ribosome and helps join amino acids
7.ยาก
Mature human red blood cells have no nucleus and no mitochondria. What follows from this?
- AThey keep making new haemoglobin throughout their life
- BThey live longer than almost all other body cells
- CThey cannot divide and make their ATP by glycolysis only
- DThey make ATP by aerobic respiration using the oxygen they carry
8.ยาก
Which statement correctly compares DNA replication and transcription?
- AReplication copies all the DNA; transcription copies one gene
- BBoth take place on ribosomes in the cytoplasm
- CReplication makes RNA from DNA; transcription makes DNA from RNA
- DBoth use thymine and deoxyribose in the new strand
เฉลย
- 1. D · 46
- 2. D · Programmed cell death
- 3. B · The genus
- 4. D · All
- 5. C · 2500 mg
- 6. D · It forms part of the ribosome and helps join amino acids
- 7. C · They cannot divide and make their ATP by glycolysis only
- 8. A · Replication copies all the DNA; transcription copies one gene
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