1.Dễ
Which carbohydrate forms plant cell walls and acts as dietary fibre?
- AGlycogen
- BCellulose
- CGlucose
- DLactose
2.Dễ
What does transfer RNA (tRNA) do?
- AIt carries the code out of the nucleus
- BIt brings amino acids to the ribosome
- CIt copies DNA in the nucleus
- DIt joins two DNA strands together
3.Dễ
What is a eukaryote?
- AAn organism made of a single cell without a nucleus
- BA virus that infects animal cells
- CAn organism that lives only in extreme heat
- DAn organism whose cells have a nucleus
4.Trung bình
Which is the correct way to write the scientific name of the gut bacterium?
- AEscherichia Coli
- Bcoli Escherichia
- CEscherichia coli
- DEscherichia Coli
5.Trung bình
Trình tự nào bổ sung với mạch DNA A-T-G-C-C-A?
- AT-A-C-G-G-T
- BA-T-G-C-C-A
- CG-C-A-T-T-G
- DU-A-C-G-G-U
6.Trung bình
In a pedigree, a trait appears in every generation, and every affected child has at least one affected parent. Which inheritance pattern is most likely?
- AAutosomal dominant
- BA new mutation in each generation
- CAutosomal recessive
- DX-linked recessive
7.Khó
A nurse notices that patients who used a new mouthwash had few mouth infections. No other patients were studied. What is most needed before concluding that the mouthwash works?
- AA larger bottle of the same mouthwash for each patient
- BA longer explanation in the report
- CA comparable group that does not use the mouthwash
- DA survey asking patients if they liked it
8.Khó
Two parents are both AaBbCc, and the three genes assort independently. What is the probability that a child is aabbcc?
- A1/16
- B1/64
- C1/8
- D3/64
Đáp án
- 1. B · Cellulose
- 2. B · It brings amino acids to the ribosome
- 3. D · An organism whose cells have a nucleus
- 4. C · Escherichia coli
- 5. A · T-A-C-G-G-T
- 6. A · Autosomal dominant
- 7. C · A comparable group that does not use the mouthwash
- 8. B · 1/64
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