1.Dễ
What does DNA replication produce?
- ATwo identical DNA molecules
- BA new protein
- COne mRNA molecule
- DFour different DNA molecules
2.Dễ
What is peer review?
- AReading a textbook to learn a topic
- BAsking patients for their opinion of a treatment
- CRepeating your own experiment many times
- DExperts checking a study before it is published
3.Dễ
What does sterilisation mean?
- AReducing the number of microbes on the skin before an injection
- BKilling or removing all microorganisms, including spores
- CWashing away visible dirt with water
- DKilling only the viruses on a surface
4.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
5.Trung bình
What happens in the lytic cycle of a virus?
- AThe virus divides by binary fission outside the cell
- BThe host cell makes antibodies against the virus
- CThe virus makes many copies in the host cell, which then bursts
- DThe viral DNA joins the host DNA and stays inactive for a long time
6.Trung bình
Which kind of mutation can be passed on to a person's children?
- AA mutation in a liver cell caused by alcohol
- BA mutation in a white blood cell during infection
- CA mutation in a skin cell caused by sunlight
- DA mutation in a cell that forms eggs or sperm
7.Khó
A large molecule contains carbon, hydrogen, oxygen, nitrogen and phosphorus. Its monomers each have a sugar and a base. What type of molecule is it?
- AA nucleic acid
- BA carbohydrate
- CA protein
- DA lipid
8.Khó
Để tìm hiểu người trưởng thành trong một thành phố tập thể dục bao nhiêu, một nhà nghiên cứu chỉ khảo sát những người vừa ra khỏi phòng tập. Vấn đề chính là gì?
- ANhà nghiên cứu không có biến phụ thuộc
- BKhảo sát không bao giờ dùng được trong khoa học
- CMẫu bị lệch về những người năng vận động
- DMẫu quá ngẫu nhiên nên không có ích
Đáp án
- 1. A · Two identical DNA molecules
- 2. D · Experts checking a study before it is published
- 3. B · Killing or removing all microorganisms, including spores
- 4. A · Autosomal dominant
- 5. C · The virus makes many copies in the host cell, which then bursts
- 6. D · A mutation in a cell that forms eggs or sperm
- 7. A · A nucleic acid
- 8. C · Mẫu bị lệch về những người năng vận động
Lời giải đầy đủ từng bước: hãy luyện chủ đề này trên examproblems.com.