1.Dễ
What is a decomposer?
- AAn animal that hunts other animals
- BAn organism that makes food from sunlight
- CAn organism that breaks down dead material
- DAn animal that eats only plants
2.Dễ
What is a trait that is controlled by many genes called?
- AA sex-linked trait
- BA polygenic trait
- CA recessive trait
- DA codominant trait
3.Dễ
What is the active site of an enzyme?
- AThe region where the substrate binds
- BThe part of the cell where the enzyme is made
- CThe product formed by the reaction
- DThe gene that codes for the enzyme
4.Trung bình
What happens in the lytic cycle of a virus?
- AThe virus divides by binary fission outside the cell
- BThe viral DNA joins the host DNA and stays inactive for a long time
- CThe virus makes many copies in the host cell, which then bursts
- DThe host cell makes antibodies against the virus
5.Trung bình
Which body system works with the respiratory system to deliver oxygen to body cells?
- AThe urinary system
- BThe digestive system
- CThe circulatory system
- DThe skeletal system
6.Trung bình
Kết quả của một thí nghiệm phù hợp với dự đoán của giả thuyết. Kết luận nào là tốt nhất?
- AGiả thuyết nay đã trở thành một quy luật của tự nhiên
- BKhông bao giờ cần thêm thí nghiệm nào nữa
- CGiả thuyết được ủng hộ, nhưng chưa được chứng minh
- DGiả thuyết được chứng minh là đúng trong mọi trường hợp
7.Khó
Ignoring crossing over, how many different combinations of chromosomes can one person's gametes have because of independent assortment?
- A2 × 23, which is 46
- B23², about 529
- C2²³, about 8 million
- D46, one for each chromosome
8.Khó
A survey finds that students who sleep more get higher test scores. Which study would best test whether more sleep causes better scores?
- AAsk the students with the highest scores how they study
- BSurvey a much larger group of students about their sleep habits
- CRandomly assign students to different sleep times and compare their scores
- DCompare the test scores of students at two different schools
Đáp án
- 1. C · An organism that breaks down dead material
- 2. B · A polygenic trait
- 3. A · The region where the substrate binds
- 4. C · The virus makes many copies in the host cell, which then bursts
- 5. C · The circulatory system
- 6. C · Giả thuyết được ủng hộ, nhưng chưa được chứng minh
- 7. C · 2²³, about 8 million
- 8. C · Randomly assign students to different sleep times and compare their scores
Lời giải đầy đủ từng bước: hãy luyện chủ đề này trên examproblems.com.