1.Dễ
Glucose là ví dụ về loại phân tử nào?
- APolysaccharide
- BMonosaccharide
- CLipid
- DProtein
2.Dễ
What is homeostasis?
- AChanging a species over many generations
- BMaking identical copies of a cell
- CBreaking down food for energy
- DKeeping a stable internal environment
3.Dễ
What are stomata?
- AGreen structures in the leaf that store starch
- BSmall pores in leaves that allow gas exchange
- CHairs on roots that absorb minerals
- DTubes that carry water up the stem
4.Trung bình
A greenhouse is warm and brightly lit, but the air has very little carbon dioxide. What is most likely limiting the rate of photosynthesis?
- AThe number of stomata
- BThe temperature
- CThe light intensity in the greenhouse
- DThe carbon dioxide concentration
5.Trung bình
Người có nhóm máu AB có cả kháng nguyên A và B trên hồng cầu. Đây là kiểu di truyền nào?
- AAllele A trội hoàn toàn so với B
- BTrội không hoàn toàn
- CDi truyền liên kết giới tính
- DĐồng trội
6.Trung bình
Why do root hair cells have long, thin extensions?
- ATo store starch for the winter
- BTo anchor the plant firmly against strong winds and rain
- CTo carry out photosynthesis underground
- DTo increase the surface area for absorbing water
7.Khó
A pre-mRNA is 3000 bases long, and 1200 bases of introns are removed. If all remaining bases code for amino acids, what is the largest number of amino acids in the protein?
- A1000
- B400
- C600
- D1800
8.Khó
In Tay-Sachs disease, a lysosomal enzyme does not work. What happens inside the affected nerve cells?
- AThe DNA cannot be copied before division
- BThe undigested substance builds up inside lysosomes
- CThe cells can no longer make ATP in their mitochondria
- DThe ribosomes stop making proteins
Đáp án
- 1. B · Monosaccharide
- 2. D · Keeping a stable internal environment
- 3. B · Small pores in leaves that allow gas exchange
- 4. D · The carbon dioxide concentration
- 5. D · Đồng trội
- 6. D · To increase the surface area for absorbing water
- 7. C · 600
- 8. B · The undigested substance builds up inside lysosomes
Lời giải đầy đủ từng bước: hãy luyện chủ đề này trên examproblems.com.