1.Dễ
Dụng cụ nào được dùng để quan sát từng tế bào riêng lẻ?
- AKính thiên văn
- BNhiệt kế
- CMáy quang phổ cho âm thanh
- DKính hiển vi
2.Dễ
What is an ecosystem?
- AA single organism together with all of its organs and tissues
- BAll the members of one species in an area
- CThe weather in a particular region
- DThe living things in an area and their non-living surroundings
3.Dễ
What is a neuron?
- AA nerve cell that carries electrical signals
- BA muscle cell that contracts
- CA blood cell that carries oxygen around the body
- DA bone cell that stores calcium
4.Trung bình
A patient's blood type is B positive. What does this mean?
- ATheir plasma contains anti-B antibodies
- BTheir red cells carry no antigens at all
- CTheir red cells carry the B antigen and the RhD antigen
- DTheir red cells carry the A antigen and no RhD antigen
5.Trung bình
A tall pea plant could be TT or Tt. Which cross will best reveal its genotype?
- ACross it with a TT plant
- BCross it with a short (tt) plant
- CLet it grow for a longer time
- DCross it with another tall plant
6.Trung bình
In evolution, what does an organism's fitness mean?
- AHow long the organism lives
- BHow strong and fast the organism is compared with others
- CHow large the organism grows
- DHow many offspring it leaves that survive and reproduce
7.Khó
In an onion root tip, 90 of 100 cells are in interphase and 10 are in mitosis. If the whole cell cycle takes 20 hours, about how long does mitosis last?
- A2 hours
- B10 hours
- C0,5 hours
- D18 hours
8.Khó
Cyanide stops mitochondria from making ATP. Which process in the affected cells would stop first?
- APumping of Na⁺ and K⁺ by the sodium-potassium pump
- BOsmosis of water across the membrane
- CSimple diffusion of oxygen into the cell
- DFacilitated diffusion of glucose down its gradient
Đáp án
- 1. D · Kính hiển vi
- 2. D · The living things in an area and their non-living surroundings
- 3. A · A nerve cell that carries electrical signals
- 4. C · Their red cells carry the B antigen and the RhD antigen
- 5. B · Cross it with a short (tt) plant
- 6. D · How many offspring it leaves that survive and reproduce
- 7. A · 2 hours
- 8. A · Pumping of Na⁺ and K⁺ by the sodium-potassium pump
Lời giải đầy đủ từng bước: hãy luyện chủ đề này trên examproblems.com.