1.Dễ
What is a trait that is controlled by many genes called?
- AA recessive trait
- BA codominant trait
- CA polygenic trait
- DA sex-linked trait
2.Dễ
What is phagocytosis?
- AA cell releasing hormones by exocytosis
- BA cell engulfing large particles such as bacteria
- CA cell taking in small droplets of fluid
- DA cell dividing into two identical daughter cells
3.Dễ
What are the three parts of a nucleotide?
- AA carboxyl group, a base and a lipid
- BA phosphate, a sugar and a nitrogen base
- CAn amino group, a sugar and a fatty acid
- DA glycerol, a phosphate and a fatty acid
4.Trung bình
Mạch khuôn DNA đọc là T-A-C. Codon mRNA tương ứng là gì?
- AU-T-G
- BA-T-G
- CA-U-G
- DT-A-C
5.Trung bình
A cell has a nucleus and mitochondria but no cell wall and no chloroplasts. What kind of cell is it most likely to be?
- AAn animal cell
- BA fungal cell
- CA bacterial cell
- DA plant cell
6.Trung bình
A tall pea plant could be TT or Tt. Which cross will best reveal its genotype?
- ACross it with a TT plant
- BLet it grow for a longer time
- CCross it with a short (tt) plant
- DCross it with another tall plant
7.Khó
Cyanide stops mitochondria from making ATP. Which process in the affected cells would stop first?
- AOsmosis of water across the membrane
- BSimple diffusion of oxygen into the cell
- CFacilitated diffusion of glucose down its gradient
- DPumping of Na⁺ and K⁺ by the sodium-potassium pump
8.Khó
An Rh-negative mother gives birth to an Rh-positive baby. Why could a later Rh-positive pregnancy be at risk?
- AThe second baby will be unable to make any red cells
- BThe first baby's antibodies remain in her blood and attack her
- CHer red cells may become Rh positive after the birth
- DShe may have made anti-D antibodies that cross the placenta
Đáp án
- 1. C · A polygenic trait
- 2. B · A cell engulfing large particles such as bacteria
- 3. B · A phosphate, a sugar and a nitrogen base
- 4. C · A-U-G
- 5. A · An animal cell
- 6. C · Cross it with a short (tt) plant
- 7. D · Pumping of Na⁺ and K⁺ by the sodium-potassium pump
- 8. D · She may have made anti-D antibodies that cross the placenta
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