1.Dễ
Which of these is qualitative data?
- AThe patient weighs 68 kg
- BThe pulse rate is 72 beats per minute
- CThe urine sample is dark yellow
- DThe wound is 3 cm long
2.Dễ
What is a decomposer?
- AAn animal that eats only plants
- BAn animal that hunts other animals
- CAn organism that makes food from sunlight
- DAn organism that breaks down dead material
3.Dễ
What is true of a recessive allele?
- AIt is always harmful to the organism
- BIt is found only on the X chromosome
- CIts trait shows whenever one copy is present
- DIts trait shows only when two copies are present
4.Trung bình
A student switches a light microscope from low power to high power. What happens to the field of view?
- AIt gets larger but less detailed
- BIt stays the same size but gets brighter
- CIt gets larger and brighter
- DIt gets smaller and usually darker
5.Trung bình
Which body system works with the respiratory system to deliver oxygen to body cells?
- AThe circulatory system
- BThe digestive system
- CThe urinary system
- DThe skeletal system
6.Trung bình
Vì sao nhiệt độ rất cao làm hầu hết enzyme ngừng hoạt động?
- AEnzyme di chuyển quá chậm để gặp cơ chất
- BCơ chất biến thành một enzyme khác
- CNhiệt làm enzyme phân rã ngay lập tức thành amino acid
- DEnzyme bị biến tính: trung tâm hoạt động thay đổi hình dạng
7.Khó
Two plants are crossed, and about half of the offspring show the dominant trait and half show the recessive trait. What are the most likely genotypes of the parents?
- AHeterozygous × heterozygous
- BHomozygous dominant × homozygous recessive
- CHeterozygous × homozygous recessive
- DHomozygous dominant × heterozygous
8.Khó
Why are modified viruses often used to deliver genes in gene therapy?
- AViruses produce antibodies that fix faulty genes
- BViruses are larger than human cells, so they can carry many genes
- CViruses can reproduce without a host cell
- DViruses naturally insert their genetic material into host cells
Đáp án
- 1. C · The urine sample is dark yellow
- 2. D · An organism that breaks down dead material
- 3. D · Its trait shows only when two copies are present
- 4. D · It gets smaller and usually darker
- 5. A · The circulatory system
- 6. D · Enzyme bị biến tính: trung tâm hoạt động thay đổi hình dạng
- 7. C · Heterozygous × homozygous recessive
- 8. D · Viruses naturally insert their genetic material into host cells
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