1.ง่าย
What is an inference?
- AA variable that the scientist changes on purpose
- BA measurement taken with a calibrated instrument in a laboratory
- CA list of the materials used in an experiment
- DA conclusion reached from observations and prior knowledge
2.ง่าย
Which group of biomolecules forms the basic bilayer of the cell membrane and also stores long-term energy?
- AProteins
- BLipids
- CCarbohydrates
- DNucleic acids
3.ง่าย
What is a eukaryote?
- AA virus that infects animal cells
- BAn organism made of a single cell without a nucleus
- CAn organism that lives only in extreme heat
- DAn organism whose cells have a nucleus
4.ปานกลาง
What happens in the lytic cycle of a virus?
- AThe host cell makes antibodies against the virus
- BThe virus divides by binary fission outside the cell
- CThe virus makes many copies in the host cell, which then bursts
- DThe viral DNA joins the host DNA and stays inactive for a long time
5.ปานกลาง
A thermometer gives readings of 36.1, 36.1 and 36.2 °C for a water bath that is really at 37.0 °C. How are these readings best described?
- ABoth accurate and precise
- BNeither accurate nor precise
- CPrecise but not accurate
- DAccurate but not precise
6.ปานกลาง
Which statement best describes biological evolution?
- AChange in the inherited traits of a population over generations
- BChange in the body of one organism during its lifetime
- CMovement of animals to a new habitat each year
- DGrowth of an organism from a single zygote to a fully grown adult
7.ยาก
A student puts a fertilised plant in a sunny window and an unfertilised plant in a dark cupboard. The fertilised plant grows more. What is the main flaw?
- AThe dependent variable was not measured
- BTwo variables were changed, so the cause is unclear
- CThere was no hypothesis to test
- DThe student used too much fertiliser on the plant in the window
8.ยาก
Why are modified viruses often used to deliver genes in gene therapy?
- AViruses are larger than human cells, so they can carry many genes
- BViruses produce antibodies that fix faulty genes
- CViruses can reproduce without a host cell
- DViruses naturally insert their genetic material into host cells
เฉลย
- 1. D · A conclusion reached from observations and prior knowledge
- 2. B · Lipids
- 3. D · An organism whose cells have a nucleus
- 4. C · The virus makes many copies in the host cell, which then bursts
- 5. C · Precise but not accurate
- 6. A · Change in the inherited traits of a population over generations
- 7. B · Two variables were changed, so the cause is unclear
- 8. D · Viruses naturally insert their genetic material into host cells
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