1.ง่าย
What are the parts of a triglyceride (a fat molecule)?
- AThree glucose units and one phosphate
- BTwo glycerols and one fatty acid
- COne glycerol and three fatty acids
- DOne amino acid and three fatty acids
2.ง่าย
Which characteristic is shared by all living things?
- AThey respond to changes in their environment
- BThey have a backbone and a brain
- CThey are made of many cells
- DThey make their own food by photosynthesis
3.ง่าย
เครื่องมือใดใช้ดูเซลล์แต่ละเซลล์
- Aกล้องโทรทรรศน์
- Bกล้องจุลทรรศน์
- Cเทอร์มอมิเตอร์
- Dเครื่องสเปกโทรมิเตอร์วัดเสียง
4.ปานกลาง
In a food chain, which organisms are the producers?
- APlants and algae that make food by photosynthesis
- BAnimals that eat only plants, such as rabbits and deer
- CPredators at the top of the chain
- DFungi that break down dead material
5.ปานกลาง
Which statement about identical and non-identical twins is correct?
- AIdentical twins come from one zygote; non-identical twins come from two
- BBoth kinds of twin always share all of their genes
- CNon-identical twins come from one zygote that splits in two
- DIdentical twins come from two eggs that are fertilised by a single sperm
6.ปานกลาง
During childbirth, pressure on the cervix causes oxytocin release, which causes stronger contractions and more pressure. What kind of control is this?
- APositive feedback
- BNegative feedback
- CNatural selection
- DHomeostatic balance
7.ยาก
A farmer's crops grow poorly in soil lacking nitrates. Why do plants need nitrogen?
- ATo make amino acids, proteins and nucleic acids
- BTo absorb more carbon dioxide through the stomata
- CTo make glucose during photosynthesis
- DTo build cellulose cell walls
8.ยาก
A study finds that coffee drinkers have more lung cancer. Later it is found that coffee drinkers in the study also smoked more. What is smoking in this study?
- AA placebo
- BThe dependent variable
- CA confounding variable
- DThe control group
เฉลย
- 1. C · One glycerol and three fatty acids
- 2. A · They respond to changes in their environment
- 3. B · กล้องจุลทรรศน์
- 4. A · Plants and algae that make food by photosynthesis
- 5. A · Identical twins come from one zygote; non-identical twins come from two
- 6. A · Positive feedback
- 7. A · To make amino acids, proteins and nucleic acids
- 8. C · A confounding variable
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