1.Easy
What is an antigen?
- AA drug that kills viruses
- BA protein that carries oxygen
- CA molecule that the immune system sees as foreign
- DA white blood cell that engulfs and digests bacteria
2.Easy
What is a decomposer?
- AAn animal that eats only plants
- BAn organism that makes food from sunlight
- CAn organism that breaks down dead material
- DAn animal that hunts other animals
3.Easy
Which elements make up carbohydrates?
- ACarbon, hydrogen and oxygen
- BCarbon, hydrogen and nitrogen
- CHydrogen, oxygen and phosphorus
- DCarbon, nitrogen and sulfur
4.Medium
A tablet contains 2.5 g of a substance. How many milligrams is this?
- A0.0025 mg
- B25 mg
- C2500 mg
- D250 mg
5.Medium
An organism is multicellular, makes its own food by photosynthesis and has cell walls of cellulose. Which kingdom does it belong to?
- APlants
- BBacteria
- CAnimals
- DFungi
6.Medium
Which polymer is correctly matched with its monomer?
- AProtein and nucleotide
- BStarch and glucose
- CDNA and amino acid
- DGlycogen and fatty acid
7.Hard
Why does the body store long-term energy as fat rather than as glycogen?
- AGlycogen cannot be broken down into glucose
- BFat dissolves easily in blood
- CFat is a type of protein
- DFat holds more than twice the energy per gram
8.Hard
Mature human red blood cells have no nucleus and no mitochondria. What follows from this?
- AThey keep making new haemoglobin throughout their life
- BThey make ATP by aerobic respiration using the oxygen they carry
- CThey cannot divide and make their ATP by glycolysis only
- DThey live longer than almost all other body cells
Answer key
- 1. C · A molecule that the immune system sees as foreign
- 2. C · An organism that breaks down dead material
- 3. A · Carbon, hydrogen and oxygen
- 4. C · 2500 mg
- 5. A · Plants
- 6. B · Starch and glucose
- 7. D · Fat holds more than twice the energy per gram
- 8. C · They cannot divide and make their ATP by glycolysis only
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