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How many strands does an RNA molecule usually have?

1. AOne
2. BFour
3. CThree
4. DTwo

Which group of biomolecules forms the basic bilayer of the cell membrane and also stores long-term energy?

1. ALipids
2. BProteins
3. CCarbohydrates
4. DNucleic acids

What is the main job of the large central vacuole in a plant cell?

1. AIt stores water and keeps the cell firm
2. BIt captures light energy for photosynthesis
3. CIt assembles proteins from amino acids
4. DIt copies DNA before the cell divides

Apa yang terjadi pada reaksi sintesis dehidrasi?

1. APolimer dipecah dengan menambahkan satu molekul air
2. BSel mengering dan mati
3. CAir dikeluarkan dari sel melalui osmosis
4. DDua monomer bergabung dan satu molekul air dilepaskan

Apa struktur dasar virus?

1. AMateri genetik di dalam selubung protein
2. BSatu sel dengan ribosom dan mitokondria
3. CRantai asam amino tanpa DNA atau RNA
4. DNukleus yang dikelilingi dinding sel

A student's hypothesis is "Salt water slows the growth of bean seedlings." Which is a prediction based on it?

1. ASalt water is made of sodium chloride and water
2. BSeedlings given salt water will grow less than those given plain water
3. CBean seedlings need sunlight and water to grow well
4. DSeedlings given plain water will die within a week

A food sample turns purple with biuret reagent but stays yellow-brown with iodine solution. What does the sample contain?

1. AProtein but no starch
2. BBoth protein and starch
3. CStarch but no protein
4. DFat but no protein

How does a phospholipid differ from a triglyceride?

1. AOne of the fatty acids is replaced by a phosphate group
2. BIt contains no glycerol, only fatty acids and phosphate
3. CIt has four fatty acids instead of three
4. DIt is made of amino acids