Užduočių lapas tema Biologija slaugos stojamiesiems egzaminams su atsakymais

What is activation energy?

1. AThe heat released when a reaction finishes
2. BThe energy plants take in from sunlight
3. CThe energy stored in a molecule of ATP
4. DThe energy needed to start a chemical reaction

What is a mutagen?

1. AA cell that divides without control
2. BSomething that can cause changes in DNA
3. CA protein that repairs damaged DNA
4. DAn enzyme that copies DNA

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

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

Kurioje mitozės fazėje seserinės chromatidės traukiamos į priešingus polius?

1. AInterfazėje
2. BAnafazėje
3. CProfazėje
4. DMetafazėje

A tablet contains 2,5 g of a substance. How many milligrams is this?

1. A0,0025 mg
2. B25 mg
3. C2500 mg
4. D250 mg

What happens to an enzyme after it has catalysed a reaction?

1. AIt changes into the substrate
2. BIt is released unchanged and can be used again
3. CIt is broken down into amino acids
4. DIt becomes part of the product and leaves with it

Why are there usually far fewer top predators than herbivores in an ecosystem?

1. AHerbivores eat the young of top predators
2. BTop predators need less energy than herbivores
3. CTop predators reproduce faster than herbivores, so they die sooner
4. DEnergy is lost at each step, leaving little for the top level

Two parents are both carriers of cystic fibrosis, an autosomal recessive disorder. They have three children. What is the probability that none of the three is affected?

1. A27/64
2. B3/4
3. C1/64
4. D9/16