Užduočių lapas tema Biologija slaugos stojamiesiems egzaminams su atsakymais

Su kuria baze DNR visada jungiasi adeninas?

1. ACitozinu
2. BUracilu
3. CGuaninu
4. DTiminu

Dauguma fermentų priklauso kuriai biomolekulių grupei?

1. AAngliavandeniams
2. BLipidams
3. CMineralinėms medžiagoms
4. DBaltymams

Which of these hormones is a steroid?

1. AInsulin
2. BGlucagon
3. CTestosterone
4. DGrowth hormone

Dolly the sheep was cloned by putting the nucleus of an adult body cell into an egg cell whose nucleus had been removed. Whose nuclear DNA did Dolly have?

1. AThe sheep that carried the pregnancy
2. BThe sheep that gave the egg cell
3. CThe sheep that gave the body cell nucleus
4. DAn equal mix of all three sheep

When plotting the results of an experiment, which variable usually goes on the y-axis?

1. AThe dependent variable
2. BThe time the experiment started
3. CThe independent variable
4. DThe controlled variable

Kodėl gramteigiamos bakterijos Gramo dažymo metu nusidažo purpurine spalva?

1. AJų storoji peptidoglikano sienelė sulaiko purpurinį dažą
2. BJos turi chlorofilo
3. CJų ploną sienelę dengia lipidais turtinga išorinė membrana
4. DJos visai neturi ląstelės sienelės

Fertiliser washes from farmland into a lake. Algae grow rapidly, then die, and later many fish die. What is the main cause of the fish deaths?

1. AThe algae release carbon dioxide that poisons fish
2. BBacteria decomposing the dead algae use up the oxygen
3. CThe fish eat too many algae and become ill
4. DThe fertiliser is directly poisonous to fish

The antibiotic tetracycline binds to bacterial ribosomes. Which process does it block, and why are human cells much less affected?

1. ATranslation, because human cells have no ribosomes
2. BDNA replication, because bacteria have no DNA polymerase
3. CTranscription, because human cells have no RNA polymerase of their own
4. DTranslation, because bacterial ribosomes differ from human ribosomes