Užduočių lapas tema Biologija slaugos stojamiesiems egzaminams su atsakymais

Kokios formos yra DNR molekulė?

1. APlokščias žiedas
2. BTrigubė spiralė
3. CDviguba spiralė
4. DViena tiesi grandinė

What does gel electrophoresis separate?

1. ADNA fragments by size
2. BCells by their shape
3. CBlood into plasma and cells
4. DChromosomes by their colour

In which form do animals store glucose in the liver and muscles?

1. AChitin
2. BStarch
3. CGlycogen
4. DCellulose

What is a random sample?

1. AA group where everyone in the population has an equal chance of being chosen
2. BA group made only of people who volunteer to take part
3. CA group chosen by the researcher because they are easy to reach and willing
4. DA group chosen because they are likely to support the hypothesis

Yeast in bread dough breaks down sugar without oxygen. What does it produce?

1. AOxygen and water
2. BGlucose and oxygen
3. CEthanol and carbon dioxide
4. DLactic acid and carbon dioxide

What are introns?

1. ACodons that tell the ribosome to stop translation
2. BShort pieces of DNA made on the lagging strand
3. CCoding sections joined together to form the mature mRNA
4. DNon-coding sections removed from pre-mRNA before translation

Two genes lie very close together on the same chromosome. In a test cross, most offspring look like the parents instead of the expected 1:1:1:1 ratio. Why?

1. AThe genes are linked and are rarely separated by crossing over
2. BThe genes are on different chromosomes and assort independently
3. CA frameshift mutation happened in both genes
4. DBoth genes show incomplete dominance

The coding part of an mRNA is 900 bases long, including the start codon and the stop codon. How many amino acids are in the protein?

1. A900
2. B300
3. C298
4. D299