Užduočių lapas tema Biologija slaugos stojamiesiems egzaminams su atsakymais

What is a stem cell?

1. AA cell that carries oxygen in the blood
2. BA plant cell found only in the stem
3. CA fully specialised cell that can no longer divide or change its type
4. DAn unspecialised cell that can divide and become other cell types

What is an antigen?

1. AA molecule that the immune system sees as foreign
2. BA drug that kills viruses
3. CA protein that carries oxygen
4. DA white blood cell that engulfs and digests bacteria

In science, what is an observation?

1. AA guess about why something happens
2. BA rule that explains all known facts
3. CA conclusion drawn before any data are collected
4. DInformation gathered with the senses or instruments

What happens to a protein when it is denatured?

1. AIt loses some of its amino acids but keeps its folded shape
2. BIt loses its 3D shape but keeps its amino acid sequence
3. CIt turns into a carbohydrate
4. DIt becomes more active than before

What happens in the lytic cycle of a virus?

1. AThe virus divides by binary fission outside the cell
2. BThe host cell makes antibodies against the virus
3. CThe virus makes many copies in the host cell, which then bursts
4. DThe viral DNA joins the host DNA and stays inactive for a long time

What causes cohesion between water molecules?

1. ACovalent bonds between neighbouring molecules
2. BMagnetic forces between hydrogen atoms
3. CIonic bonds between oxygen atoms
4. DHydrogen bonds between neighbouring molecules

Two parents who both have a genetic condition have a child who does not. Assuming a single gene, what inheritance pattern does this show?

1. AAutosomal recessive, with both parents homozygous
2. BAutosomal recessive, with both parents heterozygous
3. CX-linked recessive, with the father as a carrier
4. DAutosomal dominant, with both parents heterozygous

Fleming saw a clear area with no bacteria around a Penicillium mould growing on a bacterial plate. What was the best explanation?

1. AThe bacteria had turned into mould cells
2. BThe mould used up all of the oxygen that the nearby bacteria needed
3. CThe mould released a substance that killed or stopped the bacteria
4. DThe bacteria had moved away to find more food