Užduočių lapas tema Biologija slaugos stojamiesiems egzaminams su atsakymais

In which stage of the cell cycle does a cell spend most of its time?

1. AProphase
2. BMetaphase
3. CInterphase
4. DAnaphase

What does it mean that a cell membrane is selectively permeable?

1. AIt lets no substance cross at all
2. BIt lets every substance cross freely in both directions
3. CIt lets some substances cross but not others
4. DIt lets only water molecules cross

In genetics, what is a carrier?

1. AA person with two recessive alleles who has the disorder
2. BA person who has lost both alleles for the gene, so shows no trait
3. CA person with one recessive allele for a disorder but no symptoms
4. DA person who has a dominant disorder

What do the spindle fibres do during cell division?

1. AThey copy the DNA of each chromosome before the cell divides
2. BThey attach to chromosomes and move them to the poles
3. CThey digest the old cell membrane
4. DThey make the new nuclear envelope

Sickle cell disease is caused by a single base change that replaces one amino acid in haemoglobin. What type of mutation is this?

1. AA nonsense mutation
2. BA frameshift mutation
3. CA missense mutation
4. DA silent mutation

What is an inversion mutation?

1. AA segment of a chromosome moves to a different, non-matching chromosome
2. BA whole extra chromosome is added to the cell
3. CA segment of a chromosome is lost completely
4. DA chromosome segment breaks off and is reattached the wrong way round

A human body cell has 46 chromosomes in G1. How many chromatids does it have at metaphase of mitosis?

1. A92
2. B46
3. C184
4. D23

Which parent's gamete decides the biological sex of a human baby, and why?

1. AThe mother's, because she gives two X chromosomes
2. BThe father's, because a sperm carries either an X or a Y
3. CBoth equally, because each gives one Y chromosome
4. DThe mother's, because an egg carries either an X or a Y