Užduočių lapas tema Biologija slaugos stojamiesiems egzaminams su atsakymais

Kokie yra nukleorūgščių, pavyzdžiui, DNR, monomerai?

1. AGlicerolio molekulės
2. BGliukozės molekulės
3. CNukleotidai
4. DAminorūgštys

What is a mutagen?

1. AA protein that repairs damaged DNA
2. BA cell that divides without control
3. CAn enzyme that copies DNA
4. DSomething that can cause changes in DNA

What is natural selection?

1. AIndividuals with helpful traits survive and reproduce more
2. BAnimals choosing which mates they like best, so traits change at random
3. COrganisms changing their genes when they need to
4. DHumans breeding plants for useful traits

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. BAn equal mix of all three sheep
3. CThe sheep that gave the egg cell
4. DThe sheep that gave the body cell nucleus

Red-green colour blindness is X-linked recessive. A colour-blind woman (XᵇXᵇ) has children with a man with normal colour vision (XᴮY). What fraction of their sons is expected to be colour-blind?

1. ANone
2. BAll
3. COne half
4. DOne quarter

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

1. A25 mg
2. B0,0025 mg
3. C2500 mg
4. D250 mg

Kodėl dauguma ląstelių yra labai mažos?

1. AMažos ląstelės turi daugiau DNR nei didelės
2. BMažoms ląstelėms deguonies nereikia
3. CDidelės ląstelės negali turėti mitochondrijų
4. DMažos ląstelės turi didelį paviršiaus ploto ir tūrio santykį

A dihybrid cross gives offspring in a ratio of about 9 : 3 : 3 : 1. What does this suggest?

1. ABoth parents are homozygous dominant for both genes
2. BOne parent is AaBb and the other is homozygous aabb
3. CThe two genes are tightly linked on the same chromosome
4. DBoth parents are heterozygous for two genes that assort independently