Робочий аркуш «Біологія для вступних іспитів на медсестринство» з відповідями

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

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

Яка основна структура клітинної мембрани?

1. AТовста стінка з пептидоглікану
2. BФосфоліпідний бішар із вбудованими білками
3. CЄдиний шар молекул крохмалю
4. DЖорсткий шар целюлозних волокон і лігніну

Що таке фенотип?

1. AКількість хромосом у гаметі
2. BСпостережувана ознака, наприклад колір очей
3. CПорядок основ у гені
4. DПара алелів, які організм має для гена

Nearly all cells in a person's body contain the same DNA. Why do nerve cells and muscle cells look and work so differently?

1. AEach cell type has a different set of chromosomes
2. BNerve cells have lost the genes for muscle proteins
3. CDifferent genes are switched on in each type of cell
4. DMuscle cells have extra DNA from mitochondria

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

1. A2500 mg
2. B0,0025 mg
3. C250 mg
4. D25 mg

To insert a human gene into a bacterial plasmid, scientists cut both the gene and the plasmid with the same restriction enzyme. Why?

1. ASo the gene is turned into RNA
2. BSo the plasmid loses all its genes
3. CSo both pieces become exactly the same length
4. DSo the cut ends match and can join together

At 100× total magnification, the field of view of a microscope is 2 mm wide. What is its width at 400×?

1. A2 mm
2. B0,5 mm
3. C8 mm
4. D0,2 mm

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

1. AOne parent is AaBb and the other is homozygous aabb
2. BBoth parents are heterozygous for two genes that assort independently
3. CBoth parents are homozygous dominant for both genes
4. DThe two genes are tightly linked on the same chromosome