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

Which group of biological molecules includes fats, oils and cholesterol?

1. ANucleic acids
2. BProteins
3. CCarbohydrates
4. DLipids

What are the units of molarity?

1. AMoles of solute per kilogram of the solvent used
2. BGrams of solute per litre of solution (g/L)
3. CGrams of solute per 100 g of solution
4. DMoles of solute per litre of solution (mol/L)

What is an electrolyte?

1. AA metal that conducts electricity as a solid
2. BA gas that dissolves in blood
3. CA substance that forms ions and conducts electricity when dissolved in water
4. DA substance that dissolves as whole molecules without forming any ions

What is carbon-14 dating used for?

1. AEstimating the age of material that was once alive
2. BDetecting carbon monoxide in a room
3. CFinding the exact age of rocks that are billions of years old
4. DMeasuring body temperature

During digestion, large molecules are broken down by adding water across their bonds. What is this reaction called?

1. AHydrolysis
2. BPolymerisation
3. CCombustion
4. DCondensation

How does atomic radius change going down a group?

1. AIt stays the same
2. BIt decreases
3. CIt decreases, then increases
4. DIt increases

Which statement correctly distinguishes a scientific law from a scientific theory?

1. AA theory becomes a law once it is proved
2. BLaws apply only to chemistry, theories only to biology
3. CA law is only a guess, while a theory is a proven fact
4. DA law describes what happens; a theory explains why it happens

Gently heating DNA separates its two strands, but each strand stays in one piece. Why?

1. AThe two strands are joined by ionic bonds that melt first
2. BHeat converts DNA into a protein
3. CEach strand is held together by hydrogen bonds, while the two strands are joined by covalent bonds
4. DThe strands are held together by weak hydrogen bonds, while each strand's backbone is covalent