Химия для вступительных экзаменов на сестринские программы: лист заданий с ответами

What are enzymes?

1. AFats that form most of the cell membrane
2. BBiological catalysts, usually proteins
3. CSugars that store energy in the liver
4. DMinerals that build bone

Which form of sugar dissolves fastest in a cup of tea?

1. AGranulated sugar
2. BA sugar cube
3. CAll forms dissolve at the same rate
4. DA large lump of rock sugar

Какая частица атома почти не имеет массы по сравнению с остальными?

1. AЯдро в целом
2. BПротон
3. CНейтрон
4. DЭлектрон

Which bond joins amino acids together in a protein?

1. AA peptide bond
2. BAn ionic bond
3. CA hydrogen bond
4. DA glycosidic bond

A red blood cell is placed in pure water (a hypotonic solution). What happens?

1. ASalt enters the cell, which shrinks
2. BWater enters the cell, which swells and may burst
3. CWater leaves the cell, which shrinks and wrinkles
4. DNothing happens to the cell

On an energy diagram, the products are at a lower energy than the reactants. What kind of reaction is shown?

1. AEndothermic
2. BExothermic
3. CReversible only
4. DNuclear

A compound is 40% carbon, 6,7% hydrogen and 53,3% oxygen by mass (C = 12, H = 1, O = 16). What is its empirical formula?

1. ACH₄O
2. BCHO
3. CC₂HO
4. DCH₂O

Element A has 1 valence electron and element B has 7 valence electrons, both in period 3. Which statement best compares them?

1. ABoth are metalloids
2. BBoth are unreactive because they are in the same period
3. CA is a reactive metal and B is a reactive nonmetal
4. DA is a nonmetal and B is a metal