Molecular Biology

What property of water makes it suitable as a coolant?

• It takes a lot of energy to increase the temperature of water.

• It takes a lot of energy for water to evaporate.

• Water molecules are cohesive and stick to the skin.

• Water is a good solvent so it can transport heat from the body.

What are the most frequently occurring elements in living organisms?

• calcium, phosphorus, iron and sodium

• calcium, sodium, nitrogen and phosphorus

• calcium, sodium, nitrogen and phosphorus

• nitrogen, carbon, oxygen and hydrogen

Which type of chemical reaction is an example of anabolism?

• Photolysis

• Combustion

• Hydrolysis

• Condensation

Which reaction is an example of catabolism?

• Photolysis of water

• Denaturation of a protein by a change in pH

• Production of maltose from amylose by amylase

• Condensation of glucose to form starch

What feature of carbon makes it most suitable as a basis for life?

• Its abundance in nature

• Its bonding properties

• Its reactivity to light

• Its presence in the early atmosphere of the Earth

Which properties explain the ability of water to dissolve solutes?

I. Polarity of water molecules

II. High specific heat capacity of water

III. Hydrogen bonding

• I and II only

• I and III only

• II and III only

• I, II and III

Which property of water accounts for its moderating effects on the Earth’s atmosphere?

• Cohesive

• Thermal

• Transparency

• Adhesive

Where do hydrogen bonds form?

• Between the slight negative charge of hydrogen and slight positive charge of oxygen within a water molecule

• Between the slight negative charge of hydrogen and slight positive charge of oxygen within a water molecule

• Between the slight positive charge of hydrogen and slight negative charge of oxygen in different water molecules

• Between the slight negative charge of hydrogen and slight positive charge of oxygen in different water molecules

Which type of reaction is the breakdown of starch into sugars?

• Denaturation

• Reduction

• Catabolic

• Condensation

Which molecule is a polysaccharide?

• Cellulose

• Fructose

• Maltose

• Sucrose