Unit 4 Biomolecules/Enyzmes

Nucleic acids are biomolecules. Which of the following is the function of nucleic acids?

• Serve as the primary structural unit of biological membranes.

• Serve as energy storage.

• Store and transport genetic information.

• Serve as a biological catalyst.

Which structure is the enzyme?

• Structure A

• Structure B

• Structure C

• Structure D

In living organisms, proteins can function as -

• inorganic compounds

• sources of stored energy

• transmitters of genetic information

• catalysts of chemical reactions

All enzymes are examples of organic molecules known as -

• proteins

• carbohydrates

• lipids

• nucleic acids

Which is the MOST valid conclusion based on this graph?

• Enzymes are not affected greatly by temperature.

• Enzymes work most effectively at low temperatures.

• Raising the temperature always makes an enzyme work better.

• Enzyme function decreases after a certain favorable temperature.

All sugars are examples of organic molecules known as -

• proteins

• carbohydrates

• lipids

• nucleic acids

Both lipids and carbohydrates can be used by the cell as -

• building blocks for RNA.

• sources of energy.

• catalyst for metabolic reactions.

• replacement for salts.

Carbohydrates are more easily metabolized than lipids. However, on a gram-for-gram basis lipids provide cells with more -

• nitrogen

• proteins

• structure

• energy

Which four of the elements listed below are among the most abundant elements in biomolecules?

• Flourine, Carbon, Hydrogen, Ironu

• Carbon, Hydrogen, Nitrogen, Oxygen

• Phosphorus, Sulfur, Carbon, Oxygen

• Flourine, Hydrogen, Carbon, Iodine

The graph shows the effect of temperature on the relative rate of enzyme activity.

Which statement is a valid conclusion based on the information in the graph?

• The optimum temperature of the enzyme is 30 degrees C.

• The optimum temperature of the enzyme is 58 degrees C.

• The enzyme is denatured completely at 45 degrees C.

• The enzyme is completely denatured after 60 degrees C.