BR 56 -Biomolecules & Enzymes

Proteins and polysaccharides are polymers. These polymers are formed by dehydration synthesis. Which statement correctly identifies a difference in the structure of proteins and polysaccharides?

• Only polysaccharides are made of repeating units of cytosine, adenine, guanine, and thymine.

• Only proteins are formed from amino acids joined by peptide bonds.

• Only polysaccharides can be folded and twisted to very specific shapes.

• Only proteins can be large molecules with thousands of subunits.

Which of these best represents a fatty-acid molecule?

• 
• 
• 
• 

Overheating an enzyme results in the enzyme’s loss of —

• net electrical charge

• ability to catalyze a reaction

• storage of a large amount of chemical energy

• storage of inherited information

Tags

NGSS.HS-PS1-5

Which of the following biological molecules is correctly paired with one of the functions it primarily serves in living cells?

• nucleic acids - store genetic information

• lipids - catalyze chemical reactions

• carbohydrates - component of cytoskeleton

• proteins - long term energy storage

In red blood cells, the compound carbonic anhydrase increases the rate at which carbon dioxide is converted to bicarbonate ions for transport in the blood. In red blood cells, carbonic anhydrase acts as which of the following?

• an enzyme

• a hormone

• a lipid

• a sugar

Which best describes how enzymes function in the body?

• Enzymes are converted into products by the reactions they catalyze.

• Enzymes lower the activation energy of reactions.

• One enzyme can catalyze many different reactions.

• An enzyme is used once and then destroyed by the cell.

Which statement describes the major role of lipids within a cell?

• They cause DNA to replicate.

• They move RNA in the cytoplasm.

• They catalyze chemical reactions in the cell.

• They are the main components of membranes.

Most cellular activities are processes regulated (controlled) by the action of —

• carbohydrates

• enzymes

• lipids

• polysaccharides

Proteins and nucleic acids both contain the element nitrogen, but only proteins contain which of the following elements?

• carbon

• hydrogen

• phosphorous

• sulfur

Certain biomolecules contain information in their structure that can be used to determine the relatedness of two different species. Which set below is studied for this information?

• lipids and proteins

• proteins and carbohydrates

• lipids and carbohydrates

• nucleic acids and proteins