EOC Biochem Biology practice Test ***

What is the essential element common to all biological molecules?

• carbon

• potassium

• iron

• nitrogen

What is the role of DNA in protein synthesis?

• to transfer amino acids to the ribosomes

• to help form the peptide bonds between amino acids

• to determine the sequence of amino acids in the protein

• to carry the code for the amino acid sequence to the ribosomes

Which substances act as a catalyst for metabolism?

• enzymes

• hormones

• nucleic acids

• vitamins

What will most likely happen if the level of carbon dioxide available to a plant is

reduced?

• The plant will take in more water.

• The plant will take in less nitrogen.

• The plant will produce more oxygen.

• The plant will produce less glucose.

Which substance provides energy to the cell to carry out active transport?

• mRNA

• DNA

• tRNA

• ATP

Which molecules store information related to the function of a cell in the form of a

coded message?

• nucleic acids

• lipids

• enzymes

• carbohydrates

Which double-stranded molecule stores genetic information in cells?

• ADP

• ATP

• DNA

• RNA

These graphs show the effects of temperature and pH on a certain enzyme found

in the human digestive system.

Which can best be concluded from the graphs?

• The enzyme is most effective at 30°C and a pH of 5.

• The enzyme is most effective at 40°C and a pH of 8.

• The enzyme is most effective at 40°C and a pH of 4.

• The enzyme is most effective at 60°C and a pH of 11.

What effect would the absence of oxygen have on the processes that occur in the

mitochondria?

• The mitochondria would begin making oxygen.

• The mitochondria would begin making glucose.

• The mitochondria would produce limited ATP.

• The mitochondria would prevent enzyme production.

What is required for paramecia to maintain homeostasis?

• radiation from the sun

• release of energy by ATP

• a thick cell wall

• an environment without water