Cell Structures, Macromolecules, and Enzymes Quiz

Which statements about cell structures is TRUE? Select 2.

• Chloroplasts carry out photosynthesis in plant cells.

• Mitochondria carry out cellular respiration in animal cells.

• Vacuoles contain DNA and control the cell.

• The cell membrane provides rigid support for the cell.

Tags

NGSS.MS-LS1-2

Which cell structure is directly responsible for protein synthesis?

• Nucleus

• Ribosomes

• Mitochondria

• Cell Membrane

Which cell structure performs all of the following functions: controls cell activities, stores DNA, and sends instructions for making proteins?

• Ribosomes

• Golgi Apparatus

• Nucleus

• Vacuole

Tags

NGSS.MS-LS1-2

Which of the following correctly matches a macromolecule to its function?

• Proteins are composed of glycerol and fatty acids that act as insulation.

• Lipids are composed of sugars that act as energy storage.

• DNA is composed of nucleotides that store essential genetic information.

• Carbohydrates are composed of amino acids that fold into enzymes.

How do enzymes speed up chemical reactions?

• By denaturing in extreme temperature and pH.

• By altering the substrate shape so it becomes inactive.

• By increasing the energy required to start a reaction.

• By decreasing the energy required to start a reaction.

Tags

NGSS.HS-PS1-2

Why might enzymes stop working if temperature or pH changes too much?

• Enzymes need constant energy input, and these changes remove the energy.

• The shape of the enzyme changes, so the substrate no longer fits.

• Enzymes will release more products at high pH.

• The shape of the substrate changes permanently.

During an enzyme-catalyzed reaction, the substrates bind to the enzyme’s active site. What happens to the enzyme after the reaction?

• The enzyme is broken down with the substrates.

• The enzyme remains unchanged and can be reused.

• The enzyme permanently bonds to the product.

• The enzyme changes into a different substrate.