Enzymes Q2

Which is a characteristic of an enzyme?

• The activation energy increases.

• The shape of the enzyme changes.

• The enzyme-substrate complex forms.

• The bonds between substrates are broken.

What part of an enzyme determines the substrate on which the enzyme will work?

• The substrate

• The products

• The active site

• The substrate concentration

What do enzymes require in order to act as biocatalysts in cells?

• ATP

• Substrates

• Nucleotides

• Activation energy

Why are restriction enzymes used by biotechnologists to cut small pieces of DNA from larger strands?

• Restriction enzymes cut the sugar-phosphate backbones without damaging the nitrogen bases because of its specificity.

• Restriction enzymes cut the nitrogen bases without damaging the sugar-phosphate backbones.

• Restriction enzymes soften the DNA so that it can be cut with a scalpel under a microscope.

• Restriction enzymes harden the DNA so that it can be broken under a microscope.

How do enzymes act as catalysts?

• Lower activation time

• Lower activation energy

• Increased activation time

• Increased activation energy

To which category of organic compounds do enzymes belong?

• Lipids

• Proteins

• Nucleic acids

• Carbohydrates

Why are enzymes essential to organisms?

• They are catalysts for biochemical reactions in cells.

• They provide short term and long term energy for the cells.

• They provide instructions for protein synthesis and determine traits.

• They create semipermeable barriers in the cell that separates the inside and outside of the cell.

Which role do enzymes play in cells?

• They are biosubstrates that speed up chemical reactions.

• They are biosubstrates that decrease chemical reactions.

• They are biocatalysts that decrease the activation energy in chemical reactions.

• They are biocatalysts that increase and decrease the activation energy in chemical reactions.

Which best describes the characteristic of reactions that enzymes function to lower?

• Activation energy

• Termination energy

• Product concentration

• Reactant concentration

Enzymes act as biological catalysts. How does an enzyme speed up a chemical reaction?

• It increases the activation energy.

• It decreases activation energy.

• It creates more reactants.

• It creates less substrate.