Chapter 5: Plant Biochemistry

Enzymes are biologically active because they:

• Are carbohydrates

• Lower activation energy

• Raise temperature

• Provide energy

Which of the following is a disaccharide?

• Glucose

• Fructose

• Sucrose

• Starch

Which polysaccharide is used by plants for energy storage?

• Glycogen

• Cellulose

• Chitin

• Starch

Which enzyme is used to cut DNA at specific sites?

• Restriction enzyme

• DNA polymerase

• Ligase

• Helicase

Which part of Agrobacterium tumefaciens is modified to carry foreign genes into plant cells?

• Ribosome

• Plasmid

• Nucleus

• Cell wall

The term GMO stands for:

• Genetic Mutation Option

• Genetically Managed Organism

• Genetically Modified Organism

• Gene Monitoring Operation

What type of biomolecule are enzymes?

• Proteins

• Lipids

• Carbohydrates

• Nucleic acids

Which of the following factors does not affect enzyme activity?

• pH

• Temperature

• Substrate concentration

• Light intensity

What happens to most enzymes at high temperatures (above their optimum)?

• They become more active

• They are converted to fats

• They denature

• They multiply

Enzyme specificity means that:

• Enzymes act only at night

• Enzymes only act on one kind of substrate

• Enzymes work only in acidic conditions

• Enzymes can be used many times