OCR A Level Biology - Enzymes

What are enzymes?

• Biological catalysts

• Inorganic compounds

• Proteins

• Carbohydrates

What is the role of enzymes?

• To speed up chemical reactions

• To slow down chemical reactions

• To change the nature of chemical reactions

• To stop chemical reactions

What is the structure of enzymes?

• Globular proteins with complex tertiary structures

• Linear proteins with simple structures

• Fibrous proteins with quaternary structures

• Nucleic acids with double helix structures

Where are enzymes produced?

• Inside cells

• Outside cells

• Both inside and outside cells

• In the nucleus

What is an example of an extracellular enzyme?

• Amylase

• Insulin

• Hemoglobin

• DNA polymerase

What happens to enzymes at extreme temperatures?

• They denature and become non-operational

• They become more active

• They change their structure

• They multiply

What is the function of trypsin?

• To break down proteins into peptides and amino acids

• To hydrolyze starch into maltose

• To digest fats into fatty acids and glycerol

• To convert glucose into glycogen

What is the site of action for intracellular enzymes?

• Inside the cell

• Outside the cell

• In the bloodstream

• In the mitochondria

What is the site of action for extracellular enzymes?

• Outside the cell

• Inside the cell

• In the nucleus

• In the cytoplasm

Why are enzymes essential for life?

• They catalyze virtually every metabolic reaction in living organisms

• They provide structural support to cells

• They store genetic information

• They regulate body temperature