Aqa Gcse Combined Science Trilogy Higher Tier Chemistry Paper 2H 2

AQA GCSE COMBINED SCIENCE TRILOGY
HIGHER TIER CHEMISTRY PAPER 2H 2

ANSWERS


◉ What does a collection of a type specialised cells form? Answer: A
tissue.


◉ What does a collection of different tissues working together form?
Answer: An organ.


◉ What does a collection of organs working together form? Answer:
An organ system.


◉ What does a collection of organ systems form? Answer: An
organism.


◉ Why do enzymes have special shapes? Answer: So they can
catalyse reactions


◉ Why do enzymes only usually catalyse one reaction? Answer: For
an enzyme to work the substrate Hass to fit into its active site in the

, substrate doesn't match the enzymes active site then the reaction
wont be catalyzed


◉ What is the lock and key theory? Answer: the lock and key theory
states that an enzyme and corresponding active site work together
they need to match for instance a protein is catalyses by a protease


◉ What enzyme breaks down starch? Answer: amylase


◉ What enzyme breaks down proteins? Answer: protease


◉ What enzyme breaks down fat? Answer: lipase


◉ What enzyme breaks down carbohydrates? Answer:
Carbohydrase/amylase


◉ Give two examples of tissues and their roles. Answer: Muscular
tissue that moves muscles to contract and expand, and glandular
tissue that makes and secretes chemicals, and epithelial tissue that
covers some organ parts like the inside of the gut.


◉ Give one example of an organ and which tissues it is made of.
Answer: A stomach is made of muscular, glandular, and epithelial
tissues.