AQA Exam Answers
AQA Exam-style Questions
Cell activity
1. a) - A : nucleus - B : mitochondria
- C : ribosomes - D : plasmids b) The nucleus controls all activities within the cell. It also contains genetic materials used to create new cells.
c) Plasmids and genetic materials in cytoplasm
d) i 75 ii 28 iii 0.15
e) Protein can be used to build up cells as it is a structural component of every cells. It is also an enzyme as well.
f) There are no mitochondria in bacterial cells because they are single-cellular organisms, so they are very small and do not need energy.
2. a) Root hair cells are found at the root of plants. They help plants to absorb water and mineral ions from soil efficiently. Mesophyll cells are found in leaves. They carry out gas exchange and photosynthesis in plants. b) Root hair cells are adapted to increase the rate of diffusion of water and mineral ions from soil to be as quick as possible. The …show more content…
ii The long chains of amino acid in the enzymes are folded and twisted into specific 3D shapes called the active site. This shape allows substrate with matching shape to fit into the enzyme and bind together. iii Denature iv Temperature and pH c) Protein is found in many tissues in the body such as muscles, as it is a main structural component that build up the tissues. Hormones are also protein which helps to control many body functions and take part in homeostasis such as, insulin hormones control the blood sugar level in the body. Antibodies that re part of immune system are also proteins. They help to protect the bpdy by engulf or digest foreign molecules entering it.
2. a) microorganisms b) i Protease ii amino acid c) i 14 minutes ii enzyme X iii Temperature and pH
Cell activity
1. a) - A : nucleus - B : mitochondria
- C : ribosomes - D : plasmids b) The nucleus controls all activities within the cell. It also contains genetic materials used to create new cells.
c) Plasmids and genetic materials in cytoplasm
d) i 75 ii 28 iii 0.15
e) Protein can be used to build up cells as it is a structural component of every cells. It is also an enzyme as well.
f) There are no mitochondria in bacterial cells because they are single-cellular organisms, so they are very small and do not need energy.
2. a) Root hair cells are found at the root of plants. They help plants to absorb water and mineral ions from soil efficiently. Mesophyll cells are found in leaves. They carry out gas exchange and photosynthesis in plants. b) Root hair cells are adapted to increase the rate of diffusion of water and mineral ions from soil to be as quick as possible. The …show more content…
ii The long chains of amino acid in the enzymes are folded and twisted into specific 3D shapes called the active site. This shape allows substrate with matching shape to fit into the enzyme and bind together. iii Denature iv Temperature and pH c) Protein is found in many tissues in the body such as muscles, as it is a main structural component that build up the tissues. Hormones are also protein which helps to control many body functions and take part in homeostasis such as, insulin hormones control the blood sugar level in the body. Antibodies that re part of immune system are also proteins. They help to protect the bpdy by engulf or digest foreign molecules entering it.
2. a) microorganisms b) i Protease ii amino acid c) i 14 minutes ii enzyme X iii Temperature and pH