In a school laboratory, agar plates are incubated at 25 ∘C25\ ^\circ\text{C}25 ∘C rather than at 37 ∘C37\ ^\circ\text{C}37 ∘C.
Which statement explains why?
Bacteria are killed at temperatures above 30 ∘C30\ ^\circ\text{C}30 ∘C.
It reduces the chance of growing pathogens that could harm humans.
The agar jelly would melt and run off the plate at 37 ∘C37\ ^\circ\text{C}37 ∘C.
The enzymes in all bacteria are denatured at 37 ∘C37\ ^\circ\text{C}37 ∘C.
181 exam-style questions on OCR GCSE Biology 6.3 Monitoring and maintaining health, covering 6.3.1 Health and disease, 6.3.2 Interactions between diseases, 6.3.3 Spread of communicable diseases, 6.3.4 Common infections and diseases, 6.3.5 Physical plant defence responses, 6.3.6 Chemical plant defence responses, 6.3.7 Detecting and identifying plant diseases, 6.3.8 White blood cells and platelets, 6.3.9 Non-specific defence systems, 6.3.10 The immune system, 6.3.11 Monoclonal antibodies, 6.3.12 Vaccines and medicines, 6.3.13 Aseptic techniques, 6.3.14 Discovery and development of new medicines, 6.3.15 Causes of non-communicable diseases, 6.3.16 Treatments for cardiovascular disease, 6.3.17 Lifestyle factors and non-communicable diseases, 6.3.18 Cancer, 6.3.19 Stem cells in medicine, 6.3.20 Gene technology in medicine, and 6.3.21 The human genome and medicine. Each one has a worked solution and a mark scheme showing where the marks go.