Biology 7402: Organisms Respond to Changes in Their Internal and External Environments Topical Past Paper Questions

Osteoarthritis (OA) is a disease resulting in joint damage which causes stiffness. Scientists investigated the use of a drug called pralnacasan to treat OA in 80 mice. The scientists: - injected the knee joints of mice with an enzyme to cause joint damage - split the mice randoml…

Describe how stimulation of a Pacinian corpuscle produces a generator potential. [3 marks] Scientists investigated the stimulation of a Pacinian corpuscle in the skin of a fingertip. The scientists applied two different pressures to the fingertip and recorded the changes in membr…

Figure 4 shows a diagram of a Pacinian corpuscle. Figure 4 1 Name the structures labelled P, Q and R shown in Figure 4. [2 marks] P Q R ___ Two students (A and B) investigated reaction time in response to touch. - Student A sat with her eyes shut and her forearm resting on a work…