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Question 1

Describe the mechanism of glucose symport.

Answer 1

1. Sodium-potassium pump pumps
   Na+ out of cell
2. Sodium-potassium pump
   generates lower concentration of
   Na+ within cell
3. (Glucose) symporter/transporter
   transports Na+ down its
   concentration gradient
   OR
   Sodium diffuses in via the
   transporter
4. Alongside/together with glucose
   (which is transported against its
   concentration gradient)

Question 2

State the term for a checklist of animal behaviours

Answer 2

Ethogram

Question 3

Why does producing a checklist of animal behaviours increase the validity of a study?

Answer 3

Allows the data collection between sample periods to be compared

Reduced the variability of the interpretation of behaviour