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Question 1

standard error

Answer 1

shows the reliability of the mean
- small standard error indicates that mean is more reliable

Question 2

how are transport protein held within the membrane

Answer 2

forms bond with hydrophilic heads, and hydrophobic parts form bonds with hydrophobic tails
bond like hydrophobic interactions and hydrogen.

Question 3

why is the concentration of x described as logarithmic

Answer 3

because each interval is a factor of 10