Chapter 3

Question 0

receptor protein

Answer 0

top of protein has unique shape, when molecule fits on top of protein, changes are seen in protein, then within cell//the other molecule just binds, then info is sent//a hormone like insulin fits on a insulin receptor
protein causing the shape to alter

Question 1

Cell Membrane

Answer 1

surrounds cell made up of proteins and lipids ////lipids are actually in 2 layers called lipid bilayer molecules of cell membrane made up of phospholipids polar phosphate head and 2 non-polar fatty acid tails
water on inside and outside of cell ////polar heads attracted to water, non-polar tails repel water various proteins are in the membrane
only small, non-polar molecules can pass through bilayer oxygen can pass

Question 2

marker protein

Answer 2

marker protein used to recognize cells // also indicate if cells is blood, muscle, etc. // doctors must match marker proteins for organ transplant
top part of protein is a carbohydrate

Question 3

channel protein

Answer 3

protein channels that help substances go across the membrane

Question 4

Passive Transport

Answer 4

water and molecules inside and outside the cell need to be in homeostasis some movement of substances across don’t take energy
molecules are in constant motion molecules naturally go from a higher contraction to a lower concentration to be in equilibrium

Question 5

concentration gradient

Answer 5

the difference in concentration of substances of substances across a space

Question 6

diffusion

Answer 6

type of passive transport where substance are mixed by random motion high to low concentration

Question 7

osmosis

Answer 7

type of passive transport where water moves through the membrane by diffusion water moves by special channel protein only for water no energy needed

Question 8

facilitated diffusion

Answer 8

types of passive transport that uses a protein to go from high to low
does not take energy