South Carolina Biology EOC Review Questions
with Correct Answers
what two organelles are not in animal cells cell wall and chloroplast
homeostasis balanced internal condition of cells or maintain a relatively constant internal
environment even though the external environment is changing
describe the polar and non polar regions of the phospholipid layer polar heads are
hydrophilic "water loving"
non polar tails are hydrophobic "water fearing"
why is the cell membrane considered to be a bilipid layer it is made of two layers of
phospholipids
semipermeable or selectively permeable membrane will let certain things across but not
all things
,What will not go across the cell membrane large molecules such as proteins do not move
through the membrane on their own
what are the cell membrane components - phospholipids (peripheral and integral)
proteins
- cholesterol
- carbohydrates (glucose)
characteristics of simple diffusion - requires no energy (ATP)
- molecules move from area ***HIGH TO LOW*** concentration
osmosis diffusion of water across a membrane
What is classified as passive transport simple diffusion and facilitated diffusion
does simple and facilitated diffusion require energy? no
, does active transport require energy (ATP) yes
Materials move down their concentration gradient (high to low) in what kind of diffusion
simple diffusion
What kind of diffusion uses transport proteins to move high to low concentration
facilitated diffusion
Molecules move through a transport protein against their gradient (low to high) in what form of
transport active transport
The carrier proteins can change shape to move material in what transport active
transport
what is exocytosis molecules are moved out of the cell by vesicles that fuse with the
plasma membrane
with Correct Answers
what two organelles are not in animal cells cell wall and chloroplast
homeostasis balanced internal condition of cells or maintain a relatively constant internal
environment even though the external environment is changing
describe the polar and non polar regions of the phospholipid layer polar heads are
hydrophilic "water loving"
non polar tails are hydrophobic "water fearing"
why is the cell membrane considered to be a bilipid layer it is made of two layers of
phospholipids
semipermeable or selectively permeable membrane will let certain things across but not
all things
,What will not go across the cell membrane large molecules such as proteins do not move
through the membrane on their own
what are the cell membrane components - phospholipids (peripheral and integral)
proteins
- cholesterol
- carbohydrates (glucose)
characteristics of simple diffusion - requires no energy (ATP)
- molecules move from area ***HIGH TO LOW*** concentration
osmosis diffusion of water across a membrane
What is classified as passive transport simple diffusion and facilitated diffusion
does simple and facilitated diffusion require energy? no
, does active transport require energy (ATP) yes
Materials move down their concentration gradient (high to low) in what kind of diffusion
simple diffusion
What kind of diffusion uses transport proteins to move high to low concentration
facilitated diffusion
Molecules move through a transport protein against their gradient (low to high) in what form of
transport active transport
The carrier proteins can change shape to move material in what transport active
transport
what is exocytosis molecules are moved out of the cell by vesicles that fuse with the
plasma membrane
