Cell biology Flashcards
What is the cell membrane composed of
proteins and phospholipid molecules
What does a phospholipid molecule made up of
A phosphate head and a lipid tail
What molecules can pass through a selectively permeable membrane
Small molecules such as water and oxygen and carbon can pass through freely larger molecules like glucose must pass through proteins to enter and some molecules like starch too big to pass at all
What is diffusion
The movement of substances from a high concentration gradient to a low concentration gradient down a concentration gradient
What is osmosis
The movement of water molecules from a high water concentration to a lower water concentration through a selectively permeable membrane
When water is taken in to an animal cell by osmosis it ….
bursts
When water is taken out of an animal cell by osmosis it ….
Shrinks
When water is taken into a plant cell by osmosis it …
Becomes turgid
When water is taken out of a plant cell by osmosis it …
Plasmolyses
An example of active transport is
The sodium potassium pump
An animal cell has
Nucleus Cell membrane Cytoplasm Mitochondria Ribosomes
A plant cell has
Nucleus Cell membrane Cytoplasm Mitochondria Ribosomes Cell wall Vacuole Chloroplast
A fungal cell has
Nucleus Cell membrane Cytoplasm Mitochondria Ribosomes Cell wall vacuole
A bacterial cell has
Cell membrane Cytoplasm Ribosomes Cell wall Plasmids
What is the function of the nucleus
Controls cell activities and contains genetic material
