Chapter 7 Flashcards
(27 cards)
What structures do plants cells have that animal cells do not? ( 3 parts)
Cell wall, vacuoles, chloroplast
What three things do all cells have?
DNA,membrane,cytoplasm
What is the function of the cell membrane? What is it like?
Controls what enters and leaves the cell. Protects/support cell.
The cell membrane is made of a double-layered called a?
Lipid bilayer
What is the function of the proteins attached to a cell membrane?
The proteins act as channels to move specific molecules through the cell.
In what organisms are cell walls found?
Plants
What is the main function of the cell wall?
Protect/support cell
What is diffusion?
Constant movement of molecules from an area of high concentration to am area of low concentration.
What does it mean that cell membranes are selectively permeable (semi-permeable)?
Certain materials can past
Osmosis is the diffusion of ……….. through a selectively permeable membrane.
Water
Water tends to diffuse from an area of ….. concentration to an area of … concentration
High, low
What is it called when a proteins helps something move in or out of cell?
Facilitated diffusion
What is it called when something requires energy to move from low to high concentration?
Active transport
T or F. Facilitated diffusion does not require the cell to use energy.
True
T or F. Active transport does require the cell to use energy.
True
Active transport moves material across a cell membrane against the concentration difference from an area of … Concentration to an area of …. Concentration
Low, high
What are the 3 parts of the cell theory?
All living things are composed of cells.
Cells are the basic units of structure and function in living things.
New cells are produced from existing cells.
What scientist looked at cork cells with a compound microscope?
Robert Hooke
The small dense region in the nucleus where the assembly of ribosomes begins is called the?
Nucleolus
Which organelles can use energy from sunlight to create energy-rich food molecules?
Chloroplast
The fourth and highest, level of organization in a multicellular organism is?
An organ system
The distinct,threadlike structures that contain the genetic information of the cell are called?
Chromosomes
Particles tend to move from an area of high concentration to an area of low concentration in a process know as?
Diffusion
When some substances can pass across them but others cannot, biological membranes are said to have ……. …………
Selective permeability
