Biology 7.0 Homeostasis deck Flashcards
What does the cytoskeleton do for the cell?
It forms a framework for the cell and is an anchor for organelles
What are microtubules?
long hollow protein cylinders that form a rigid skeleton for the cell and moves substances within the cell
Why do cells have certain shapes?
because Microfilaments give it its shape and helps the cell to move.
What stores DNA and RNA, as well as stores information to used to make proteins, that determine a cell’s growth and function?
A Nucleus
What organelles manuafacture/make proteins?
Ribosomes
What is a ball like structure inside of the nucleus that produces ribosomes?
Nucleolus
What does the Endoplasmic Reticulum do?
it’s a membrane system of folded sacs and interconnected channels that serve as a site for protein and lipid synthesis.
What are two types of endoplasmic reticulum?
rough(protein) and smooth(hormones and lipids)
What does the Golgi apparatus do?
it modifies, sorts and packages proteins.
What is the function of vesicles?
to fuse plasma membrane, and to release proteins into te environment.
What is a vacuole and where is it found?
A membrane bound sac used for temporary storage. It’s almost allways found in plant cells.
Define Lysosomes.
vesicles that contain substances that digest excess organelles and food particles.
When are centrioles made?
They are made from groups of microtubules that finction during cell division.
What is the function of the mitochondria?
to convert fuel particles into usable energy.
What is the function of chloroplasts?
capture light and convert it into chemical energy.
What is a cell wall and what is it made out of?
thick, rigid, mesh of fibers that surroun dthe outside of the cell, made of celulose
In active transport what does it cross and does it require energy or not?
It crosses the concentration gradient, and it requires energy
In a hypertonic solution, what happens to cells?
Animal cells shrivel up because the water moving in is lesser than coming out, the net movement of water is out of the cell.
How do plant cells and animals cells react differently to a hypotonic solution?
In a hypotonic solution, cells becme overflowed with an excess of water because more water is going in than coming out. An animal cell would burst completely in a hypotonic solution, but in a plant cell, the cell wall protects the cell from water but some water gets through, so the plant cell swells.
What are two statments about sodium-pottasium ATPase pump?
It’s found in the plasma membrane of cells and it maintains the level of sodium ions and pottasium ions inside and outside of the cell.
When changes happen in the environment of a cell, how do passive and active transports help the cell?
by moving materials across the cell membrane
together, the different types of transport allow a cell to interact with its environment while maintaining ____.
homeotasis
What is another name for carbohydrates attached to proteins?
Glycoproteins
Which is the model that describes the phospholipids in the bilayer as a “sea” in which other molecules can float?
Fluid Mosaic Model
