Glencoe Life iScience, Grade 7, Student Edition: Life science chapter Flashcards
Doesn’t require energy from the cell.
Some move by_______. They spread out from areas of high concentration to areas of low concentration.
The number of particles of a substance in a given volume.
Since the cell membrane is made up of a phospholipid by layer larger molecules or those that are polar Kimmel through special proteins in the cell membrane.
Water moving across the cell membrane.
Water will move from an area of ______ concentration to an area of ________concentration.
Requires energy from the cell to move materials through a membrane. This is usually moving substances from areas of lower to higher concentration.
Occurs when large bit of material is captured within a pocket in the membrane and then moved into the cell.
Needs to get rid of large materials. Example expelling proteins or hormones made by a cell.
A cell’a size is limited to its ___________ . This limitation occurs because materials need to be able to travel to all parts of the cell.
Surface area- to -volume ratio
When do cells use energy?
Making the products of the cell.
How do you get energy?
Take in food (lipid, carbohydrates)
Chemical respiration is a series of chemical reactions that convert the energy in food molecules into a usable form of energy called?
_______ occurs in cytoplasm.
-Breaks glucose into smaller particles, producing ATP.
_______ occurs in mitochondria.
-Produces large amounts of ATP
-Forms two waste products______ and _______.
carbon dioxide and water
Alternate stage two:
- Releases energy from food when ______is not present.
-Produces ____ ATP then aerobic respiration.
States that all living things are made of one or more cells, the cell is the smallest unit of life, and all new cells come from precasting cells.
Form by joining many small molecules together.
Macromolecules hat form when long chains of molecules called nucleotides join together.
Long chains of amino acid molecules.
-Macromolecules necessary for nearly everything cells do.
Large macromolecule that does not dissolve in water.
One sugar molecule, two sugar molecules, or a long chain of sugar molecules make up a ______?
The ___ states that the cell is the basic unit of all living things.
Store energy, provide structural support, and are needed for communication between cells.
Which macromolecule is made from amino acids?
Flexible covering that protects the inside of a cell from the environment outside a cell.
Stiff structure outside the cell membrane, generally in plant cells.
Fluid inside a cell that contains salts and other molecules.
Network of threadlike proteins that are joined together.
Membrane surrounded component of a eukaryotic cell with specialized functions.
Pat of a eukaryotic cell that directs cell activity and contains genetic information stored in DNA.
A membrane bound organelle that uses light energy and makes food-a sugar called glucose- from water and carbon dioxide in a process known ass photosynthesis.
What is the difference between a cell wall and a cell membrane?
A cell wall helps to maintain shape and gives structural support.
Which organelle is used to store water?
What is the purpose of the cytoskeleton?
It provides the cell with an internal framework that gives it shape and helps it to move.
The movement of substances through a cell membrane without using the cell’s energy.
The movement of substances from an area of higher concentration to an area of lower concentration.
The diffusion of water molecules only through a membrane.
The process by which molecules pass through a cell membrane using special proteins called transport proteins.
The movement of substances through a cell membrane using the cell’s energy.
The process during which a cell takes in a substance by surrounding it with the cell membrane.
The process during which a cell’s vesicles release their contents outside the cell.
What is the difference between active and passive transport?
Active transport uses the cell’s energy and passive transport does not.
What is the process that a vesicles use to move a substance out of a cell?
Why is energy needed in active transport?
Substances move from an area of lower concentration to an area of higher concentration and this requires energy.
What is the difference between osmosis and diffusion?
Osmosis only occurs with water molecules, and diffusion is any substance that crosses a membrane.
What is limited b a cell’s surface-area-to-volume ratio?
A. Cell shape
B. Cell size
C. Cell surface area
D. Cell volume
A series of chemical reactions that convert the energy in food molecules into a usable form of energy called ATP.
A process by which glucose, a sugar, is broken down into smaller molecules.
A reaction that eukaryotic and prokaryotic cells can use to obtain energy from food when oxygen levels are low.
A series of chemical reactions that convert light energy, water, and carbon dioxide into the food energy molecule glucose and give off oxygen.
What is the difference between cellular respiration and fermentation?
Fermentation is used when oxygen levels are low.
Which contains pigments that contain light energy?