Science Test 2-21-24 Flashcards
Elements
contains just one type of atom
Ex. cole and copper
Compounds
contains two or more different atoms
Ex. Wate, sugar, salt
Mixtures
Contains two or more different substances that are physically or chemically not combined
Ex. jellybeans
Carbohydrate
Ex. Sugar and starch
Lipid
fats, oils, and grease
Protein:
Amino Acids
Nucleic acid:
DNA and RNA
In order for it to be in one of the categories what does it have to have?
Carbon
How is water important to the function of cells? (3 things)
Most chemical reactions within cells could not take place without water
Helps cells keep size and shape
Helps keep the temperature of cells from changing rapidly
How do most small molecules cross the cell membrane?
Selectively permeable
Passive Transport:
movement of dissolved materials through a cell membrane without using cellular energy
Active transport:
movement of materials through a cell membrane using cellular energy
Selectively Permeable
only certain things can go in and out of the cell
What does it keep out
Keeps harmful materials out of the cell
Lets water, nutrients into the cell
Waste products leave the cell