Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Biology Chapter 2

Final Review

QuestionAnswer
Atom basic unit of matter
Nucleus center of atom - protons and neutrons
Proton positive
Neutron neutral
Electron negative and orbits the nucleus
Chemical element pure substance consisting of one type of atom
Isotopes same element different electron #
Isotopes are identified by... their mass numbers
Isotopes have the same chemical properties because... they have the same number of electrons
Chemical compound Substance formed by the chemical combination of two or more elements in definite proportions
Chemical bonds holds compounds together
Covalent bond electrons are shared
Ionic bond electrons are transferred
Molecule structure when atom are joined by covalent bonds
Van der Waals forces Slight attractions between oppositely charged regions of nearby molecules
Water is polar
Water is polar because... the oxygen pulls the electrons more than the hydrogen
Hydrogen bonds strongest bonds between molecules
Cohesion attraction between molecules of the same substance
Adhesion attraction between molecules of the different substance
Mixture Material with elements or compounds physically mixed but not chemically combined
Greatest solvent in the world water
Suspension water and nondisolved materials
Solute dissolved substance
Solvent substance in which the solute dissolves
Water's neutral because the number of hydroxide ions is equal to the number to the number of hydrogen ions.
pH scale indicates the number of hydrogen ions
The number of ions increases ____ times as you go down one on the pH scale 10 times
Acids pH below 7, H+ ions in water, more H+ ions than water
Bases alkaline, produces OH- ions, pH above 7, lower H+ than water
Carbon rules because it can bond to lots of stuff
Polymerization process by which macromolecules are formed
Polymers chains of monomers
4 groups of organic compounds carbohydrates, lipids, nucleic acids, proteins
Carbohydrates starches and sugars, main source of energy, stregnth and rigidity in plants and some animals
Monosaccharides single sugar molecules
Animals store excess sugar in glycogen
Plants store excess sugar in plant starch
Lipids made of carbon and hydrogen, fats oils and waxes, glycerol combines with fatty acids to make them, used as parts of biological membranes, to store energy, and as chemical messengers
Saturated all single bonds between carbon atoms
Unsaturated at least on carbon=carbon double bond
Polyunsaturated more than one double bond
Nucleic acids contain hydrogen, oxygen, nitrogen, carbon, phosphorous
Nucleotides monomers that make up neucleic acids
A nucleotide consists of five-carbon sugar, a phosphate group, a nitrogenous base
2 kinds of nucleic acids DNA and RNA
Proteins contain nitrogen, carbon, hydrogen, oxygen
Amino acids monomers that make protein
Proteins are used for controlling the rate of reactions and regulating cell processes (like enzymes), forming bones and muscles, transporting substances, and fighting diseases.
Chemical reaction process that changes one set of chemicals into another
Reactants enter a reaction
Products produced by a reaction
Chemical reactions involve changes in chemical bonds
Energy is always _____ in chemical reactions released or absorbed
Chemical reactions that absorb energy need a source of energy to occur
Activation energy the source of energy that gets a reaction started
Catalyst speeds up the rate of a reaction
Enzymes proteins that are biological catalysts
Cells use enzymes how? Speed up chemical reactions in cells
An enzyme gets its name from... the reaction it catylizes
Substrates reactants of enzyme-catalyzed reactions
The fit is very precise in the active site (blank)
Enzyme-substrate complex the binding together of an enzyme and a substrate forms it
Cells have proteins that can... turn enzymes on or off
Created by: numchuckskillz
Popular Biology sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards