I'm Thirsty
What happens to water when it freezes? (Does it sink or float) This happens because of...
Floats; water's density
What are the monomers for:
1) carbohydrates
2) proteins
3) nucleotides
1) monosaccharides
2) amino acids
3) nucleic acids
Give two examples of an organism maintaining homeostasis.
Sweating, shivering, feeling hungry or thirsty, a fever when you are sick, etc.
Compare the rate of a reaction and the activation energy or a reaction.
Lowering the activation energy of a chemical reaction can increase the rate of that reaction.
Potatoes, pasta, starches
1) What type of bond connects oxygen and hydrogen atoms within a single water molecule?
2) What type of bond holds different water molecules together?
1) Covalent; 2) hydrogen
Carbohydrates and Lipids
What are the two examples of genetic code for all life?
DNA and RNA
1) Which group is used to test out hypothesis and has variables that are manipulated?
2) Which group is unchanged and used to compare against?
1) experimental group; 2) control group
What is the range of pH for an acid?
1-6
1) When water molecules stick together, what property of water is this?
2) When water molecules stick to other surfaces, what property of water is this?
2) Adhesion
What is the purpose of lipids?
What is the purpose of proteins?
They store energy.
They build muscles and bones.
Over millions of years, animals have changed to better suit their environments, such as snakes losing their legs or horses gradually getting taller. What characteristic of life does this represent?
Evolution
How can bias negatively affect an experiment?
It can lead you to conclude something that isn't necessarily true. Bias is a personal point of view for or against something.
What is a buffer?
It helps regulate the pH of a substance and can be used in living things to help maintain homeostasis.
Water is considered this ____________. (It has a positive end and a negative end due to bonding, and this is what gives water its unique characteristics.)
polar
Can enzymes work at any temperature?
They work best within a certain range of temperatures, not too hot and not too cold.
Many animals migrate during cold seasons to find warmer weather and more food or during dry seasons to find food. What characteristic of life does this represent?
Living things respond to stimuli (their environment)
Which type of reaction would happen faster: one with higher activation energy, or one with lower activation energy?
Lower activation energy
Individuals who don't have the lactase enzyme are unable to break down the sugar lactose found in milk. Which term best describes "lactase"?
Enzyme; protein; catalyst
What is it that scientists are testing in an experiment?
A hypothesis
Which variable is manipulated in an experiment, and how many of these types of variables can there be?
Independent variable; only one
All living things need to maintain a constant internal balance within their bodies. What is this characteristic of life called?
Which variable in an experiment is kept the same and not changed?
Constants (or control variables)
True of False: Catalysts can be used up in a chemical reaction.