What is an atom that has either lost or gained an electron and has an electral charge?
Ion
100
What numbers are considered a base on the pH scale?
7.1 to 14
100
Because water has a positive and a negative end, it is considered....
a) polar
b) unpolar
c) neutral
polar.
100
What two elements must be presents for a molecule to be considered organic?
Carbon and Hydrogen
100
Which of the four organic macromolecules makes up the cell membrane and is also used for long term energy storage?
Lipids
200
An atom of an element that has a different number of neutrons is an.....
Isotope
200
A solution with a pH of 13 is considered a:
a) strong base.
b) strong acid.
c ) weak base.
d) weak acid.
strong base.
200
Where will the hydrogen bond form between water molecules?
Between the positive end of one and the negative end of another.
200
What are the monomers that make up proteins?
Amino Acids
200
Which bond occurs when electrons are transferred?
an ionic bond
300
The combination of two or more atoms of different elements is known as a....
compound.
300
What type of solution has a higher number of H+(hydrogen ions) than OH- (hydroxide ions)?
a) acid
b) base
an acid.
300
Which property of water allows humans to maintain a constant body temperature?
High specific heat.
300
What are the monomers that make up nucleic acids?
Nucleotides
300
Keratin, elastin, colagen, peroxidase, and hemoglobin are all examples of which organic macromolecule?
Protein
400
Why do atoms bond?
To become stable
400
How does an acid become neutralized?
a) When it comes into contact with a base.
b) When it comes into contact with water.
c) When ti comes into contact with enzymes.
When it comes into contact with a base.
400
The property of water that enables it to dissolve and transport materials is...
It is a good solvent.
400
What element is found in nucleic acids that is not found in the other three organic macromolecules?
Phosphorous
400
Glucose, fructose, galactose, glycogen, cellulose, and chitin are all examples of which organic macromolecule?
Carbohydrates
500
Of the three bonds we have learned about, which is considered the strongest?
Ionic (Note: This bond occurs between metals and nonmetals.)
500
What does a buffer to do pH levels of a solution?
a) makes it more acidic
b) makes it more basic
c) prevents it from changing
Prevents it from changing.
500
Which of the three bonds that we have spoken about in class allows two water molecules to bond?
a) covalent
b) hydrogen
c) ionic
Hydrogen. (Note: This bond is also considered to be the weakest of the three.)
500
Which organic molecule is used as a primary source of energy and is also considered a structural component of plants and some animals?