Transcript Core questions

1. Which of the following organic
molecules can never be used as a
source of energy?
a. Carbohydrates
b. Lipids
c. proteins
d. nucleic acids
Nucleic acids
d. Nucleic acids
2. Match the following organic
molecules to the appropriate
structures.
Carbohydrate
Lipid
Protein
3. Which statement is correct regarding acids and
bases?
A. Acids increase the pH and bases decrease the pH.
B. Acids release hydrogen (H+) ions [or hydronium
(H3O+) ions] and bases release hydroxide (OH-) ions.
C. Acids are harmful but bases are not harmful.
D. Acids combine with bases to form sugars.
B. Acids release hydrogen (H+) ions
[or hydronium (H3O+) ions] and
bases release hydroxide (OH-) ions.
4. Which of the following is NOT a main
component of living cells?
a. Aluminum
b. Hydrogen
c. Carbon
d. Nitrogen
a. Aluminum
5. Which word association is NOT
correct?
a. Nucleic acid – DNA
b. Carbohydrate – steroid
c. Lipid – long-term energy storage
d. Protein – enzyme
b. Carbohydrate – steroid
6. Proteins are a major part of every living cell
and have many different functions within each
cell. Carbohydrates also perform numerous roles
in living things.
Part 1. Describe how the structures of proteins
differ from the structures of carbohydrates.
Part II. Describe how the functions of proteins
and carbohydrates differ.
Part 1. Describe how the structures of proteins differ from the
structures of carbohydrates.
Proteins are made from repeating subunits called amino acids (which
contain nitrogen), which are connected together by peptide bonds.
Carbohydrates are generally ringed or long chained structures that
always has a general formula of CH2O.
Part II. Describe how the functions of proteins and
carbohydrates differ.
Carbohydrates generally are used as an energy source for
living organisms. Proteins are the structural material of
the body. They make up muscles and bones. They also
serve as chemical receptors and enzymes in living things
8. In the picture below, is one of many water molecules that would be found in a
beaker of water.
***Hand-draw picture***
Part I. Draw 3 additional water molecules surrounding the one given. Each
molecule drawn must be properly oriented to the molecule given.
Part II. Draw a box around 1 possible hydrogen bond in the above diagram.
Part III. Draw a box around a covalent bond in the above diagram.
Part IV. Label the partial charges on both hydrogens and the oxygen on one
molecule.
9. Match the monomer to the appropriate polymer. Write
the letter of the monomers beside the corresponding
polymer.
A. Amino acid
B. Monosaccharide
C. Fatty acid & glycerol
D. Nucleotide
Lipid ___
Carbohydrate ___
Nucleic acids ___
Proteins ___
A. Amino acid
B. Monosaccharide
C. Fatty acid & glycerol
D. Nucleotide
Lipid ___C
Carbohydrate ___B
Nucleic acids ___D
Proteins ___A
10. Compounds are formed when
a. atoms of an element lose an electron.
b. atoms of an element gain an electron.
c. atoms of the same element join together.
d. atoms of two different elements join
together.
d. atoms of two different
elements join together.
11. What allows you to fill a glass of water above the
rim without the water spilling over the edge?
a. Cohesion of water molecules.
b. Breaking of the ionic bonding of water.
c. Balance between H+ and OH- ions.
d. The vibrational movements of water molecules.
a. Cohesion of water
molecules.