BS 161 Exam 1

BS 161 Exam 1
Where do lipids, a class of organic compounds, fit on the hierarchy of biological
organization?
DNA
What are characteristics of an ionic bond?
An electron is completely pulled from one atom to another. The electronegativity
difference is always high between atoms of this bond type.
What are characteristics of a covalent bond?
Atoms of this bond might have equal electronegativities. This bond may also be polar or
nonpolar.
What are the 4 most common elements in living organisms?
Carbon, Oxygen, Hydrogen and Nitrogen
What elements are present in trace amounts only?
Iodine and Zinc
What elements are found in greater than trace amounts?
Sodium, Chloride, Calcium, phosphorus, potassium, sulfur, magnesium and iron
The atomic number of carbon-13 is ____
6
The atomic mass of carbon-13 is ______
13
C-12, C-13, and C-14 have the same number of protons but different numbers of
neutrons so they are ______.
Isotopes
Atoms have gained or lost electrons and are no longer electrically neutral are called
_____.
Ions
Describe a single covalent bond.
Holds a molecule of hydrogen together, involves 2 atoms sharing 2 electrons and two
chlorine atoms are held together by this bond.
Describe an Ionic bond.

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