BS 161 EXAM 1 (ACTUAL EXAM) WITH
CORRECT 60+ ACTUAL QUESTIONS AND
CORRECTLY WELL DEFINED ANSWERS
LATEST 2024 ALREADY GRADED A+
Organelle: - ANSWERS-Is a specialized structure within which particular
cell processes occur
Endomembrane system: - ANSWERS-Weaves through the cell interior,
providing extensive surface area for many membrane-associated cell
processes to occur
What are characteristics of a covalent bond? - ANSWERS-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? -
ANSWERS-Carbon, Oxygen, Hydrogen and Nitrogen
,Where do lipids, a class of organic compounds, fit on the hierarchy of
biological organization? - ANSWERS-DNA
What are characteristics of an ionic bond? - ANSWERS-An electron is
completely pulled from one atom to another. The electronegativity
difference is always high between atoms of this bond type.
What elements are present in trace amounts only? - ANSWERS-Iodine
and Zinc
What elements are found in greater than trace amounts? - ANSWERS-
Sodium, Chloride, Calcium, phosphorus, potassium, sulfur, magnesium
and iron
The atomic number of carbon-13 is ____ - ANSWERS-6
The atomic mass of carbon-13 is ______ - ANSWERS-13
C-12, C-13, and C-14 have the same number of protons but different
numbers of neutrons so they are ______. - ANSWERS-Isotopes
,Atoms have gained or lost electrons and are no longer electrically
neutral are called _____. - ANSWERS-Ions
Describe a single covalent bond. - ANSWERS-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. - ANSWERS-Formed by an attraction between
atoms with opposite charges, bond that hold NaCl together, Involves a
transfer of one or more electrons from one atom to another, Leads to
the formation of a crystal lattice rather than distinct molecules and
Weakest type of bond shown.
Describe a double covalent bond. - ANSWERS-hold a molecule of
oxygen together, Involves 2 atoms sharing 4 electrons, strongest type
of bond shown and carbon dioxide is held together by this type of
bond.
T/F
A water molecule is held together by 2 single polar covalent bond -
ANSWERS-TRUE
T/F
, Because oxygen has a greater electronegativity than hydrogen, water
molecules are polar w/ 2 partial negative charges near the oxygen atom
and one partial positive charge near each hydrogen atom. - ANSWERS-
TRUE
T/F
Atoms differ in their affinity for neutrons, a property called
electronegativity. - ANSWERS-FALSE
T/F
In general, electronegativity increases from left to right across each row
of the periodic table and also increases down each column. - ANSWERS-
FALSE
T/F
In a nonpolar covalent bond there is an equal sharing of electrons
between two atoms while polar covalent bonds involve an unequal
sharing of electrons. - ANSWERS-TRUE
T/F
A single molecule of Oxygen is held together by 2 double non polar
covalent bonds. - ANSWERS-FALSE
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