BIOLOGY CUMULATIVE EXAM # 3 QUESTIONS AND CORRECT ANSWERS
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Course
BIOLOGY CUMULATIVE
Institution
BIOLOGY CUMULATIVE
BIOLOGY CUMULATIVE EXAM # 3 QUESTIONS AND CORRECT ANSWERS
About 25 of the 92 natural elements are known to be essential to life. Which 4 of these 25 elements make up approximately 96% of living matter? - ANSWER carbon, hydrogen, nitrogen, oxygen
Trace elements are those required by an o...
, About 25 of the 92 natural elements are known to be essential to life. Which 4 of
these 25 elements make up approximately 96% of living matter? - ANSWER
carbon, hydrogen, nitrogen, oxygen
Trace elements are those required by an organism in only minute quantities.
Which of the following is a trace element that is required by humans and other
A
vertebrates, but not by other organisms such as bacteria or plants? - ANSWER
iodine
VI
Which of the following statements is TRUE? - ANSWER Some naturally
occurring elements are toxic to organisms.
TU
Which of the following are compounds? - ANSWER H2O and CH4, but not
O2
IS
Atoms have no electric charge because they have ________. - ANSWER an
equal number of protons and electrons
M
An ion with six protons, seven neutrons, and a charge of 2+ has an atomic
number of ________. - ANSWER 6
O
Molybdenum has an atomic number of 42. Several common isotopes exist, with
mass numbers from 92-100. Which of the following can be true? - ANSWER
A
Molybdenum atoms can have between 50 and 58 neutrons.
N
In a single molecule of water, two hydrogen atoms are bonded to a single oxygen
atom by ________. - ANSWER Polar covalent bonds
JP
The partial negative charge at one end of a water molecule is attracted to the
partial positive charge of another water molecule. What is this attraction called? -
ANSWER a hydrogen bond
The partial negative charge in a molecule of water occurs because ________. -
ANSWER the electrons shared between the oxygen and hydrogen atoms
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