BIOLOGY CUMULATIVE EXAM QUESTIONS AND ANSWERS |100% PASS
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Course
Biology Cumulative
Institution
Biology Cumulative
BIOLOGY CUMULATIVE EXAM
QUESTIONS AND ANSWERS |100%
PASS
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 a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by ________. -
Answer✔✔-Polar covalent bonds
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 spend more time around the oxygen atom nucleus than
around the hydrogen atom nucleus
Sulfur is in the same column of the periodic table as oxygen, but has electronegativity similar to carbon.
Compared to water molecules, molecules of H2S will ________. - Answer✔✔-not form hydrogen bonds
with each other
Water molecules can form hydrogen bonds with ________. - Answer✔✔-compounds that have polar
covalent bonds
Cohesion, surface tension, and adhesion are the properties of water molecules that ________. -
Answer✔✔-are a result of hydrogen bonding
Liquid water ________. - Answer✔✔-has a heat of vaporization higher than that of most other
substances
The complexity and variety of organic molecules is due to ________. - Answer✔✔-the chemical
versatility of carbon atoms
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