HESI A2 BIOLOGY QUESTIONS AND ANSWERS
kingdom
largest and most inclusive category
species
most restrictive category
hierarchic organizational system
kingdom, phylum, class, order, family, genius, species
steps to an experiment
1. observation
2. hypothesis
3. experiment
...
HESI A2 BIOLOGY QUESTIONS AND ANSWERS
kingdom
largest and most inclusive category
species
most restrictive category
hierarchic organizational system
kingdom, phylum, class, order, family, genius, species
steps to an experiment
1. observation
2. hypothesis
3. experiment
4. conclusion
observation
data is observed and recorded/ previous data is studied
hypothesis
a statement or explanation of certain events or happenings
experiment
repeatable procedure of gathering data to support or refute the hypothesis
conclusion
where the data and its significance are fully explained
aqueous
water based
water molecule consists of
two hydrogen atoms covalently bonded to one oxygen atom
most significant aspect of water is
the polarity of its bonds that allows for hydrogen bonding between molecules
, specific heat
the amount of heat necessary to raise the temperature of 1 gram of that molecule 1 degree celsius
water has high specific heat due to
the extent of hydrogen bonding between water molecules, which allows waters to resist shifts in
temperature (ability of oceans or large bodies of water to stabilize climates)
cohesion
the ability of a molecule to stay bonded or attracted to another molecule of the same substance
(water running together on a newly waxed car)
adhesion
the ability of water to bond to or attract other molecules or substances (when water is sprayed onto
the wall, some of it sticks to the wall)
when water freezes it forms
lattice crystals; causing the molecules to spread apart, resulting in the phenomenon of ice floating
polarity of water allows it to act as an
versatile solvent (used to dissolve a number of different solvents)
carbohydrates
longs chains, or polymers of sugar
-used for storage, structure, and energy
-the backbone of important molecules such as DNA and RNA
lipids
known as fats, but specifically they are fatty acids, phospholipids, and steroids
fatty acids
Vary greatly but simply are grouped into two categories: saturated and unsaturated
saturated fats
contain no double bonds in their hydrogen tail
-solids at room temp
-lead to cardiovascular problems associated with diets
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