HESI A2 Biology | Questions, Answers & Study Guide | 2026/2027

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HESI A2 BIOLOGY
HESI A2 BIOLOGY
Study online at https://quizlet.com/_49048d

1. kingdom largest and most inclusive category

2. species most restrictive category

3. hierarchic organi- kingdom, phylum, class, order, family, genius, species
zational system

4. steps to an exper- 1. observation
iment 2. hypothesis
3. experiment
4. conclusion

5. observation data is observed and recorded/ previous data is studied

6. hypothesis a statement or explanation of certain events or happenings

7. experiment repeatable procedure of gathering data to support or refute the hypothesis

8. conclusion where the data and its significance are fully explained

9. aqueous water based

10. water molecule two hydrogen atoms covalently bonded to one oxygen atom
consists of

11. most significant the polarity of its bonds that allows for hydrogen bonding between molecules
aspect of water is

12. specific heat the amount of heat necessary to raise the temperature of 1 gram of that molecule
1 degree celsius

13. water has high the extent of hydrogen bonding between water molecules, which allows waters to
specific heat due resist shifts in temperature (ability of oceans or large bodies of water to stabilize
to climates)


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HESI A2 BIOLOGY
HESI A2 BIOLOGY
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14. 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)

15. 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)

16. when water lattice crystals; causing the molecules to spread apart, resulting in the phenome-
freezes it forms non of ice floating

17. polarity of water versatile solvent (used to dissolve a number of different solvents)
allows it to act as
an

18. carbohydrates longs chains, or polymers of sugar
-used for storage, structure, and energy
-the backbone of important molecules such as DNA and RNA

19. lipids known as fats, but specifically they are fatty acids, phospholipids, and steroids

20. fatty acids Vary greatly but simply are grouped into two categories: saturated and unsaturated

21. saturated fats contain no double bonds in their hydrogen tail
-solids at room temp
-lead to cardiovascular problems associated with diets

22. unsaturated fats have one or more double bonds
-liquid at room temperature

23. phospholipids -consist of two fatty acids of varying length bonded to a phosphate group
-phosphate group is charged and therefore polar and soluble in water

24. steroids -component of membranes
-precursors to significant hormones and drugs



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