HESI A2 BIOLOGY COMPLETE 200 QUESTIONS AND VERIFIED ANSWERS |GURANTEED PASS|GRADED A+|INSTANT DOWNLOAD

HESI A2 BIOLOGY COMPLETE 200
QUESTIONS AND VERIFIED ANSWERS
|GURANTEED PASS|GRADED A+|INSTANT
DOWNLOAD



BIOLOGICAL MOLECULES & WATER
1. Why is polarity the most important characteristic of water?

 A) The results of polarity are hydrogen bonding, a high specific heat value, and its
versatile solvent properties
 B) The results of polarity are covalent bonding, a low specific heat value, and its versatile
solvent properties
 C) The results of polarity are ionic bonding, a high specific heat value, and its versatile
solvent properties
 D) The results of polarity are hydrogen bonding, a low specific heat value, and its
versatile solvent properties

Answer: A — Water's polarity leads to hydrogen bonding, gives water a high specific
heat value (allowing it to resist temperature changes), and makes water a versatile
solvent. These properties are essential for biological systems .

2. Which of the following is a benefit of the intermolecular hydrogen bonding of
water? (Select all that apply.)

 A) Water has a relatively high specific heat value
 B) Water has strong cohesive and adhesive properties
 C) Polarity of water allows it to act as a versatile solvent
 D) Water moves from higher to lower concentrations

Answer: A, B, C — Hydrogen bonding gives water high specific heat, cohesive/adhesive
properties, and solvent capabilities .

3. Which of the following categories is found in the highest concentration in the
human body?

, A) Nucleic acids
 B) Lipids
 C) Carbohydrates
 D) Proteins

Answer: D — Proteins are found in the highest concentration in the body based on
percent of body weight calculations. They are essential for structure, function, and
regulation of tissues and organs .

4. Of all the molecules significant to biology, which are considered the most
important?

 A) Carbohydrates, lipids, proteins, and nucleic acids
 B) Carbohydrates, lipids, proteins, and calcium
 C) Carbohydrates, lipids, proteins, and sulfur
 D) Carbohydrates, lipids, proteins, and iron

Answer: A — The four major biological macromolecules are carbohydrates, lipids,
proteins, and nucleic acids .

5. How are lipids different from other organic molecules?

 A) They are indivisible
 B) They are not water soluble
 C) They contain zinc
 D) They form long proteins

Answer: B — Lipids are hydrophobic (not water soluble) due to their nonpolar nature .

6. Lipids are better known as fats, but what are they specifically? (Select all that
apply.)

 A) Fatty acids
 B) Phospholipids
 C) Ketones
 D) Steroids

Answer: A, B, D — Lipids include fatty acids, phospholipids, and steroids. Ketones are
not lipids .

7. What are the two categories of fatty acids?

 A) Trans fat and saturated fats

, B) Trans fat and unsaturated fats
 C) Saturated fats and unsaturated fats
 D) Saturated fats and polyunsaturated fats

Answer: C — Fatty acids are classified as either saturated or unsaturated .

8. How do phospholipids function in cells?

 A) They are integral components of the nuclear membrane
 B) They are integral components of the cytoplasmic skeleton
 C) They are integral components of the mitochondrial membranes
 D) They are integral components of the plasma membrane

Answer: D — Phospholipids are integral components of the plasma membrane, forming
the phospholipid bilayer .

9. How many different types of amino acids can be found in biological proteins?

 A) 3
 B) 4
 C) 20
 D) 64

Answer: C — There are 20 different amino acids found in biological proteins .

10. A molecule of water is bonded with another molecule of water by what type of
bond?

 A) Ionic
 B) Covalent
 C) Hydrogen
 D) Molecular

Answer: C — Water molecules are bonded to each other by hydrogen bonds .




CELL STRUCTURE & FUNCTION
11. What is the fundamental unit of biology?

,  A) Atom
 B) Cell
 C) Tissue
 D) Organ

Answer: B — The cell is the basic unit of life, the smallest structure capable of
performing all life processes .

12. Which type of cell contains no defined nucleus?

 A) Prokaryotic cell
 B) Eukaryotic cell
 C) Animal cell
 D) Protist cell

Answer: A — Prokaryotic cells lack a true nucleus and membrane-bound organelles .

13. What is the primary purpose of the flagella on the surface of cells?

 A) Movement of the cell
 B) Removal of cellular waste
 C) Replication of chromosomes
 D) Production of energy

Answer: A — Flagella are used for cell movement .

14. Which cell organelle functions to transport materials from the endoplasmic
reticulum throughout the cell?

 A) Ribosome
 B) Golgi apparatus
 C) Lysosome
 D) Vacuole

Answer: B — The Golgi apparatus modifies, sorts, and packages proteins for transport
from the ER to their destinations .

15. Which organelle is responsible for protein synthesis in a cell?

 A) Mitochondrion
 B) Ribosome
 C) Golgi apparatus
 D) Nucleus