HESI A2 BIOLOGY - BASICS, WATER, AND MOLECULES

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HESI A2 BIOLOGY - BASICS, WATER, AND MOLECULES

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -27 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Core theme of biology?

Answer:

Evolution

Question 2: Specific types of Lipids?

Answer:

Fatty Acids, Phospholipids, Steroids

Question 3: What is the largest of the biological molecules?

Answer:

Proteins.

Question 4: What are all the reactions of metabolism catalyzed by?

Answer:

Enzymes.

Question 5: Difference between saturated and unsaturated structurally?

Answer:

Saturated have no double bonds unsaturated have one or more double bonds.

Question 6: Structure of phospholipids?

Answer:

Two fatty acids and a phosphate group.

Question 7: What are nucleic acids?

Answer:

Components of the molecules of inheritance.

Question 8: Two categories of fatty acids?

Answer:

Saturated and unsaturated

Question 9: Hierarchic System of Organization?

Answer:

Kingdom, Phylum, Class, Order, Family, Genus, Species

Question 10: What is adhesion?

Answer:

Ability of water to bond to or attract other molecules or substances.

Question 11: What is RNA?

Answer:

Used in transfer and as a messenger of genetic code.

Question 12: What is DNA?

Answer:

Contains code that is necessary for replication.

Question 13: What is Metabolism?

Answer:

Sum of all chemical reactions that occur in an organism.

Question 14: What is a lattice?

Answer:

The spreading apart of molecules when they freeze. Causes the phenomenon of floating.

Question 15: What are enzymes?

Answer:

Particular proteins that act to catalyze different reactions.

Question 16: 4 most important molecules to biology?

Answer:

Carbohydrates, Lipids, Proteins, Nucleic Acids

Question 17: What are the most significant contributors to cellular function?

Answer:

Proteins

Question 18: Most significant aspect of water?

Answer:

The polarity of its bonds

Question 19: What allows for hydrogen bonding between molecules?

Answer:

Polar nature of water

Question 20: What is cohesion?

Answer:

Ability of a molecule to stay bonded or attracted to another molecule of the same substance.

Question 21: Importance of steroids?

Answer:

Precursor to many significant hormones.

Question 22: What is specific heat?

Answer:

Amount of heat necessary to the raise the temp. of 1 gram of that molecule by 1 degree celsius.

Question 23: Structure of Carbs?

Answer:

Long chains AKA polymers

Question 24: State of saturated fats and unsaturated fats at room temp?

Answer:

sat-Solid unsat- Liquid

Question 25: Most important purposes of Carbs?

Answer:

Storage, Structure, Energy

Question 26: What are amino acids?

Answer:

20 molecules creating a polymer called protein.

Question 27: Importance of the way phospholipids form?

Answer:

Create barrier to protect the cell.