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Quiz Session - Attempts With Random Questions

HESI A2 Exam Questions

Page 9 of 74

161.

How many moles are contained in 0.455 L of a 7.182 M solution?

  • 3.268 moles

  • 0.063 moles

  • 15.785 moles

  • 63.353 moles

Correct answer: 3.268 moles

You would find the number of moles by using the molarity formula: molarity = moles of solute / liter of solution. Thus, 0.455 L × (7.182 M / 1.0 L) = 3.268 moles.

162.

Which of the following skull bones contains the foramen magnum which allows for the connection of the brain to the spinal cord?

  • Occipital bone

  • Parietal bones

  • Ethmoid bone

  • Sphenoid bone

Correct answer: Occipital bone

Unpaired Skull Bones

  1. Sphenoid bone: This is an unpaired skull bone that helps to make up part of the orbit of the eye and houses the pituitary gland.
  2. Ethmoid bone: This is an unpaired skull bone that makes up one part of the orbit of the eye, separates the nasal cavity from the brain and is the bone located deepest within the head. It differs from the other bones in the cranium in that it is a spongy bone opposed to a hard bone.
  3. Frontal bone: This is an unpaired skull bone at the very front of the skull that helps to make up the forehead and the orbit of the eye.
  4. Occipital bone: This is an unpaired skull bone at the back and bottom of the skull that contains a large oval hole (called the foramen magnum), which allows for the connection of the brain to the spinal cord.

Paired Skull Bones

  1. Temporal bones: This is a paired set of skull bones located on either side of the head that encase the middle and inner ear. The temporal bones are crucial in the anatomy of the ear.
  2. Parietal bones: This is a paired set of skull bones that form the roof of and part of the sides of the skull. Each parietal bone is shaped roughly like a curved rectangle.

163.

The snow has been falling for five straight days.

What part of speech is the word "falling" in the above sentence?

  • Verb

  • Noun

  • Preposition

  • Adjective

Correct answer: Verb

The word "falling" is a verb. A verb is a word that expresses action or a state of being.

The word "snow" is a noun. The word "for" is a preposition. The word "straight" is an adjective.

164.

Which type of solution combines readily separate matter?

  • Emulsions

  • Compounds

  • Alloys

  • Amalgams

Correct answer: Emulsions

Emulsions are solutions that combine readily separate matter. An example of an emulsion is water and oil, as these two types of matter readily separate.

Compounds are solutions that create a single matter by mixing different elements. Alloys are solutions that make a new type of metal by combining solid solutions of other metals. Amalgams are solutions that use mercury to dissolve another metal type.

165.

Wendy and Robin cut a total of 156 heads of hair this week. If Wendy cut 14 more heads of hair than Robin did, how many heads of hair did Robin cut?

  • 71

  • 48

  • 14

  • 64

Correct answer: 71

To solve this problem, start by setting it up as an algebraic equation:

(x + 14) + x = 156

1. Simplify brackets

x+14+x=156

2. Simplify x+14+x to 2x+14

2x+14=156

3. Subtract 14 from both sides

2x=156−14

4. Simplify 156−14 to 142

2x=142

5. Divide both sides by 2

x=142/2

6. Simplify 142/2 to 71

x=71

166.

To be heedless is to be _______.

  • thoughtless

  • careful

  • intelligent

  • energetic

Correct answer: thoughtless

To be heedless is to be thoughtless. The word heedless is defined as one who is careless, thoughtless, or unmindful.

167.

Solve for b:

2b + 3a = 21

2a = 6

  • 6

  • 3

  • 8

  • 9

Correct answer: 6

Rewrite the linear equations as a matrix.

Input Matrix:

3 2 21
2 0 6

Row Reduction:

2 0 6
0 2 12

 

2 0 6
0 1 6

Output Matrix:

1 0 3
0 1 6

Therefore:

a = 3

b = 6

168.

Dendrites transmit nerve impulses ______ the cell body.

  • Toward

  • Away from

  • Within

  • Above

Correct answer: Toward

Dendrites transmit nerve impulses toward the cell body.

A typical neuron contains a cell body, dendrites, and an axon.

Axons transmit a nerve impulse away from a cell body. The other answer choices are incorrect because dendrites transmit nerve impulses toward the cell body, not within the cell body or above the cell body.

169.

Read the following sentence, and select the meaning of the italicized word.

Since the patient's blood pressure was labile, the physician prescribed the patient a blood pressure medicine to help regulate it.

  • Rapidly changing

  • Possibly harmful

  • Worsening

  • Difficult to arouse

Correct answer: Rapidly changing

The term "labile" means rapidly changing. Since the patient's blood pressure was rapidly changing, the physician prescribed the patient a blood pressure medicine to help regulate it.

The term "adverse" means possibly harmful. The term "deteriorating" means worsening. The term "lethargic" means difficult to arouse.

170.

Find the value of x by solving the following proportion.

x:10 = 14:20

  • 7

  • 3

  • 20

  • 15

Correct answer: 7

1. Rewrite the proportion as a fraction

x/10 = 14/20

2. Simplify 14/20 to 7/10

x/10 = 7/10

3. Multiply both sides by 10

x = 7

171.

Add the fractions:

(1/6) + (7/8)

  • 25/24

  • 21/24

  • 2/7

  • 5/6

Correct answer: 25/24

1. Simplify brackets

1/6 + 7/8

2. Find the Least Common Denominator (LCD) of 1/6,7/8

Method 1: By Listing Multiples - List out all multiples of each denominator, and find the first common one.

6 : 6,12,18,24

8 : 8,16,24

Therefore, the LCD is 24

Method 2: By Prime Factors - List all prime factors of each denominator, and find the union of these primes.

6 : 2,3

8 : 2,2,2

Therefore, the LCD is 2 × 2 × 2 × 3 = 24

3. Make the denominators the same as the LCD

(1×4)/(6×4) + (7×3)/(8×3)

4. Simplify - Denominators are now the same

4/24 + 21/24

5. Join the denominators

(4+21)/24

6. Simplify

25/24

172.

Which of the following sentences contains an epithet?

  • The Rainmaker struck again and brought in fat year-end bonuses.

  • Joseph Grimmond was the best photographer the firm had ever know.

  • The South Americans are generally quite friendly. 

  • We didn't even earn enough this year to feed the fish in our saltwater tanks.

Correct answer: The Rainmaker struck again and brought in fat year-end bonuses.

An epithet is a term in place of a name. In the options below, only "Rainmaker" is used in place of someone's name.

Joseph Grimmond is an actual name, not an epithet. South Americans refer to a culture of people, their appropriate moniker, and is not an epithet. "We didn't even earn enough this year to feed the fish in our saltwater tanks" is a sentence that contains no names or epithets.

173.

Subtract the fractions:

28 1/2 - 12 1/4

  • 16 1/4

  • 16 1/2

  • 16 3/4

  • 16 1/8

Correct answer: 16 1/4

1. Convert 28 1/2 to improper fraction

Use this rule: a b/c = (ac+b)/c

(28×2+1)/2 − 12 1/4

2. Simplify 28×2 to 56

(56+1)/2 − 12 1/4

3. Simplify 56+1 to 57

57/2 − 12 1/4

4. Convert 12 1/4 to improper fraction

Use this rule: a b/c = (ac+b)/c

57/2 − (12×4+1)/4

5. Simplify 12×4 to 48

57/2 − (48+1)/4

6. Simplify 48+1 to 49

57/2 − 49/4

7. Find the Least Common Denominator (LCD) of 57/2,49/4

Method 1: By Listing Multiples - List out all multiples of each denominator, and find the first common one.

2 : 2,4

4 : 4

Therefore, the LCD is 4

Method 2: By Prime Factors - List all prime factors of each denominator, and find the union of these primes.

2 : 2

4 : 2,2

Therefore, the LCD is 2 × 2 = 4

8. Make the denominators the same as the LCD

57×2)/(2×2) − 49/4

9. Simplify - Denominators are now the same

114/4 − 49/4

10. Join the denominators

(114−49)/4

11. Simplify

65/4

12. Convert to mixed fraction

16 1/4

174.

What is the function of ribosomes in the cell?

  • Read RNA in the nucleus and translate the genetic instructions to produce proteins

  • Transport proteins from the endoplasmic reticulum (ER) throughout the cell

  • Contain the DNA of the cell in organized masses called chromosomes

  • Produce energy for the cell by making adenosine triphosphate (ATP)

Correct answer: Read RNA in the nucleus and translate the genetic instructions to produce proteins

Ribosomes are the organelles that read RNA produced in the nucleus and translate instructions in order to produce proteins. Cells with a high rate of protein synthesis generally have a larger number of ribosomes. Bound ribosomes can be found in the endoplasmic reticulum (ER) and free ribosomes can be found in the cytoplasm. The two types are interchangeable and have identical structures although they have slightly different roles.

The Golgi apparatus is an organelle that packages, processes, and transports proteins from the endoplasmic reticulum (ER) throughout the cell.

The nucleus contains the DNA of the cell in organized masses called chromosomes. Chromosomes contain all the genetic information for the regeneration (repair and replication) of the cell, as well as instructions for the function of the cell. Every organism has a number of chromosomes specific to the particular species.

Mitochondria are found in most eukaryotic cells and are the site of cellular respiration. They are responsible for making adenosine triphosphate (ATP), the cell's main energy-carrying molecule. Mitochondria contain their own ribosomes and DNA.

175.

The radius and ulna are two bones found in which of the following locations?

  • Forearm

  • Upper arm

  • Lower leg

  • Foot

Correct answer: Forearm

The radius and ulna are two bones found in the forearm. The ulna and the humerus form a hinge joint at the elbow, and the radius allows the hand and the forearm to turn over.

The upper arm contains the humerus. The lower leg contains the tibia and fibula. The foot contains the tarsals.

176.

The center part of an atom is the nucleus. What is the nucleus composed of?

  • Protons and neutrons

  • Protons and orbits

  • Electrons and neutrons

  • Electrons and orbits

Correct answer: Protons and neutrons

The atom’s nucleus is composed of protons and neutrons. An atom is the basic building block of a molecule.

An atom’s physical structure consists of the nucleus and orbits. The orbits of electrons are at the outermost part of the atom, and they spin around the nucleus.    

177.

Which of the following best describes an electron?

  • A negatively charged particle in an atom

  • A substance made up of atoms of more than one element

  • A unit used for measuring the mass of atoms

  • An atom that has an equal number of protons

Correct answer: A negatively charged particle in an atom

Electrons are the negatively charged particles in an atom.

A compound is a substance made up of atoms of more than one element. An atomic mass unit is a unit used for measuring the mass of atoms. Isotopes are atoms that have an equal number of protons.

178.

Select the option that correctly identifies the sentence's simple predicate.

One enormous snake measured nearly 30 feet long.

  • measured

  • enormous

  • nearly

  • One

Correct answer: measured

A predicate contains the sentence's verb, or the part of the sentence that shows action or says something in regard to the subject. The predicate "measured" is a simple predicate, as it is a verb without modifiers.

The word "enormous" is an adjective. The word "nearly" is an adverb. The word "One" is an adjective.

179.

In DNA, the nucleotide base adenine always binds with which of the following?

  • Thymine

  • Cytosine

  • Guanine

  • Uracil

Correct answer: Thymine

DNA is a long molecule that contains our unique genetic code. It holds the instructions for making all the proteins in our bodies. DNA is a double helical structure that contains the four nitrogenous bases: adenine, thymine, guanine, and cytosine. Each base forms hydrogen bonds with another base on the complementary strand. The bases have a precise bonding pattern. Adenine bonds with thymine and guanine bonds with cytosine (remember: AT/GC). Because of this method of bonding, the strands can be replicated, producing identical stands of DNA.

When the information stored in our DNA is converted into instructions for making proteins or other molecules, it is called gene expression. Gene expression is a regulated process that allows a cell to respond to its changing environment. It acts as both an on/off switch to control when proteins are made and also a volume control that increases or decreases the amount of proteins made. There are two key steps involved in making a protein: transcription and translation.

180.

After reading this passage, all except which of the following would be inferred by the reader?

  • Hair loss occurs the same in mice as it does in humans

  • Hair implant surgery is not favored by some individuals who have lost their hair

  • Hair restoration has been a focus of study for some researches in the past

  • Stem cell use has the potential to expand in the future

Correct answer: Hair loss occurs the same in mice as it does in humans

The passage does not infer that hair loss occurs the same in mice as it does in humans. The passage simply states that a hair restoration study was conducted on mice; it does not imply that the study was conducted on mice because they also lose their hair. An inference is similar to determining if a statement is true or false; however, it requires the reader to take an educated guess based on the given facts.

The passage does infer that hair implant surgery is not favored by some, as the second paragraph states: “…people who have lost their hair and want to avoid hair transplant surgery…”. The passage does infer that stem cell use has the potential to expand in the future because the passage states: “Stem cells have been a hot topic of discussion of late and there has been much talk that they may hold the future in medical science.” The passage does infer that hair restoration has been a focus of study for some researches in the past because the passage states: “Similar studies are being held in the field of hair care and some success has been had in recent times.”

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