ATI TEAS Practice Test A Questions WITH
CORRECT ANSWERS
Which of the following options represents the chromosomal composition of a normal
human zygote?
A. 23 chromosomes
B. 46 chromosomes
C. 69 chromosomes
D. 96 chromosomes - CORRECT ANSWES -- B. 46 chromosomes
The fusion of a sperm with 23 chromosomes and an egg with 23 chromosomes would
result in a zygote with 46 chromosomes.
Which of the following cell types provides a waterproofing function for the outer layers of
skin?
A. Melanocytes
B. Keratinocytes
C. Merkel cells
D. Langerhans cells - CORRECT ANSWES -- B. Keratinocytes
Keratinocytes contain the protein keratin. They are produced in the epidermis and
migrate upwards. The tight junctions between cells prevent water entry. They eventually
form a layer of dead cells on the skin surface, which produces a waterproofing effect.
A person is suddenly frightened. Which of the following reactions occurs next?
A. Liver cells absorb glucose from the blood stream.
B. Blood vessels supplying skeletal muscles constrict.
C. Blood vessels supplying the intestines dilate.
D. Liver cells release glucose into the blood stream. - CORRECT ANSWES -- D. Liver
cells release glucose into the blood stream.
Epinephrine causes liver cells to break down glycogen, which causes an increase in
sugar in the blood stream.
Kidneys remove which of the following from the blood?
A. Platelets
B. Salts
, C. Oxygen
D. Fat - CORRECT ANSWES -- B. Salts
Salts are removed by the kidneys.
Which of the following structures within a human cell is responsible for recycling the
materials no longer functional or needed within the cell?
A. Ribosome
B. Lysosome
C. Mitochondrion
D. Nucleolus - CORRECT ANSWES -- B. Lysosome
Lysosomes are specialized vacuoles containing digestive enzymes.
Which of the following are sesamoid bones?
A. Phalanges
B. Patellae
C. Scapulae
D. Metatarsals - CORRECT ANSWES -- B. Patellae
Patellae are sesamoid bones, which develop in response to strain. Patellae are also
considered short bones.
Which of the following chemical compounds prevents the lungs from collapsing?
A. Mucus
B. Surfactant
C. Enzymes
D. Buffers - CORRECT ANSWES -- B. Surfactant
Surfactants are lipopolysaccharides that have a hydrophobic and hydrophilic layer. They
keep the lungs inflated.
The use of an electron would most benefit the study of
A. the structure of atoms.
B. the structure of cellular organelles.
C. the structure of skeletal joints.
D. chemical bones in molecules. - CORRECT ANSWES -- B. the structure of cellular
organelles
Electron microscopy has significantly improved the ability to see and understand the
workings of these organelles because electron wavelengths are short enough to resolve
CORRECT ANSWERS
Which of the following options represents the chromosomal composition of a normal
human zygote?
A. 23 chromosomes
B. 46 chromosomes
C. 69 chromosomes
D. 96 chromosomes - CORRECT ANSWES -- B. 46 chromosomes
The fusion of a sperm with 23 chromosomes and an egg with 23 chromosomes would
result in a zygote with 46 chromosomes.
Which of the following cell types provides a waterproofing function for the outer layers of
skin?
A. Melanocytes
B. Keratinocytes
C. Merkel cells
D. Langerhans cells - CORRECT ANSWES -- B. Keratinocytes
Keratinocytes contain the protein keratin. They are produced in the epidermis and
migrate upwards. The tight junctions between cells prevent water entry. They eventually
form a layer of dead cells on the skin surface, which produces a waterproofing effect.
A person is suddenly frightened. Which of the following reactions occurs next?
A. Liver cells absorb glucose from the blood stream.
B. Blood vessels supplying skeletal muscles constrict.
C. Blood vessels supplying the intestines dilate.
D. Liver cells release glucose into the blood stream. - CORRECT ANSWES -- D. Liver
cells release glucose into the blood stream.
Epinephrine causes liver cells to break down glycogen, which causes an increase in
sugar in the blood stream.
Kidneys remove which of the following from the blood?
A. Platelets
B. Salts
, C. Oxygen
D. Fat - CORRECT ANSWES -- B. Salts
Salts are removed by the kidneys.
Which of the following structures within a human cell is responsible for recycling the
materials no longer functional or needed within the cell?
A. Ribosome
B. Lysosome
C. Mitochondrion
D. Nucleolus - CORRECT ANSWES -- B. Lysosome
Lysosomes are specialized vacuoles containing digestive enzymes.
Which of the following are sesamoid bones?
A. Phalanges
B. Patellae
C. Scapulae
D. Metatarsals - CORRECT ANSWES -- B. Patellae
Patellae are sesamoid bones, which develop in response to strain. Patellae are also
considered short bones.
Which of the following chemical compounds prevents the lungs from collapsing?
A. Mucus
B. Surfactant
C. Enzymes
D. Buffers - CORRECT ANSWES -- B. Surfactant
Surfactants are lipopolysaccharides that have a hydrophobic and hydrophilic layer. They
keep the lungs inflated.
The use of an electron would most benefit the study of
A. the structure of atoms.
B. the structure of cellular organelles.
C. the structure of skeletal joints.
D. chemical bones in molecules. - CORRECT ANSWES -- B. the structure of cellular
organelles
Electron microscopy has significantly improved the ability to see and understand the
workings of these organelles because electron wavelengths are short enough to resolve
