TEAS 7 SCIENCE EXAM MASTERY 2026
2027 EDITION 200 ADVANCED
SCENARIOS WITH DETAILED CORRECT
ANSWERS WITH RATIONALES CORRECT
VERIFIED ANSWERS INSTANT
DOWNLOAD | 100% PASS GUARANTEE
Question 1: A medical student is studying the circulatory system and
tracing the exact path of a drop of blood as it travels from the systemic
circulation back to the systemic circulation. The student notes that the
blood must pass through the pulmonary circuit to become oxygenated.
Which of the following correctly sequences the chambers and major
vessels the blood passes through, starting from the vena cava? A) Right
atrium, right ventricle, pulmonary vein, lungs, pulmonary artery, left
atrium, left ventricle, aorta B) Right atrium, right ventricle, pulmonary
artery, lungs, pulmonary vein, left atrium, left ventricle, aorta C) Left
atrium, left ventricle, pulmonary artery, lungs, pulmonary vein, right
atrium, right ventricle, aorta D) Right atrium, right ventricle, aorta,
lungs, pulmonary vein, left atrium, left ventricle, pulmonary artery
Correct Answer: B Rationale: Deoxygenated blood from the body enters
the right atrium via the superior and inferior vena cava. It then flows
into the right ventricle, which pumps it through the pulmonary artery
to the lungs for gas exchange. Oxygenated blood returns to the left
atrium via the pulmonary veins, flows into the left ventricle, and is
pumped out to the body through the aorta.
Question 2: During a strenuous marathon, a runner's muscles begin to
produce lactic acid, causing a drop in the pH of the blood. The body
immediately initiates a compensatory mechanism to maintain
homeostasis. Which of the following best describes the physiological
response to this acid-base imbalance? A) The respiratory rate decreases
to retain carbon dioxide and increase blood pH. B) The kidneys
immediately excrete excess hydrogen ions and reabsorb bicarbonate. C)
The respiratory rate increases to blow off excess carbon dioxide, thereby
raising the blood pH. D) The heart rate decreases to reduce the delivery
of lactic acid to the bloodstream. Correct Answer: C Rationale: When
,blood pH drops (becomes more acidic) due to lactic acid buildup,
chemoreceptors detect the change and signal the respiratory center in
the brainstem. The respiratory rate and depth increase
(hyperventilation) to exhale more carbon dioxide. Since CO2 acts as an
acid in the blood (forming carbonic acid), blowing it off helps raise the
blood pH back toward the normal range. The kidneys also compensate,
but this takes hours to days, not immediately.
Question 3: A neurologist is examining a patient who has suffered a
stroke in the occipital lobe of the brain. Based on the functional
specialization of the cerebral cortex, which of the following deficits is the
patient most likely to exhibit? A) Inability to formulate coherent speech
and understand language. B) Loss of voluntary motor control on the
contralateral side of the body. C) Impaired vision, visual processing, and
recognition of objects. D) Deficits in decision-making, personality, and
complex problem-solving. Correct Answer: C Rationale: The occipital
lobe is primarily responsible for processing visual information.
Damage to this area typically results in visual deficits, such as cortical
blindness or difficulty recognizing objects. Broca's and Wernicke's
areas (speech/language) are in the frontal and temporal lobes,
respectively. Motor control is governed by the frontal lobe (primary
motor cortex), and decision-making/personality are also frontal lobe
functions.
Question 4: A researcher is designing an experiment to test the effect of a
new fertilizer on the growth rate of tomato plants. The researcher applies
the fertilizer to one group of plants and gives the other group only water.
Both groups are placed in the same greenhouse with identical light,
temperature, and soil conditions. In this experimental design, what is
the independent variable? A) The growth rate of the tomato plants. B)
The amount of water given to both groups. C) The application of the new
fertilizer. D) The temperature and light conditions in the greenhouse.
Correct Answer: C Rationale: The independent variable is the factor
that the experimenter deliberately manipulates or changes to observe
its effect. In this case, the application of the new fertilizer is what is
being manipulated. The growth rate is the dependent variable (what is
measured), while water, light, temperature, and soil are controlled
variables (constants) kept the same to ensure a fair test.
Question 5: A patient is diagnosed with a condition where the beta cells
of the pancreas are completely destroyed by an autoimmune response.
As a result of this destruction, which of the following metabolic processes
,will be directly impaired? A) The conversion of glycogen to glucose in the
liver. B) The cellular uptake of glucose from the bloodstream. C) The
secretion of glucagon in response to low blood sugar. D) The breakdown
of fatty acids into ketone bodies. Correct Answer: B Rationale: The beta
cells of the pancreatic islets are responsible for producing and secreting
insulin. Insulin's primary role is to facilitate the cellular uptake of
glucose from the bloodstream into tissues like muscle and fat. Without
insulin (as in Type 1 diabetes), glucose cannot enter the cells efficiently,
leading to hyperglycemia. Alpha cells secrete glucagon, which is
unaffected by beta cell destruction.
Question 6: In the process of protein synthesis, a specific organelle is
responsible for reading the mRNA transcript and assembling amino
acids into a polypeptide chain. After initial synthesis, this chain is often
folded and modified before being packaged into vesicles for transport out
of the cell. Which sequence of organelles correctly represents this
pathway? A) Nucleus, Smooth Endoplasmic Reticulum, Golgi Apparatus,
Lysosome B) Ribosome, Rough Endoplasmic Reticulum, Golgi
Apparatus, Cell Membrane C) Mitochondria, Rough Endoplasmic
Reticulum, Nucleus, Cell Membrane D) Ribosome, Smooth Endoplasmic
Reticulum, Lysosome, Cell Membrane Correct Answer: B Rationale:
Protein synthesis begins at the ribosome, which translates the mRNA
into a polypeptide. If the protein is destined for secretion or the
membrane, the ribosome attaches to the Rough Endoplasmic Reticulum
(RER), where the protein is folded and modified. It is then transported
in vesicles to the Golgi Apparatus for further processing, sorting, and
packaging, which finally sends it to the cell membrane for exocytosis.
Question 7: A biologist is studying a population of beetles where green
coloration is dominant (G) and brown coloration is recessive (g). If a
heterozygous green beetle (Gg) is crossed with a homozygous recessive
brown beetle (gg), what is the expected phenotypic ratio of their
offspring? A) 100% green B) 3 green : 1 brown C) 1 green : 1 brown D)
100% brown Correct Answer: C Rationale: This is a test cross between a
heterozygote (Gg) and a homozygous recessive (gg). The Gg parent can
produce G and g gametes, while the gg parent can only produce g
gametes. The resulting offspring genotypes will be 50% Gg (green) and
50% gg (brown), yielding a 1:1 phenotypic ratio.
Question 8: During a heavy infection, a specific type of white blood cell is
observed engulfing and digesting pathogenic bacteria through a process
called phagocytosis. Which of the following cells is primarily responsible
, for this first line of cellular defense? A) T lymphocytes B) B lymphocytes
C) Macrophages D) Eosinophils Correct Answer: C Rationale:
Macrophages (along with neutrophils) are professional phagocytes
that play a crucial role in the innate immune system by engulfing and
destroying pathogens. T and B lymphocytes are part of the adaptive
immune system and do not primarily function through phagocytosis.
Eosinophils are mainly involved in combating parasitic infections and
mediating allergic responses.
Question 9: A student is observing a cell under a microscope and notes
that it has a large central vacuole, a rigid cell wall made of cellulose, and
chloroplasts. Based on these structural characteristics, the student
correctly concludes that the cell is a: A) Prokaryotic bacterial cell B)
Fungal cell C) Plant cell D) Animal cell Correct Answer: C Rationale:
The presence of a large central vacuole, a cellulose cell wall, and
chloroplasts are the defining characteristics of plant cells. Fungal cells
have cell walls, but they are made of chitin, not cellulose, and they lack
chloroplasts. Bacterial cells are prokaryotic and lack membrane-bound
organelles like chloroplasts and large vacuoles. Animal cells lack cell
walls, chloroplasts, and large central vacuoles.
Question 10: The human body maintains a constant internal
temperature of approximately 98.6°F (37°C). When the body
temperature rises above this set point, blood vessels near the surface of
the skin dilate, and sweat glands become active. This mechanism is an
example of which of the following? A) Positive feedback loop B) Negative
feedback loop C) Feedforward mechanism D) Homeopathic regulation
Correct Answer: B Rationale: A negative feedback loop reverses a
change in a physiological variable, returning it to its set point. When
body temperature rises, vasodilation and sweating dissipate heat,
lowering the temperature back to normal. A positive feedback loop
would amplify the initial change (e.g., oxytocin release during
childbirth).
Question 11: In the nephron of the kidney, the majority of water, glucose,
and amino acids are reabsorbed from the filtrate back into the
bloodstream. In which specific segment of the nephron does this bulk
reabsorption primarily occur? A) Distal convoluted tubule B) Loop of
Henle C) Proximal convoluted tubule D) Collecting duct Correct Answer:
C Rationale: The proximal convoluted tubule (PCT) is responsible for
the reabsorption of approximately 65% of water, sodium, and chloride,
as well as nearly 100% of glucose, amino acids, and bicarbonate from
2027 EDITION 200 ADVANCED
SCENARIOS WITH DETAILED CORRECT
ANSWERS WITH RATIONALES CORRECT
VERIFIED ANSWERS INSTANT
DOWNLOAD | 100% PASS GUARANTEE
Question 1: A medical student is studying the circulatory system and
tracing the exact path of a drop of blood as it travels from the systemic
circulation back to the systemic circulation. The student notes that the
blood must pass through the pulmonary circuit to become oxygenated.
Which of the following correctly sequences the chambers and major
vessels the blood passes through, starting from the vena cava? A) Right
atrium, right ventricle, pulmonary vein, lungs, pulmonary artery, left
atrium, left ventricle, aorta B) Right atrium, right ventricle, pulmonary
artery, lungs, pulmonary vein, left atrium, left ventricle, aorta C) Left
atrium, left ventricle, pulmonary artery, lungs, pulmonary vein, right
atrium, right ventricle, aorta D) Right atrium, right ventricle, aorta,
lungs, pulmonary vein, left atrium, left ventricle, pulmonary artery
Correct Answer: B Rationale: Deoxygenated blood from the body enters
the right atrium via the superior and inferior vena cava. It then flows
into the right ventricle, which pumps it through the pulmonary artery
to the lungs for gas exchange. Oxygenated blood returns to the left
atrium via the pulmonary veins, flows into the left ventricle, and is
pumped out to the body through the aorta.
Question 2: During a strenuous marathon, a runner's muscles begin to
produce lactic acid, causing a drop in the pH of the blood. The body
immediately initiates a compensatory mechanism to maintain
homeostasis. Which of the following best describes the physiological
response to this acid-base imbalance? A) The respiratory rate decreases
to retain carbon dioxide and increase blood pH. B) The kidneys
immediately excrete excess hydrogen ions and reabsorb bicarbonate. C)
The respiratory rate increases to blow off excess carbon dioxide, thereby
raising the blood pH. D) The heart rate decreases to reduce the delivery
of lactic acid to the bloodstream. Correct Answer: C Rationale: When
,blood pH drops (becomes more acidic) due to lactic acid buildup,
chemoreceptors detect the change and signal the respiratory center in
the brainstem. The respiratory rate and depth increase
(hyperventilation) to exhale more carbon dioxide. Since CO2 acts as an
acid in the blood (forming carbonic acid), blowing it off helps raise the
blood pH back toward the normal range. The kidneys also compensate,
but this takes hours to days, not immediately.
Question 3: A neurologist is examining a patient who has suffered a
stroke in the occipital lobe of the brain. Based on the functional
specialization of the cerebral cortex, which of the following deficits is the
patient most likely to exhibit? A) Inability to formulate coherent speech
and understand language. B) Loss of voluntary motor control on the
contralateral side of the body. C) Impaired vision, visual processing, and
recognition of objects. D) Deficits in decision-making, personality, and
complex problem-solving. Correct Answer: C Rationale: The occipital
lobe is primarily responsible for processing visual information.
Damage to this area typically results in visual deficits, such as cortical
blindness or difficulty recognizing objects. Broca's and Wernicke's
areas (speech/language) are in the frontal and temporal lobes,
respectively. Motor control is governed by the frontal lobe (primary
motor cortex), and decision-making/personality are also frontal lobe
functions.
Question 4: A researcher is designing an experiment to test the effect of a
new fertilizer on the growth rate of tomato plants. The researcher applies
the fertilizer to one group of plants and gives the other group only water.
Both groups are placed in the same greenhouse with identical light,
temperature, and soil conditions. In this experimental design, what is
the independent variable? A) The growth rate of the tomato plants. B)
The amount of water given to both groups. C) The application of the new
fertilizer. D) The temperature and light conditions in the greenhouse.
Correct Answer: C Rationale: The independent variable is the factor
that the experimenter deliberately manipulates or changes to observe
its effect. In this case, the application of the new fertilizer is what is
being manipulated. The growth rate is the dependent variable (what is
measured), while water, light, temperature, and soil are controlled
variables (constants) kept the same to ensure a fair test.
Question 5: A patient is diagnosed with a condition where the beta cells
of the pancreas are completely destroyed by an autoimmune response.
As a result of this destruction, which of the following metabolic processes
,will be directly impaired? A) The conversion of glycogen to glucose in the
liver. B) The cellular uptake of glucose from the bloodstream. C) The
secretion of glucagon in response to low blood sugar. D) The breakdown
of fatty acids into ketone bodies. Correct Answer: B Rationale: The beta
cells of the pancreatic islets are responsible for producing and secreting
insulin. Insulin's primary role is to facilitate the cellular uptake of
glucose from the bloodstream into tissues like muscle and fat. Without
insulin (as in Type 1 diabetes), glucose cannot enter the cells efficiently,
leading to hyperglycemia. Alpha cells secrete glucagon, which is
unaffected by beta cell destruction.
Question 6: In the process of protein synthesis, a specific organelle is
responsible for reading the mRNA transcript and assembling amino
acids into a polypeptide chain. After initial synthesis, this chain is often
folded and modified before being packaged into vesicles for transport out
of the cell. Which sequence of organelles correctly represents this
pathway? A) Nucleus, Smooth Endoplasmic Reticulum, Golgi Apparatus,
Lysosome B) Ribosome, Rough Endoplasmic Reticulum, Golgi
Apparatus, Cell Membrane C) Mitochondria, Rough Endoplasmic
Reticulum, Nucleus, Cell Membrane D) Ribosome, Smooth Endoplasmic
Reticulum, Lysosome, Cell Membrane Correct Answer: B Rationale:
Protein synthesis begins at the ribosome, which translates the mRNA
into a polypeptide. If the protein is destined for secretion or the
membrane, the ribosome attaches to the Rough Endoplasmic Reticulum
(RER), where the protein is folded and modified. It is then transported
in vesicles to the Golgi Apparatus for further processing, sorting, and
packaging, which finally sends it to the cell membrane for exocytosis.
Question 7: A biologist is studying a population of beetles where green
coloration is dominant (G) and brown coloration is recessive (g). If a
heterozygous green beetle (Gg) is crossed with a homozygous recessive
brown beetle (gg), what is the expected phenotypic ratio of their
offspring? A) 100% green B) 3 green : 1 brown C) 1 green : 1 brown D)
100% brown Correct Answer: C Rationale: This is a test cross between a
heterozygote (Gg) and a homozygous recessive (gg). The Gg parent can
produce G and g gametes, while the gg parent can only produce g
gametes. The resulting offspring genotypes will be 50% Gg (green) and
50% gg (brown), yielding a 1:1 phenotypic ratio.
Question 8: During a heavy infection, a specific type of white blood cell is
observed engulfing and digesting pathogenic bacteria through a process
called phagocytosis. Which of the following cells is primarily responsible
, for this first line of cellular defense? A) T lymphocytes B) B lymphocytes
C) Macrophages D) Eosinophils Correct Answer: C Rationale:
Macrophages (along with neutrophils) are professional phagocytes
that play a crucial role in the innate immune system by engulfing and
destroying pathogens. T and B lymphocytes are part of the adaptive
immune system and do not primarily function through phagocytosis.
Eosinophils are mainly involved in combating parasitic infections and
mediating allergic responses.
Question 9: A student is observing a cell under a microscope and notes
that it has a large central vacuole, a rigid cell wall made of cellulose, and
chloroplasts. Based on these structural characteristics, the student
correctly concludes that the cell is a: A) Prokaryotic bacterial cell B)
Fungal cell C) Plant cell D) Animal cell Correct Answer: C Rationale:
The presence of a large central vacuole, a cellulose cell wall, and
chloroplasts are the defining characteristics of plant cells. Fungal cells
have cell walls, but they are made of chitin, not cellulose, and they lack
chloroplasts. Bacterial cells are prokaryotic and lack membrane-bound
organelles like chloroplasts and large vacuoles. Animal cells lack cell
walls, chloroplasts, and large central vacuoles.
Question 10: The human body maintains a constant internal
temperature of approximately 98.6°F (37°C). When the body
temperature rises above this set point, blood vessels near the surface of
the skin dilate, and sweat glands become active. This mechanism is an
example of which of the following? A) Positive feedback loop B) Negative
feedback loop C) Feedforward mechanism D) Homeopathic regulation
Correct Answer: B Rationale: A negative feedback loop reverses a
change in a physiological variable, returning it to its set point. When
body temperature rises, vasodilation and sweating dissipate heat,
lowering the temperature back to normal. A positive feedback loop
would amplify the initial change (e.g., oxytocin release during
childbirth).
Question 11: In the nephron of the kidney, the majority of water, glucose,
and amino acids are reabsorbed from the filtrate back into the
bloodstream. In which specific segment of the nephron does this bulk
reabsorption primarily occur? A) Distal convoluted tubule B) Loop of
Henle C) Proximal convoluted tubule D) Collecting duct Correct Answer:
C Rationale: The proximal convoluted tubule (PCT) is responsible for
the reabsorption of approximately 65% of water, sodium, and chloride,
as well as nearly 100% of glucose, amino acids, and bicarbonate from
