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TEAS 7 Science practice questions

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These are original practice items written to the TEAS 7 blueprint (4 options, no penalty for wrong answers), not actual exam questions. Try each one before you open the answer.

Practice by topic

Topics come from the tags on our own items, so this list reflects what the bank actually covers in Science rather than a generic syllabus.

Science - Human Anatomy and Physiology 33 in the bank Science: Biology 76 in the bank Science: Chemistry 66 in the bank Science: Scientific Reasoning 49 in the bank

Science sample questions

Question 1

A heterozygous tall pea plant (Tt) is crossed with a homozygous recessive short pea plant (tt). What percentage of the offspring is expected to be tall?

  1. A 50 percent
  2. B 25 percent
  3. C 100 percent
  4. D 75 percent
Show the answer and explanation

Correct answer: A

In Tt × tt, the tt parent always passes t and the Tt parent passes T or t equally, giving 1 Tt (tall) : 1 tt (short). So 50 percent are tall.

Why the other options are wrong:
B: 25 percent is the short fraction from a Tt × Tt cross.
C: 100 percent tall would require the tall parent to be TT.
D: 75 percent is the tall fraction from a Tt × Tt cross, not from a cross with a tt parent.

Question 2

A researcher compares two types of cells and finds that one contains a much greater number of mitochondria than the other. Which cellular activity is most likely elevated in the mitochondria rich cell?

  1. A DNA replication during the cell cycle
  2. B Breakdown of cellular waste by lysosomes
  3. C Protein synthesis on the rough endoplasmic reticulum
  4. D ATP production through cellular respiration
Show the answer and explanation

Correct answer: D

Mitochondria are the site of aerobic cellular respiration, which produces most of a cell's ATP. A cell packed with mitochondria, such as a muscle cell, has a high energy demand.

Why the other options are wrong:
A: Replication of the cell's genome happens in the nucleus during S phase and is not what extra mitochondria indicate.
B: Lysosomes, not mitochondria, break down cellular waste.
C: Protein synthesis occurs on ribosomes of the rough ER; a protein-secreting cell would show more rough ER, not more mitochondria.

Question 3

In pea plants, purple flower color (P) is dominant over white flower color (p). If two heterozygous purple-flowered plants (Pp) are crossed, what is the probability that an offspring will have white flowers?

  1. A 50%
  2. B 75%
  3. C 25%
  4. D 100%
Show the answer and explanation

Correct answer: C

A Pp × Pp cross gives 1 PP : 2 Pp : 1 pp. Only pp plants have white flowers, so the probability is 1 in 4, or 25%.

Why the other options are wrong:
A: 50% is the probability of a heterozygous Pp offspring, which has purple flowers.
B: 75% is the probability of purple flowers (PP plus Pp), the dominant phenotype.
D: 100% white would require both parents to be pp.

Question 4

A neuron releases a chemical messenger into the synaptic cleft so it can bind to receptors on an adjacent neuron. What is this chemical messenger called?

  1. A Antibody
  2. B Neurotransmitter
  3. C Hormone
  4. D Enzyme
Show the answer and explanation

Correct answer: B

A neurotransmitter is released from the axon terminal into the synaptic cleft, where it binds receptors on the next neuron and passes the signal along.

Why the other options are wrong:
A: Antibodies are immune proteins that bind antigens; they do not carry signals between neurons.
C: Hormones are released by endocrine glands into the bloodstream to reach distant targets, not into a synaptic cleft.
D: Enzymes speed up chemical reactions; some break down neurotransmitters, but they are not the messengers themselves.

Question 5

A solution with a pH of 3 has how many times the hydrogen ion concentration compared to a solution with a pH of 5?

  1. A 1000 times
  2. B 100 times
  3. C 2 times
  4. D 20 times
Show the answer and explanation

Correct answer: B

pH 3 means [H+] = 10^-3 M and pH 5 means [H+] = 10^-5 M. The ratio is 10^-3 ÷ 10^-5 = 10² = 100.

Why the other options are wrong:
A: 1000 times would require a 3-unit pH difference.
C: 2 times treats the pH scale as linear, using the difference of 2 directly.
D: 20 times multiplies the difference by 10 instead of raising 10 to that power.

Question 6

Which organelle serves as the primary site of ATP production through aerobic respiration in eukaryotic cells?

  1. A Golgi apparatus
  2. B Ribosome
  3. C Mitochondrion
  4. D Lysosome
Show the answer and explanation

Correct answer: C

The mitochondrion contains the enzymes needed for the citric acid cycle and the electron transport chain, which together generate most of a cell's ATP during aerobic respiration. Ribosomes synthesize proteins, the Golgi apparatus packages and ships proteins, and lysosomes break down waste materials.

Question 7

When blood calcium levels drop below normal, which hormone is released, and what is its primary effect on bone tissue?

  1. A Parathyroid hormone; stimulates osteoclast activity and raises blood calcium levels
  2. B Calcitonin; stimulates osteoclast activity and raises blood calcium levels
  3. C Calcitonin; inhibits osteoclast activity and lowers blood calcium levels
  4. D Parathyroid hormone; inhibits osteoclast activity and lowers blood calcium levels
Show the answer and explanation

Correct answer: A

Low blood calcium triggers the parathyroid glands to release parathyroid hormone (PTH), which increases osteoclast activity so bone releases calcium and blood calcium rises.

Why the other options are wrong:
B: Calcitonin inhibits osteoclasts rather than stimulating them, and it lowers blood calcium.
C: This describes calcitonin correctly, but calcitonin is released when blood calcium is high, not low.
D: PTH increases bone breakdown and raises blood calcium; it does not inhibit osteoclasts or lower calcium.

Question 8

Which blood component is primarily responsible for carrying oxygen from the lungs to the body tissues?

  1. A Red blood cells
  2. B Platelets
  3. C White blood cells
  4. D Plasma
Show the answer and explanation

Correct answer: A

Red blood cells contain hemoglobin, which binds oxygen in the lungs and releases it in the body tissues. They carry nearly all of the oxygen in blood.

Why the other options are wrong:
B: Platelets are cell fragments that help form clots to stop bleeding.
C: White blood cells defend the body against infection; they do not transport oxygen.
D: Plasma carries nutrients, hormones and proteins, but very little oxygen dissolves in it.

Question 9

A 2.0 kg object initially at rest is acted upon by a net force of 6.0 N. Using Newton's second law, what is the resulting acceleration of the object?

  1. A 0.33 m/s^2
  2. B 3.0 m/s^2
  3. C 12 m/s^2
  4. D 6.0 m/s^2
Show the answer and explanation

Correct answer: B

Newton's second law: a = F ÷ m = 6.0 N ÷ 2.0 kg = 3.0 m/s².

Why the other options are wrong:
A: 0.33 m/s² divides mass by force (2.0 ÷ 6.0), inverting the formula.
C: 12 m/s² multiplies force by mass instead of dividing.
D: 6.0 m/s² uses the force value alone and ignores the mass.

Question 10

A solution with a pH of 3 is best described as which of the following?

  1. A Strongly acidic
  2. B Weakly basic
  3. C Neutral
  4. D Weakly acidic
Show the answer and explanation

Correct answer: A

The pH scale ranges from 0 to 14, with lower numbers indicating greater acidity. A pH of 3 is far below 7 (neutral) and indicates a strongly acidic solution. Weak acids typically have pH values closer to neutral (e.g., pH 5 or 6), and bases have pH greater than 7.

Why the other options are wrong:
B: Basic solutions have pH above 7, not below.
C: Neutral pH is exactly 7, not 3.
D: A pH of 3 is considered strongly acidic, not weakly acidic.

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