TEAS Science Practice Test

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An unknown element is found to contain 45 protons and an atomic mass of 64, what is its atomic number?

Correct! Wrong!

The number of protons in an atom’s nucleus is also the atomic number of the atom. In this case, we are told that there are 45 protons present and that the atomic mass is 64; however, when looking for the atomic number, we do not need the atomic mass. Consequently, the atomic number is 45.

The square above is based on the eye color of two parents, one of whom has brown eyes and carries the recessive gene for green eyes (a). What is the probability that a biological child of these parents will have brown eyes?

Correct! Wrong!

In the Punnett Square pictured, two of the children have brown eyes(A) and carry the recessive green gene(a) = (Aa), while two of the children have green eyes (aa). There is a 50% chance these parents will produce offspring with brown eyes (Aa).

The spleen functions are part of the _____ system. Which of the following completes the sentence above?

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The spleen is part of the lymphatic system. Like the lymph nodes, it acts as a blood filter.

Which of the following is an example of deductive reasoning?

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Deductive reasoning starts with basic premises that are assumed to be correct, and draws a specific logical conclusion. It often follows the logic: A ➞ B, C ➞ A, therefore C ➞ B. (C) might be tempting, but is an example of inductive reasoning. (A) and (B) are logically flawed.

Which of the following is a possible cause of herniation of discs?

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Disc herniation occurs when the inner core of a disc in the spine leaks out through the outer portion of the disc. This type of spinal injury is usually caused by an injury to the back and/or spine. Whiplash suffered from a minor impact could potentially cause a herniated disc.

Which of the following is a characteristic of the autonomic nervous system?

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The somatic nervous system controls voluntary actions, while the autonomic nervous system functions primarily below the level of consciousness, to control functions such as digestion, heart rate, respiratory rate, perspiration, salivation, swallowing, and breathing. The central nervous system consists of the spinal cord and brain.

During photosynthesis, which two compounds are combined to create the output of glucose and oxygen?

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During photosynthesis, water and carbon dioxide are absorbed by the plant and converted to glucose and oxygen.

Which of the following is true about the frog?

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Since the frog is inside the triangle, and the key indicates the triangle represents amphibians, it is logical to conclude that the frog is a type of amphibian.

Which statement can be inferred about amphibians?

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While all the amphibians are located inside the “circle” of vertebrates, there is nothing to indicate that ALL vertebrates are amphibians.

What would this diagram be useful for?

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The chart is not specific to any particular disease. Since it starts with “exposure” and ends with three phrases that all use the word “transmission,” the diagram is logically used to determine whether exposure to disease will lead to disease transmission.

What type of bond between the complementary bases of DNA stabilizes the double helix structure?

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Hydrogen bonds form between the bases to stabilize the double helix structure of DNA.

Which of the following subatomic particles are found inside of an atom’s nucleus?

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While the entirety of an atom’s nucleus contains neutrons, protons, and electrons, only the neutrons and protons are found inside of the nucleus. Electrons exist as a cloud surrounding the nucleus and thus are not found inside it.

Which of the following statements is true regarding trophic levels?

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There is always a decrease in the amount of energy transferred from lower trophic levels to higher trophic levels. In general, the higher the trophic level of the consumer, the less overall available energy. Primary consumers have more energy available than both secondary and tertiary consumers.

Why does the human eye perceive a red colored dress as the color red?

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When light hits an object, the object absorbs some of the light and reflects the rest of it. The wavelengths that are reflected determine how our eye perceives the color. We see a red dress as “red” because those wavelengths are reflected and not absorbed.

In a lab experiment designed to test the rate at which plants grow under artificial light, the kind of light used is which type of variable?

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In an experiment, an “independent variable” is a factor controlled by the scientists. A "dependent variable" represents the output or effect. Since the light is controlled by the experimenters, it is an independent variable.

Which organ system is primarily responsible for regulating metabolism, mood, and growth?

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The endocrine system is the collection of glands that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep and mood, among other things. Also ‘Regulating’ is a big hint in this problem.

In a vacuum, why doesn’t an elephant accelerate faster than a penny as it falls to the ground?

Correct! Wrong!

More massive objects will only free-fall faster than smaller objects if there is a significant amount of air resistance present. For a penny and an elephant that are free-falling in a vacuum, the rate of acceleration would be the same, so both would fall at the acceleration due to gravity which is 9.8m/s2.

Which train described below would have the greatest momentum?

Correct! Wrong!

The momentum of an object is equal to the mass of the object times the velocity of the object. The largest momentum from these choices comes from 9500 x 200 = 1.9 million.

A scientist found that when an invasive species was introduced into a river, the population of salmon native to the region decreased. The type of correlation between these two populations could best be described as

Correct! Wrong!

When one factor affects a second factor, it can be said that the two have a strong correlation. Since the salmon population decreases as the invasive species population increases, these two factors have an inverse relationship.

The addition of a catalyst to a chemical reaction will have what effect?

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A catalyst, by definition, is an enzyme that helps decrease the energy necessary to begin a reaction. Consequently, the addition of a catalyst to a chemical reaction will increase the rate at which the reaction takes place. A reduction in the energy required to begin the reaction means that the reaction will take place more quickly.

The pharynx is part of what body system?

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The pharynx is part of two systems; the respiratory and the digestive. It is another name for the throat, which extends from the base of the skull to the level of the sixth cervical vertebra.

Which of the following is true about eukaryotic cells?

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Unlike prokaryotic cells, eukaryotic cells contain mitochrondria, a nucleus, lysosomes, and multiple chromosomes.

What characteristic of an element determines its specific isotope?

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The number of neutrons is what gives the element its specific isotope. The number of protons determines which element it is, while the number of electrons determines if the atomic particle has a positive, negative, or neutral charge.

What is NOT true about RNA?

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DNA is stable under alkaline conditions, while RNA is not stable (as RNA has an –OH instead of an H, as in DNA).

Which of the following scenarios would NOT give a normal distribution?

Correct! Wrong!

It is likely that as the percentage of toxic substances in an environment increases, the percentage of living organisms will decrease. This would be an inverse relationship and would not exhibit a normal distribution. The rest would show normal distribution.

In a cell, the Golgi apparatus is found in what location?

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The Golgi body, or simply the Golgi, is an organelle found inside the cytoplasm inside a cell. While it is close to other organelles, it is positioned independently on its own within the cytoplasm.

Which taxonomic rank is the next-smallest after Order?

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The taxonomy ranks run from largest to smallest: Kingdom, Phylum, Class, Order, Family, Genus, Species. The next-smallest after Order is Family. A useful mnemonic for remembering is, ‘King Philip Came Over For Great Spaghetti.’

In plants, ________ involves the formation of a _____?

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Cytokinesis happens after telophase and it is the splitting of one cell into two. In plants it involves the formation of a cell plate whereas in animals it involves the formation of a cleavage furrow.

Which base is NOT found in DNA?

Correct! Wrong!

The information in DNA is stored as four nucleotides: adenine (A), guanine (G), cytosine (C), and thymine (T). The nucleotides adenine and guanine are classified as purines, while thymine and cytosine are classified as pyrmidines. Purines contain 2 carbon nitrogen ring bases and pyrimidines contain 1 carbon nitrogen base. These nucleotides can be easily remembered with the mnemonic, ‘GCAT PuPy PuPy,’ where ‘G’ and ‘A’ match up with ‘Pu’ (purine) and ‘C’ and ‘T’ match up with ‘Py’ (pyrimidine). RNA replaces thymine with uracil (U) and can be recalled as ‘GCAU PuPy PuPy.’

Which of the following layers of the atmosphere is the closest to space?

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The thermosphere is the highest level of atmosphere before the exosphere, in which the atmosphere’s molecules drift into space.

Which is NOT one of the four basic types of tissue?

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The parenchyma of an organ consists of that tissue which conducts the specific function of the organ and comprises the bulk of the organ. It is not one of the four basic types of tissue: epithelial, nervous, connective, and muscle.

The stomach is _____ to the small intestine. Which of the following correctly completes the sentence above?

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The stomach is above the small intestine. The word “superior” in anatomy means “upper” or “above.”

Which of the following is the atomic mass of an atom containing 42 protons, 42 electrons, and 37 neutrons?

Correct! Wrong!

To calculate the atomic mass, we must sum the number of protons and the number of neutrons inside of the nucleus. The electron’s size is miniscule in comparison to both the proton and the neutron and as a result does not contribute to the mass of the atom. So, adding 42 protons with 37 neutrons results in an atomic mass of 79.

A patient who has suffered head trauma is not able to recognize people he has met around an hour earlier but is still able to recognize people he met before the injury. He most likely has damage to the:

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The hippocampus is the site of memory storage. The medulla oblongata is involved in involuntary controls, the corpus callosum is involved in connections between the two lobes and in emotions and the Pituitary gland is an endocrine organ..

What process is illustrated in the diagram above?

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Meiosis is a two-step process, and the four cells that result each have half the normal genetic material of the original cell.

Of the following, which is not a type of chemical bond?

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Ionic bonds involve the donation of and acceptance of electrons. Covalent bonds involve sharing electrons. Polar bonds describe electronegativity differences. Magnetic bonds are not chemical bonds.

If the amount of hydrogen in a balloon of fixed size is doubled, what happens to the mass and density of the balloon?

Correct! Wrong!

As the number of molecules of air increases in a given volume, the mass of air also increases. As the mass of air in the given volume increases, its density also increases.

If you have 200 mL of a 60% sodium chloride solution, how much NaCl is dissolved in the solution?

Correct! Wrong!

A 60% NaCl solution would be made by dissolving 60 g of NaCl in slightly less than 100 mL of water, and then increasing the volume of the solution to the final 100mL of water. If we had 200 mL of a 60% NaCl solution, then there would be 120 g of NaCl dissolved in the solution.

How many carbon dioxide molecules are required to balance the following reaction:

4C6H12O6 + 24O2 → _CO2 + 24H2O + Energy

Correct! Wrong!

For a chemical reaction to be balanced, the amount of reactants must be the same as the amount of products. As there are 24 total carbons in the reactants, there should also be 24 carbons in the products.

The graph above records the death rate of two types of male flies a certain number of days after a chemical pesticide is sprayed. What is the probability a male methuselah fly will be alive 75 days after exposure to the pesticide?

Correct! Wrong!

On the x-axis, 75 days corresponds to roughly 20% on the y-axis. Since about 20% of the methuselah flies survive after 75 days, the probability of one fly’s survival is 1/5.

A scientist wants to write an equation using the variables X, Y, and Z. What is the proper relationship between the variables if X represents time, Y represents energy, and Z represents power?

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Power is equal to energy divided by time.

What type of correlation is presented between price and quality?

Correct! Wrong!

Although the correlation is not strong, it appears that the price increases as the quality increases. This describes a weak direct correlation.

What type of cells result from mitosis?

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Mitosis produces two diploid daughter cells that have the same genetic material as the original mother cell.

Cheetahs, rainbow trout, and inchworms belong to the same

Correct! Wrong!

All three animals belong to the same kingdom of Animalia, but are too different to be classed in the same phylum. Cheetahs and rainbow trout are in the Chordata phylum, while inchworms are in Arthropoda phylum.

The presence of which hormone would NOT cause an increase in water retention?

Correct! Wrong!

ANP, or Atrial Natiuretic Peptide is a hormone released in response to increased blood volume and pressure that produces vasodilation. As a consequence of this vasodilation, the excretion of both sodium and water increases in order to return to the homeostatic conditions prior to increased blood volume and pressure. Because excretion of water increases, ANP causes a decrease in water retention and not an increase.

In which part of the heart does oxygenated blood flow out of?

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Oxygenated blood that leaves the heart is pumped from the left ventricle.

Which of the following hormones are secreted directly by the hypothalamus?

Correct! Wrong!

Dopamine is a neurotransmitter in the brain that plays vital roles in a variety of different behaviors.

Which of the following terms do these diagrams NOT portray?

Correct! Wrong!

The first one is active transport as it requires ATP and the other two are symporter and antiporter respectfully. They both require facilitated transport. The only one not shown is an ion channel which requires no energy besides a gradient and is not active transport as it uses no ATP.

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