HESI Science A2 Exam Testbank With Answers (50 Solved Questions)

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Section III – Science1. Electricity is a general term encompassing a variety of phenomena resulting from thepresence and flow of electric charge. Which of the following statements about electricityis/are true?a. Electrically charged matter is influenced by, and produces, electromagnetic fields.b. Electric current is a movement or flow of electrically charged particles.c. Electric potential is a fundamental interaction between the magnetic field and the presenceand motion of an electric charge.d. An influence produced by an electric charge on other charges in its vicinity is an electric field.2. Which of the following is/are not included in Ohm’s Law?a. Ohm’s Law defines the relationships between (P) power, (E) voltage, (I) current, and (R)resistance.b. One ohm is the resistance value through which one volt will maintain a current of oneampere.c. Using Ohm’s Law, voltage is determined using V = IR, with I equaling current and R equalingresistance.

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d. An ohm (Ω) is a unit of electrical voltage.3. The property of a conductor that restricts its internal flow of electrons is:a. Frictionb. Powerc. Currentd. Resistance4. In physics, ____________ is the force that opposes the relative motion of two bodiesin contact.a. Resistanceb. Abrasivenessc. Frictiond. Antagonism5. What is the difference, of any, between kinetic energy and potential energy?a. Kinetic energy is the energy of a body that results from heat while potential energy is theenergy possessed by an object that is chilledb. Kinetic energy is the energy of a body that results from motion while potential energy is theenergy possessed by an object by virtue of its position or state, e.g., as in a compressedspring.c. There is no difference between kinetic and potential energy; all energy is the same.d. Potential energy is the energy of a body that results from motion while kinetic energy is theenergy possessed by an object by virtue of its position or state, e.g., as in a compressedspring.6. What are considered the four fundamental forces of nature?a. Gravity, electromagnetic force, weak nuclear force, and strong nuclear forceb. Gravity, electromagnetic force, negative nuclear force, and positive nuclear forcec. Polarity, electromagnetic force, weak nuclear force, and strong nuclear forced. Gravity, chemical magnetic force, weak nuclear force, and strong nuclear force7. Starting with the weakest, arrange the fundamental forces of nature in order ofstrength.a. Gravity, Weak Nuclear Force, Electromagnetic Force, Strong Nuclear Forceb. Weak Nuclear Force, Gravity, Electromagnetic Force, Strong Nuclear Forcec. Strong Nuclear Force, Weak Nuclear Force, Electromagnetic Force, Gravityd. Gravity, Strong Nuclear Force, Weak Nuclear Force, Electromagnetic Force8. What is the difference between Strong Nuclear Force and Weak Nuclear Force?a. The Strong Nuclear Force is an attractive force that binds protons and neutrons andmaintains the structure of the nucleus, and the Weak Nuclear Force is responsible for the

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radioactive beta decay and other subatomic reactions.b. The Strong Nuclear Force is responsible for the radioactive beta decay and other subatomicreactions, and the Weak Nuclear Force is an attractive force that binds protons and neutronsand maintains the structure of the nucleus.c. The Weak Nuclear Force is feeble and the Strong Nuclear Force is robust.d. The Strong Nuclear Force is a negative force that releases protons and neutrons andthreatens the structure of the nucleus, and the Weak Nuclear Force is an attractive force thatbinds protons and neutrons and maintains the structure of the nucleus.9. The Law of Conservation of Mass states that:a. No detectable gain but, depending on the substances used, some loss can occur in chemicalreactions.b. No detectable gain or loss occurs in chemical reactions.c. No detectable loss but some gain occurs in chemical reactions.d. Depending on the substances used, substantial gain or loss can occur in chemical reactions.10. What is the difference, if any, between convection and heat radiation?a. Thermal radiation is the transfer of heat from one place to another by the movement offluids; convection is electromagnetic radiation emitted from all matter due to its possessingthermal energy.b. Convection is the transfer of heat from one place to another by the movement of fluids;thermal radiation is nuclear energy emitted from all matter due to its possessing thermalenergy.c. Convection is the transfer of heat from one place to another by the movement of fluids;thermal radiation is electromagnetic radiation emitted from all matter due to its possessingthermal energy.d. Convection is the transfer of heat from one place to another by the movement of fluids;thermal radiation is the barely detectable light emitted from all matter due to its possessingthermal energy.11. In ________ cells, the cell cycle is the cycle of events involving cell division,including ______, ________, and _________.a. Prokaryotic, meiosis, cytokinesis, and interphaseb. Eukaryotic, meiosis, cytokinesis, and interphasec. Eukaryotic, mitosis, kinematisis, and interphased. Eukaryotic, mitosis, cytokinesis, and interphase12. Which, if any, of the following statements about prokaryotic cells is false?a. Prokaryotic cells include such organisms as E. coli and Streptococcus.b. Prokaryotic cells lack internal membranes and organelles.c. Prokaryotic cells break down food using cellular respiration and fermentation.d. All of these statements are true.

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13. __________ is a nucleic acid that carries the genetic information in the cell and iscapable of self-replication.a. RNAb. Triglyceridec. DNAd. DAR14. The complementary bases found in DNA are ______ and _______ or _______ and________.a. Adenine and thymine or cytosine and guanineb. Cytosine and thymine or adenine and guaninec. Adenine and cytosine or thymine and guanined. None of the above15. A/an ________ is the basic structural unit of nucleic acids (DNA or RNA); theirsequence determines individual hereditary characteristics.a. Geneb. Nucleotidec. Phosphated. Nitrogen base16. _________________ is a ______________ that plays an important role in the creationof new _________.a. Deoxyribonucleic acid (DNA) is a chain of nucleotides that plays an important role in thecreation of new proteins.b. Ribonucleic acid (RNA) is a chain of nucleotides that plays an important role in the creation ofnew proteins.c. Ribonucleic acid (RNA) is a cluster of enzymes that plays an important role in the creation ofnew proteins.d. Ribonucleic acid (RNA) is a chain of nucleotides that plays an important role in the creation ofnew genes.17. Which, if any, of the following statements are false?a. A mutation is a permanent change in the DNA sequence of a gene.b. Mutations in a gene’s DNA sequence can alter the amino acid sequence of the proteinencoded by the gene.c. Mutations in DNA sequences usually occur spontaneously.d. Mutations in DNA sequences are caused by exposure to environmental agents such assunshine.18. _______ reactions occur in every cell and use _______ to convert glucose toenergy; _______organisms such as many bacteria can release energy without theuse of ________.

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