TEAS Science Exam with All Questions from Actual Exam and 100% Correct Answers Updated, Exams of Nursing

Download TEAS Science Exam with All Questions from Actual Exam and 100% Correct Answers Updated and more Exams Nursing in PDF only on Docsity! TEAS Science Exam with All Questions from Actual Exam and 100% Correct Answers Updated 2023-2024 New Latest Version An organism with chloroplasts in its cells is probably. a. a heterotroph b. an autotroph c. an herbivore d. a primary consumer - B: Organisms that have chloroplasts in their cells carry on photosynthesis and are therefore autotrophs. Autotrophs make their own food. What property of water allows someone to fill a glass slightly above the rim without the water flowing over? a. specific gravity b. capillarity c. opacity d. surface tension - D: Water molecules are polar. Due to the fact that O2 draws the electrons in the molecule toward itself. The spaces between neurons are called? a. synapses b. dendrites c. inter-neurons d. cell gaps - A: An impulse travels down the axon of a neuron and reaches the terminus. There, chemicals are released in response, which travel across the synapse to the next neuron. Thus the impulse is transmitted to the next neuron. Which Group of chemicals is not normally found in most living things? a. carbohydrates b. proteins c. silicates d. nucleic acids - C: Carbohydrates, proteins, and nucleic acids (RNA and DNA) are all very important chemicals in living things. The alimentary canal is associated with the? a. spinal cord b. digestive system c. urinary tract d. birth canal - B: The alimentary canal begins at the mouth and ends at the anus. The numerous villi in the small intestine serve to? a. secrete enzymes for digestion b. absorb water from dissolved foods c. secrete hydrochloric acid to dissolve food d. provide greater surface for absorption - D: The villi are tiny projections in the small intestine that increase the total surface area of the intestine for absorption of digested nutrients. If a car's rate of change of velocity is negative, the car is? a. speeding up b. maintaining a constant speed c. slowing down d. stopped - C: If a car's rate of change of velocity is negative, the car's acceleration is negative. this means that the car is decelerating (slowing down). Consider the unbalanced equation N2+ H2 > NH3. What is the coefficient of ammonia in the balanced equation that has the smallest whole-number coefficient? a. 1 b. 2 c. 3 d. 4 - B: When balancing an equation, the number of atoms of each element must be the same on both sides of the equation: N2+3H2 > 2NH3 Which of these nitrogenous bases may be found in RNA, but not DNA? a. uracil b. adenine c. thymine d. guanine - A: Uracil is found in RNA but not DNA. Thymine is found in DNA but not in RNA. Guanine, cytosine and adenine are found in both. A substance with a ph of 8 is a? a. strong acid b. weak acid c. strong base d. weak base - D: A substance with a ph between 8 and 14 is basic. The closer the substance gets to a ph of 14, the more basic it is. Binary fission in paramecia and budding in yeast cells are examples of? a. asexual reproduction only b. sexual reproduction only c. spontaneous generation and sexual reproduction d. both sexual and asexual reproduction - A: Binary fission and budding are both examples of asexual reproduction, because cell division in both cases depends on mitosis. Which of these substances forms an alkaline solution in water? a. Mg(OH)2 b. H2SO4 c. MgSO4 d. NaCl - A: Magnesium hydroxide is the only base of the four choices. Thus in water, magnesium hydroxide releases hydroxide ions, forming a basic or alkaline solution. Certain seaweeds accumulate iodine in a concentration as much as a million times greater than that of the surrounding ocean. How must this intake be accomplished? a. osmosis b. diffusion c. active transport d. passive transport - C: Since the concentrations are so much greater in seaweed than in the surrounding water, iodine must have to move against a concentration gradient. Hydrogen can be prepared in the laboratory by combining Zn and HCl. In the resulting reaction, the metallic zinc (Zn). a. is changed to another element b. reacts with the water in the acid c. replaces the combined hydrogen in the acid d. serves as a catalyst - C: In the reaction, zinc replaces hydrogen and produces zinc chloride. Thus, hydrogen gas is released. Zn+2HCl > ZnCl2+H2 This is a single replacement reaction. Which of the following organisms has a nutritive process most similar to that of animals? a. seaweed b. oak tree c. grass d. bread mold - D: Bread mold is a fungus. Fungi are unable to make their own food and are dependent on other life forms for nutrition. Fungi are heterotrophs. The other choices are all autotrophs. The solubility of a solid in a liquid generally increases with? a. an increase in temperature b. an increase in pressure c. a decrease in temperature d. a decrease in pressure - A: Solubility of a solid in a liquid increases with increasing temperature but is unaffected by pressure. Pressure will only affect the solubility of a gas. Which of these substances has the highest boiling point? a. ether b. ethanol c. water. d. glycerol - C: Water molecules are attracted to each other by hydrogen bonds. The others are not dipoles, so the attraction between the molecules is minimal. In humans, if the diaphragm is pushed upward there is a decrease in chest volume. this decrease is followed by? a. an increase in pressure in the chest cavity and inhalation b. an increase n pressure in the chest cavity and exhalation c. a decrees in pressure in the chest cavity and inhalation d. a decrease in pressure in the chest cavity and exhalation - B: A decrease in volume results in an increase in pressure (Boyle's law) and thus exhalation. Which of these biological processes includes the other three? a. cell respiration b Krebs cycle c. electron transport chain d. anaerobic splitting of glucose - A: Cellular respiration begins with the splitting of glucose. The products then enter the Kreb's cycle and then the electron transport chain. A 5-year-old and her father each lifted identical chairs from the floor to the table top. Which person did the most work? a. the father b. the 5-year-old c. they both did the same amount d. not enough information is given - C: Work done is independent of who is doing it. Since both people move the object over the same distance and use the same force, they do the same amount of work. An excess of which of these ions tends to make a solution acidic? a. chloride b. hydroxyl c. hydronium d. sodium - C: Hydronium ions, or H3O+, are essentially hydrogen ions combined with a nearby water molecule. In essence, acids are characterized by the presence of hydrogen or hydronium ions. In the classification of two organisms, which of the following is the best evidence of a close relationship? a. similar number and arrangement of bones b. similar sequence of amino acids in their proteins c. similar methods of sexual reproduction d. similar methods of cell respiration - B: A similarity in amino acids suggests a similarity in the structure of the DNA and thus a close relationship between the organisms. In Einstein's equation, E=mc2, which does C represent? a. the quantum numbers of the atoms involved b. the number of coulombs c. the number of calories of heat d. the speed of light - D: Einstein's equation, E=MC2, means energy = mass x (speed of light)2 the vaporization of solid dry ice to gaseous carbon dioxide by heating is an example of? a. sublimation b. evaporation c. precipitation Vinegar is a common antidote for the ingestion of lye. What is the chemical process underlying this treatment? a. digestion b. alkalinization c. oxidation d. neutralization - D: Vinegar, an acid, neutralizes lye, a base. Undisturbed layers of rock were examined. Mammal, fish, and bird fossils were found only in the upper layers. Fish were in layers beneath those, and neither fish, birds, nor mammals were in the deepest layers. This would tend to support the hypothesis that? a. vertebrates always coexisted with invertebrates b. fish were the first vertebrates to evolve c. all vertebrates evolved at about the same time d. birds evolved before fish - B: New layers of sediment cover old ones and provide a record of emergence of flora and fauna. the fish were the only fossils found in the layers beneath the upper layers, indicating that they evolved first. Blue litmus paper will turn red when placed in a solution having which of the following ph values? a. 14 b. 12 c. 7 d. 3 - D: Blue litmus paper turns red when placed in an acid solution. A ph below 7 indicates an acid. Given the unbalanced equation KClO3 > KCl + O2 What is the coefficient of O2 in the balanced equation? a. 1 b. 2 c. 3 d. 4 - C: A balanced equation contains the same number of atoms of each element on both sides of the written reaction: 2KClO3 > 2KCl + 3O2. The compound H2SO4 is an example of? a. a salt b. a base c. an acid d. a halogen - C: H2SO4 is sulfuric acid. Acid may be defined as substances that release hydrogen ions in solution as the only positive ions. they may also be seen as protons donors. Bases release hydroxide ions, and salts have neither H+ or OH- ions. Halogens are elements. Many people believe that some trees drop their leaves in the late fall because the temperature is near freezing. Which of the following statements least supports this idea? a. Maple trees in northern Minnesota drop their leaves in late fall. b. Maple trees growing near city lights stay green longer than those far from the lights. c. Maple trees pass through a time of near freezing before they bud d. Maple trees in southern Florida drop their leaves in late fall - D: The statement supports the idea that leaves are dropped due to the temperature, because the temperature in southern Florida in late fall is not freezing, yet the leaves are dropping. The key word in the question is "least". Which of the following is considered a principal ecological role of green plants in the environment? a. providing shade to regulate the environmental temperature b. using the mineral content of the soil c. providing nesting places for animals d. manufacturing food from simple materials - D: Plants undergo photosynthesis, which allows them to make glucose from the simple materials carbon dioxide and water. In a flask containing 500 mL of NaCl(aq), the solvent is? a. Na+ b. H2O c. Cl- d. NaCl(s) - B: The notation "(aq)" refers to an aqueous solution, indicating that the solvent is water. The diameter of the low-power field of a certain microscope is 1.6 mm. The diameter of a cell that is half the diameter of the field is? a. 500 um b. 800 um c. 1000 um d. 1600 um - D: One half of the field = 800 um: 1 mm = 1,000 um, and 1.6 mm = 1,600 um. Twenty-five milliliters of a saline solution contains 5g of NaCl. What percentage solution is it? a. 5% b. 12.5% c. 20% d. 25% - C: We assume that 1 mL of water has a mass of 1g. So 25 mL equals 25g. Divide 5 by 25 and convert to percentage. In pea plants, plant height and seed color obey the law of independent assortment. If seeds are hybrid for both of these traits, how will their offspring most likely appear? a. all tall, with green seeds b. all short, some with yellow and some with green seeds c. some tall and some short, with all green seeds d. some tall and some short, with green or yellow seeds - D: The law of independent assortment states that traits are passed onto offspring independently of each other. Thus, a seed may contain either of the height alleles and either of the color alleles. During the 1930s and through the 1950s, thousands of American children received x- ray treatment for swollen tonsils and adenoids. X-rays are no longer used to treat this condition because large doses of radiation? a. were found to stimulate excessive hair growth b. are thought to cause certain types of cancer c. are thought to increase the severity of acne during adolescence d. were found to increase the number of cases of tonsillitis. - B: Radiation exposure has been linked to cancer. A student studies a structure microscopically and notes that it contains glandular cells. It has blood vessels entering and leaving it, but it has no duct leading out of it. The structure must be? a. an endocrine gland b. an excretory gland c. a digestive gland d. a tear gland - A: Endocrine glands are ductless glands with blood vessel associations. Exocrine glands, such as digestive and tear glands, empty their secretions through ducts. Which laboratory reagent turns starch blue-black? a. phenolphthalein b. Benedict's solution c. nitric acid d. Lugol's solution - D: Lugol's solution (iodine plus potassium iodide) is an indicator that turns blue-black in the presence of starch. What types of body cells are most directly involved when a person walks up hill? a. smooth muscle cells b. subcutaneous cells c. striated muscle cells d. epithelial cells - C: Muscles are the tissues mostly involved when a person is exercising. Smooth muscle is found in the lining of organs such as the uterus. Skeletal muscle, such as that found in the muscles of the legs and arms is striated. When red food coloring is added to a beaker of water, the coloring slowly spreads until the water is all colored pink. This is best explained by the process of? a. peristalsis b. diffusion c. active transport d. osmosis - B: A drop of food coloring will slowly diffuse through the beaker of water until it reaches equilibrium when it will be fully dispersed. It moves from the area of greater concentration to the area of lower concentration. The first step by which a mutation my occur is a change in the ? a. location of a nitrogen base in DNA b. messenger RNA c. transfer RNA d. amino acid in a protein synthesis - A: The sequence of messenger RNA, transfer RNA, and amino acids in protein synthesis all depend on the sequence of DNA found in the nucleus. Thus the fist step in which a mutation may occur is at the level of the DNA, which is made up of a specific sequence of basis. In the equilibrium system A + B <> C + 30 kcal we can say that the? a. reverse reaction is exothermic b. forward reaction is exothermic c. reverse reaction requires a catalyst d. forward reaction is endothermic - B: The forward reaction is exothermic because heat is shown as one of the products. The reverse reaction is endothermic since heat is shown as a product. We do not know about a catalyst from the information given. A compound that can act like either an acid or a base is described as? a. amphoteric b. isomeric c. hydrolytic d. polymeric - A: An amphoteric substance can behave either as an acid or a base. Water is an example of an amphoteric substance because it can act as an acid by furnishing a proton, or it can act as a base by accepting a proton. The diffusion of water through a semipermeable membrane is called? a. pinocytosis b. osmosis c. active transport d. transpiration-tension - B: Osmosis is the diffusion of water from areas that contain a high concentration of water to area that contains a low concentration of water. Bean plant seeds are germinated in a dark closet. The seedlings lack the color green. Which of the following statements is the best explanation for this? a. Bean plants are heterotrophs b. Bean seedlings lack nitrogen in their seed leaf c. The absence of an environmental factor limits the proper genetic expression d. Bean plants cannot be classified as green plants - C: The seedlings lacked light, which interfered with their development. An organism that has jointed legs, an exoskeleton, and a specialized segmented body belongs to the phylum of? a. mollusks b. echinoderms c. arthropods d. chordates - C: An example of an arthropod is a lobster. Nerve impulses form the retina are transmitted to the brain by the? a. olfactory nerve b. optic nerve c. Eustachian tube d. auditory nerve - B: The Eustachian tube and auditory nerve are associated with the ear, and the olfactory nerve is involved with the sense of smell. In which of these structures does the normal development of a human embryo occur? a. ovary b. uterus c. vagina d. oviduct - B: The ovary releases the egg into the oviduct, or fallopian tube where it is fertilized. If fertilization occurs, the zygote travels to the uterus, where it implants itself and develops. In humans, which of these blood components carries most of the oxygen? a. plasma b. white blood cells c. platelets d. red blood cells - D: Red blood cells contain hemoglobin, which binds, transports and delivers oxygen throughout the body. Compound A reacts with compound B to give compound C plus compounds D and E, as shown by the following equation: A+B> C+D+E If in a closed system, 7g A react with 4g B to give 2g C plus 3g E, how many grams of D are produced? a. 5 b. 6 c. 11 d. 16 - B: The law of conservation of mass says that mass may be neither created nor destroyed. Therefor, the mass of the reactants must be equal to the mass of the products of a reaction. Which of the following statements best describes how pressure and volume are affected as a sample of ideal gas is heated in a rigid, sealed container? a. neither pressure nor volume will increase b. pressure will remain constant, and volume will increase c. both pressure and volume will decrease d. pressure will increase, and volume remains constant - D: A rigid container implies no change in volume. According to Gay-Lussac's law, at constant volume an increase in temperature cause and increase in pressure and vice versa. An object is traveling at a constant velocity of 100m/sec. How far will it travel in 20 sec? a. 5m b. 120m c. 200m d. 2,000m - D: Distance traveled is directly proportional to velocity and time. Distance = velocity x time, distance = 100m/secx20sec=2,00m A student placed a stone in a gradulated cylinder containing 30cm3 of water. She then noted that the water level rose to 55cm3 mark. What is the volume of the stone? a. 25cm3 b. 30cm3 c. 55cm3 d. 85cm3 - A: The stone causes the volume in the cylinder to increase by 25cm3 (55cm3-30cm3). The volume of a liquid displaced by a submerged object is equal to the volume of the object itself. Therefor, the volume of the stone is 25 cm3. A 36-W lam is operated by a 9-V battery. How many amperes of current are flowing through the lamp? a. 0.25 A b. 4 A c. 27 A d. 45 A - B: Power = Voltage x current; 36w = 9v x current; current = 4a Which of the following terms are included in the scientific name of an organism? a. genus and species b. phylum and species c. family and genus d. kingdom and phylum - A: Genus and species make up the scientific name of an organism. Which of the following would be classified as an example of connective tissue? a. striated muscle b. epidermis c. nerve d. tendon - D: Connective tissue binds and supports other tissues. For example, tendons attach muscle to bone. Muscle is muscular tissue, epidermis is epithelial tissue, and nerve is nervous tissue. The entry and exit of materials in the animal cell are regulated by which of these cell organelles? a. nucleolus b. cell wall c. endoplasmic reticulum d. plasma membrane - D: The plasma mermbrasne, which is make of carbohydrates, lipids and proteins, is selectively permaeable and regulates traffic into and out of a cell. Which of the following structures is the functional unit of the human lung? a. bronchus b. Malpighian tubule c. nephron d. glucose - D: Benedict's solution is used to indicate the presence of monosaccharides, glucose. Which are herbivores? a. green plants b. insects c. birds d. snakes - B: Herbivores are animals that feed on plants. Thus, insects are herbivores because they consume green plants. According to this pyramid to support 100 lb of birds, which of the following is needed? a. more then 100 lb of insects b. more than 100 lb of snakes c. less than 100 lb of green plants d. 100 lb of insects - A: The diagram increases in size in the direction of birds to insects, indicating that more insects are required to support a certain amount of birds. Thus, 100 pounds of birds will consume an amount of insects excedding 100 pounds. Ozone is an allotrope of? a. hydrogen b. water c. oxygen d. uranium - C: Ozone (O3) is an allotrope of oxygen. It is a molecule made up of more than two atoms of the same element. Which of these values could be the ph of an acid rain sample? a. 12.0 b. 8.0 c. 7.0 d. 4.0 - D: Acid rain has an acidic pH. A substance with a pH between 0 and 7 is an acid. A specific isotope has an atomic number of 51 and a mass number of 122. How many electrons are contained in the neutral atom? a. 51 b. 71 c. 122 d. 173 - A: The mass number is the sum of the number of protons and neutrons. The atomic number is the number of protons, which is always equal to the number of electrons in a neural atom. A mixture such as mayonnaise is best described as? a. a substance b. saturated c. a solution d. an emulsion - D: Mayonnaise is made up of oil, vinegar and eggs which form a type of heterogeneous mixture called an emulsion. An emulsion will eventuallly separate, while a solution will not. The terms "saturated" and "unsaturated" refer to solutions. Mixtures are not substances. Which of the following terms is the SI unit for work? a. joule b. watt c. ampere d. meter - A: The joule is the unit of energy equal to the work done by a force of 1 N acting over a distance of 1 m. A woman standing at a bus stop hears the siren of an approaching ambulance. As the ambulance passes by her, she observes a shift in the frequency of the siren. The effect she heard is known as the? a. photoelectric effect b. Doppler effect c. phase shift effect d. Einstein effect - B: The Doppler effect occurs whenever there is a relative morion between the source of the sound waves and the observer. The pitch of a siren becomes higher as it approaches you and lower as it drives away. the siren has not changed its frequency, byt the motion of the siren toward you increases the frequency of the sound waves you hear. The pitch of ta vibrating string depends on all of the following except? a. the length of the string b. the amplitude of the vibration c. the thickness of the string d. the frequency of the vibration - B: Observed pitch is independeent of the amplitude of the vibration. The amplitude is related to the loudness of the sound. The pitch of a string is affected by thickness, length, and frequency. The specific heat of water is 1 cal/g/C. How many calories of heat are needed to raise the temperature of 30g of water from 25 C to 75 C. a. 50 Cal b. 750 Cal c. 1,500 Cal d. 2,250 Cal - C: The specific heat capacity of a substance is the heat required to raise the temperature of 1g of a specific substance by 1C. In the case of water, the specific heat capacity is 1 Cal/g/C. In this situation, you want to change 30g of water by 50C. As the angle of incidence of a ray of light striking a mirror increases, the angle of reflection will? a. increase b. decrease c. remain the same d. first increase, then remain constant - A: ccording to the law of reflection, the angle of incidence and the angle of reflection will be equal. The idea that new varieties of organisms are evolving today is best supported by the? a. increasing need for new antibiotics b. diminishing size of the ozone layer c. climate changes resulting in global warming d. increasing size of the human population - A: The developement of resistant strains of bacteria, thus prompting the need for new antibiotics, is an example of evolution occurring today. The ozone layer, global warming, and increasing population size are changes in selective pressure, but not examples of evolution. In a food chain, an organism that feeds on green plants is known as a? a. decomposer b. producer c. first-order consumer d. second-order consumer - B: Green plants are producers because they produce their own food by means of photosynthesis. Consumers depend on other organisms for their food. A first-order (primary) consumer is an herbivore and eats plants and alge. A second-order (secondary) consumer is a carnivore and eats herbivores. Which of the following parts of a compound microscope is used to adjust the amount of light? a. diaphragm b. objective lens c. eyepiece d. coarse adjustment knob - A: The diaphragm adjusts the amount of light in a microscope. A cell is placed in a drop of distilled water. The cell swells and bursts. The most likely cause of this reaction is that? a. active transport of salts occurs b. water moves from an area of low particle concentration to an area of high particle concentration c. water moves from an area of high particle concentration to an area of low particle concentration d. salts from the distilled water enter the cell - B: Osmosis refers to the diffusion of water from areas that contain a high concentraion of water and low concentration of solute (outside the cell) to areas that contain a low concentration of water and high concentration of solute (inside the cell). In pea plants, tallness is dominant over shortness. If 25% of one generation of pea plants is short, what were the probable genotypes of the parents? a. tt x tt b. Tt x tt c. TT x Tt