127 TEAS Test Science Questions And 100% Correct Answers, Rated A+

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127 TEAS Test Science Questions And 100% Correct Answers An organism with chloroplasts in its cells is probably. a. a heterotroph b. an autotroph c. an herbivore d. a primary consumer Ans: B: Or ... ganisms 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 Ans: 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 Ans: 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 Ans: 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 Ans: 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 foodd. provide greater surface for absorption Ans: D: The villi are tiny projections in the small intestine that increase the total surface area of the intestine for absorption of digested nutrients. As light passes obliquely from air to water, it is bent. This bending is called? a. diffraction b. reflection c. refraction d. dispersion Ans: C: Refraction is the bending of light as it passes obliquely from one medium to another. Which of the following organelles is not involved in protein synthesis? a. ribsome b. mitochondrion c. rough endoplasmic reticulum d. nucleus Ans: D: The nucleus contains DNA. The ribosomes, located on the rough endoplasmic reticulum, are the site for protein synthesis. To be absorbed by cells, proteins must be changed to? a. amino acids b. sucrose c. fatty acids d. glycerol Ans: A: Amino acids are the end products of protein digestion and are small enough to be absorbed. A neuron that transmits impulses from the receptors to the spinal cord is called? a. motor neuron b. an associative neuron c. an interneuron d. a sensory neuron Ans: D: A sensory neuron conveys a message from a sensory organ to the spinal cord, which transmits the message via a motor neuron to the effector muscle. Which group of organisms help prevent the accumulation of organic wastes in nature? a. rabbits b. mosses c. bacteria d. ferns Ans: C: Bacteria comprise the decomposer portion of the food chain. As the eardrum is made to vibrate more rapidly, the sound is perceived as? a. louder in intensity b. softer in intensity c. higher in pitch d. lower in pitch Ans: C: High-pitch sounds are heard when the receptor cells closer to the oval window are stimulated, and low-pitch sounds result from the stimulation of the cells that are farther down the cochlea.In a field of pure white asters, a grower noticed a single blue aster. How could the grower test whether this change affected the gamete-producing cells of the plant? a. self-pollinate the flower, and plant the resulting seeds b. examine the blue petals under an electron microscope c. preform a chemical analysis to find the nature of the blue pigment d. preform vegetative propagation on a cutting of the plant Ans: A: Remember that during a phase change from liquid to gas the temperature remains constant at 100C. A human egg will develop into a female if it is fertilized by sperm containing? a. an X chromosome b. a Y chromosome c. an XY chromosome d. an XXY chromosome Ans: A: A female has two X chromosomes, and a male has one X chromosome and one Y chromosome. For a human egg to develop into a female, it must be fertilized by a sperm containing an X chromosome. In a food chain involving grass, grasshoppers, birds and mammals, the orginal source of energy is? a. glucose b. sunlight c. chlorophyll d. ATP Ans: B: Sunlight is absorbed by the chlorophyll contained in plants. The absorbed energy fuels photosynthesis which produces glucose. In this food chain, grass is the producer. Which of the following equations represents a neutralization reaction? a. 2Na+MgCl2 > Mg+2NaCl b. CaCO3+4C > 3CO+CaC2 c. 4NH3+5O2 > 6H2O+4NO d. H2CO3+Ca(OH)2 > 2H2O+CaCO3 Ans: D: Equation d is a reaction between an acid (carbonic acid) and a base [(Ca(OH)2] to form water and a salt. It is the only neutralization reaction among the choices. A reading on the Celsius scale is 5. On the Fahrenheit scale, the reading would be closet to? a. 225 b. 30 c. 40 d. 95 Ans: C: the formula for converting temperature in Celsius to temperature in Fahrenheit is: T Fahrenheit = 9/5 x T Celsius + 32, therefore 5 degrees Celsius convert to 41 degrees Fahrenheit. 9/5 x 5 = 9 9 + 31 = 41F Which of these formulas represents an alcohol? a. C2H5OC2H5b. C3H8 c. CH3COOH d. C2H5OH Ans: D: An alcohol is usually characterized structurally by the presence of an OH group attached to a hydrocarbon. 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 Ans: 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 Ans: 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 Ans: 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 Ans: 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 Ans: 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. MgSO4d. NaCl Ans: 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 Ans: 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 Ans: 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 Ans: 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 Ans: 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 Ans: 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 Ans: 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 Ans: 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 Ans: 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 Ans: 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 Ans: 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 heatd. the speed of light Ans: 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 d. condensation Ans: A: Sublimation is the direct vaporization of a solid by heating, without passing through a liquid state. On top of a mountain, the boiling point of water is? a. lower then at sea level, because the atmospheric pressure is higher on the mountain b. lower then at sea level, because the atmospheric pressure is lower on the mountain c. the same as at sea level, because the atmospheric pressure is the same in both locations d. higher then at sea level, because the atmospheric pressure is lower on the mountains Ans: B: The boiling point of a solution is the temperature at which the vapor pressure is equal to the pressure of the atmosphere. Suppose cube A is 10cm along each edge and cube B is 5 cm along each edge. What is the relationship of the volume of cube A to that of Cube B? a. cube A has two times the volume of cube B b. cube A has four times the volume of cube B c. cube A has six times the volume of cube B d. cube A has eight time the volume of cube B Ans: D: Cube A has a volume of 1,000 cm3, whereas cube B has a volume of 125 cm3. Cube A has 8 times the volume of cube B. Which of these substances is a product of cellular respiration in animals? a. ATP b. RNA c. ethanol d. oxygen Ans: A: Cellular respiration is an energy-yielding process that releases ATP (adenosine triphosphate) from organic molecules. The tiny projections in the small intestine adapted for absorption are called? a. venules b. villi c. alveoli d. nephrons Ans: B: Villi are tiny projections that are barely visible to the naked eye. More energy is used in pushing a box up along an inclined plane to a height of 4 m then in liftting the box straight up to the same height. This is because? a. more force is needed in pushing the box then in lifting it b. work is done against friction in pushing the box along the plane c. the box moves a greater distance when pushed along the plane then when liftedd. it takes more time to push the box along the plane then to lift it Ans: B: Whenever a box is along a surface, energy goes into counteracting friction. The amount of energy required is determined by the coefficient of friction. A student wants to grow a bacterial culture. Which of these environments is best suited for growing most most kinds of bacteria? a. a lighted window at 72 F b. a refrigerator at 45 F c. an incubator at 37 C d. a freezer at 10 C Ans: C: The optimal temperature at which bacteria grows is 37C. A closed container of hydrogen gas is warmed from 20 C to 25 C. If the volume remains the same, what will happen to the pressure in the container? a. it will remain the same b. it will decrease c. it will fluctuate d. it will increase Ans: D: According to Gay-Lussac's law of gases, as temperature increases at a constant volume, pressure increases proportionally. The pressure will increase. Most of the work done by the human kidney occurs in the? a. nephron b. neuron c. ureter d. alveolus Ans: A: The functional unit of the kidney is the nephron. Urine is formed in the nephron by the processes of filtration, re-absorption, and secretion. An equal-arm balance is balanced when 20 washers are on one side and 10 bolts are on the other. Four bolts are added to one side. How many washers must be added to the other side o maintain balance? a. 14 b. 8 c. 4 d. 2 Ans: B: Since the equal-arm balance is balanced at a ration of 20 washers to 10 bolts, the weight of the bolts must be double that of the washers. Two washers are equivalent in mass to 1 bolt. Thus, 4 bolts are equivalent in mass to 8 washers. An increase of 4 bolts on one side will require 8 washers on the other side to maintain the balance. Compounds with different molecular structures but but the same formula are called? a. isomers b. isobars c. isotopes d. isotherms Ans: A: Isomers are compounds that have the same formula but different molecular structure. Isobars indicate the same pressure. Isotopes are atoms with thesame atomic number but different mass numbers, and isotherms indicate the same temperature. A student wanted to test the effects of different sugars on the growth of a certain mold. The sugars to be tested were glucose, fructose, and sucrose. One gram of each sugar was placed in a tube of 10 mL of water, and a bit of the mold was put in each of the three solutions. To add a control to the experiment, the student should also have? a. made two Ans: C: A control for this experiment would be to grow the mold in just water so that the results of the mold growth with sugar can be compared to the mold growth without sugar. 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 Ans: 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 Ans: 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 Ans: 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 Ans: 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 saltb. a base c. an acid d. a halogen Ans: 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 Ans: 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 Ans: 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. Cld. NaCl(s) Ans: 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 Ans: 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% Ans: 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 Ans: 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 xray 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. Ans: 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 Ans: 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 Ans: 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 [Show More]

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