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NLN Test Bank Practice Test Science
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6CO2 + 12H2O -> C6H12O6 + 6O2 + 6H20 - ANSThe reaction shows in equation d is the reverse of aerobic respiration = photosynthesis A 36-W lamp is operate by a 9-v battery. How many amperes of current are flowing through the lamp? - ANSpower = voltage x current 36 watts = 9V x current in amperes A 4-N newton and an 18N is acting in opposite directions on the same point of an object. The magnitude of their resultant is - ANS14N When two forces act in opposite directions, the total force is determined by subtracting the smaller force from the larger one. A 5 year old and her father each lifted identical chairs from the floor to a table top. Which person did the most work? - ANSThey both did the same amount A cell is placed in a drop of distilled water. The cell swells and bursts. The most likely cause of this reaction is that - ANSwater moves from an area of low particle concentration to an area of high particle concentration
Osmosis refers to the diffusion of water from areas that contain a high concentration 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) A chemical change always involves the formation of a - ANSnew substance a substance can be either an element or a compound A closed container of hydrogen gas is warmed from 20C to 25C. If the volume remains the same, what will happen to the pressure in the container? - ANSit will increase According to Gay-Lussac's law of gases, as temperature increases at a constant volume, pressure increases proportionally. The pressure will increase. A cloud chamber is a device used for - ANSstudying charged particles a cloud chamber makes the paths of ionizing radiation rays visible. The device reveals the paths of high-speed charged particles. A compound that can act as like either an acid or base is described as - ANSamphoteric amphoteric substance can behave either as an acid or 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
An emulsion will eventually separate, while a solution will not. The terms "saturated" and "unsaturated" refer to solutions. Mixtures are not substances A neuron that transmits impulses from the receptors to the spinal cord is called - ANSa sensory neuron A particle of light energy is called - ANSphoton light can be described as both being wavelike and particulate properties A reading on the Celsius scale is 5 degrees. On the Fahrenheit scale, the reading would be closest to - ANS A second order/ secondary consumer - ANSis an carnivore and eats herbivores A simple series circuit carries a current of 3.00 amps when the potential difference across it is 24.0 v. The resistance of the circuit is - ANSOhm's Law Resistance = voltage/amps R = 24.0v/ 3.00 amps 8.0 Ohms
A small foil disk was attached to a leaf of a plant that was placed in a well lighted spot. After 2 hours, the leaf was removed from the plant, and chlorophyll extracted from it. How would the leaf appear after it was stained with Lugol' s solution (iodide) - ANSmostly black, except for a white area corresponding to the presence of the disk. Iodine is used to test for the presence of starch, which is a secondary product of photosynthesis. The portion of the leaf covered by the disk would have not carried out photosynthesis while it was covered. A solution with an hydrogen ion concentration of 1 X 10 raised to -7 is classified as - ANSneutral it has a pH of 7 and by definition is neutral A specific isotope has an atomic number of 51 and a mass number of 122. How man electrons are contained in the neutral atom? - ANS51 electrons 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 an neutral atom. A structure associated with osmosis in the amoeba and paramecium is the
- ANScontractile vacuole the contractile vacuole in fresh water protozoa is used to pump out excess water that enters the cell with the concentraction gradient by osmosis.
function: so-called flight or fight hormone, regulate water balance, blood pressure, joint articulation. Ampere - ANSis an unit to measure electrical current An animal whose retina has no cones cells probably cant - ANSdistinguish colors Cone cells in the retina are receptors for different frequencies of visible light and therefore can distinguish colors An excess of which of the following ions tends to make a solution acidic? - ANSHydronium 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. An object is traveling at a constant velocity of 100 m/sec. How far will it travel in 20 sec? - ANS2,000 m 100m/sec x 20 sec - 2,000m an organelle near the nucleus of a cell that contains the centrioles (in animal cells) and from which the spindle fibers develop in cell division. - ANS An organism that has jointed legs, an exoskeleton and a specialized segmented body belongs to the phylum - ANSarthropods
and example of an arthropod is a lobster An organism with chloroplast in its cell is probably a - ANSautotroph An overdose of muscle relaxant may cause a person to cease breathing because - ANSthe diagram will be unable to contract the diagram must contract for inhalation to occur, and, as a muscle, the diaphragm is affected by the muscle relaxant An unbalanced force of 5.00N causes an object to accelerate at 2.0m/sec. The mass of the object, in kilograms is - ANSAccording to Newton second law of motion, the mass of an object is directly proportionally to the force exerted on it an inversely proportionally to its acceleration m = F/a m = 5/2 = 2.5kg An unknown substance is boiled with Benedict's solution. The brick red color that results is the presence of - ANSglucose Benedict's solution is used to indicate the presence of monosaccharides , glucose As light passes obliquely from air to water, it is bent. The bending is called - ANSrefraction
feed on. Predators include owls, snakes, wild cats, crocodiles and sharks. Humans can also be called predators. - ANSAt the top of the levels are Predators. autotrophs - ANSare organisms that produce their own food from inorganic substances, plants are autotrophs 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? - ANSthe absence of an environmental factor limits its proper genetic expression. Bean seed diagram Which letter represents stored food for growing embryo? page 233` - ANSA points to the endosperm, which provides the growing embryo with nutrients. B and D point to the seed coat, an C points to the embryo. Binary fission in paramecia and budding in yeast cells are examples of - ANSasexual reproduction only because cell division in both cases depends on mitosis Blood returning to the heart from the body travels through the vena cavae and enters the - ANSright atrium the right side of the heart collects deoxygenated blood from the body and pumps it to the lungs. The atrium is the entryway to the heart
Blue litmus paper will turn red when placed in a solution having which of the following pH values? - ANS blue litmus paper turns red when placed in an acidic solution. A pH below 7 indicates an acid. C6H12O6 -> 2CO2 + 2C2H5OH +2ATP - ANSfermentation C6H12O6 + C6H12O6 -> C12H22O11 +H20 - ANSdehydration synthesis Certain seaweeds accumulate iodine in a concentration as much as a million times greater than that of a the surrounding ocean. This is due to - ANSactive transport Since the concentration is so much in seaweed than in the surrounding water, iodine must have to move against a concentration gradient. Thus, the transport process using energy must be involved for the seaweed to accumulate such a great concentration of iodine. coarse adjustment knob - ANSThe coarse adjustment knob elevates the microscope's stage up and down quickly Compound A reacts with compound B to give compound C plus compound D and E as shown by the following equation A + B ----> C + D + E
During the 1930's and through the 1950's. 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 - ANSare thought to cause certain types of cancer electrical power is equal to the voltage times the current - ANSpower = voltage x current Eustachian tube and auditory nerve are associated with - ANSear Green plants are _____________ because they produce their own food through photosynthesis - ANSproducers herbivores - ANSplant eaters heterotrophs - ANSobtain their food by consuming plants or other animals. They are also referred to as consumers. Primary consumers may be herbivores How much of 12 g of a radioactive isotope with a half life of 20 years will be left after 40 years? - ANS3 g If a car rate's of velocity is negative, the car is - ANSslowing down 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)
If a patient gallbladder was removed from surgery, which of the following substances would he have the most difficultly digesting? - ANSfats The gallbladder stores bile, which is the substance produced by the liver. Bile contains bile salts, which aid in the digestion of and absorption of fats. If a solution turns litmus blue, it will also turn phenolphtalein - ANSpink turning the litmus paper blue = base thus phenolphtalein will turn pink in a base If attempts to decompose a substance prove to be unsuccessful, the substance is probably - ANSan element Decomposition as a chemical reaction, is the breakdown of a complex substance into simpler substances. An element is the simplest chemical substance 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? - ANSself-pollinate the flower, and plant the resulting seeds. Self pollination would allow the plant to produce gametes sperm and eggs that would unite and form seeds. Observing the color of the plants from
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? - ANSsome tall and some short, with either green or yellow seeds 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. 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? - ANSTt x Tt In the classification of two organisms, which of the following is the best evidence of a close relationship? - ANSsimilar sequence of amino acids in their proteins A similarity in amino acids suggests a similarity in the structure of the DNA and thus a close relationship between two organisms. In the diagram, a ray of light travels from air to glass page 239 which of these measuring instruments is needed to find the index of refraction of glass? - ANSA protractor
a light beam is bent as it passes obliquely into a substance of greater optical density. The device used to measure an angle is a protractor In the equilibrium system A + B --->------< C = 30 kcal we can say that - ANSforward reaction is exothermic because heat is shown as one of the product. Exo = heat exiting out of the equation on the product side An exothermic reaction is a chemical reaction that releases energy by light or heat. Expressed in a chemical equation: reactants → products + energy. Many chemical reactions release energy in the form of heat, light, or sound. These are exothermic reactions. In the reaction 2H2O2 ------------> 2H2O + O MnO2 - ANSMagnesium dioxide (mnO2) is a common catalyst used to decompose hydrogen peroxide into water and oxygen. "MnO2" is written above the arrow, indicating that it is not a reactant, but a catalyst In which of these media will monochromatic light have the lowest speed? - ANSdiamond with an refractive index of 2.
Machines may be used for all of the following purposes except to - ANSincrease energy conservation of energy forbids a machine from increasing energy. Machines are designed to use energy efficiently. Machines cannot be designed to increase energy; they use energy to do work Many chemical reactions occur more rapidly with platinum as a catalyst. At the end of the reaction, the platinum is found to be - ANSunchanged in weight A catalyst only affects the rate or speed of reaction and is not changed or consumed during it. More energy is used in pushing a box up along an inclined plane to a height of 4 m than in lifting the box straight up to the same height. This is because - ANSwork is done against friction in pushing the box along the plane Whenever, a box is pulled along the surface, energy goes into counteracting friction. The amount of energy required is determined by the coefficient of friction Most of the work done in the human kidney occurs in the - ANSnephron the functional unit of the kidney is the nephron. Urine is formed in the nephron by the processes of filtration, reabsorption, and secretion
Nerve impulses from the retina are transmitted to the brain by the - ANSoptic nerve Objects X and Y are identical. In a laboratory, object X is dropped at the same moment that object Y is thrown horizontally. The paths followed by X and Y are shown in the following diagram - ANSX and Y will hit the ground simultaneously Any horizontal motion, such as that of an object Y, is irrelevant because it will not affect the time taken to drop that distance. Ohm's law is used to study of - ANSelectricity Ohm's law applies to the application of electricity. It states that voltage (V) is proportional to current (I) and resistance (R) V =IR olfactory nerve is associated with - ANSsense of smell omnivores - ANSplant and meat eaters On top of a mountain, the boiling point of water is - ANSlower than at sea level, because the atmospheric pressure is lower on the mountain the boiling point of a solution is the temperature at which the vapor pressure is equal to the pressure of the atmosphere. At the top of the
