TEAS 7 Test Science Questions and 100% correct answers 2023

TEAS 7 Test Science Questions and 100% correct answers 2023 a. {ANS} - 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 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. a. b. proteins c. silicates d. nucleic acids important chemicals in living things. and nucleic acids (RNA and DNA) are all very 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. a. d. dispersion {ANS} - C: Refraction is the bending of light as it passes obliquely from one medium to another. a. r b 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. a. d. glycerol {ANS} - A: Amino acids are the end products of protein digestion and are small enough to be absorbed. nsmits impulses from the receptors to the spinal cord is called? a. motor neuron b. an associative 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. C2H5OC2H5 b. C3H8 c. CH3COOH d. C2H5OH alcohol is usually characterized structurally by the presence of an OH a. {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 a. 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. MgSO4 d. 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.