TEAS 7 Science Practice Test

Correct Answer: B

Rationale: The correct answer is B: tongue. The tongue is the muscular organ responsible for processing food into smaller pieces by moving it around the mouth, mixing it with saliva to form a bolus, and pushing the food towards the back of the mouth to swallow. The pharynx (choice A) is the passageway for food and air, the diaphragm (choice C) is a muscle involved in breathing, and the stomach (choice D) is responsible for further digestion of food. The tongue's specific functions in manipulating food and aiding in swallowing make it the correct choice for this question.

Correct Answer: C

Rationale: The correct answer is C. When two heterozygous mice (WwSs) are crossed, they can produce offspring with genotypes of Ww, WW, ww, Ss, SS, ss. Therefore, the most likely genotype for their offspring is WwSs. Choice A (wwss) is incorrect because it doesn't account for the possibility of capital letters in the genotypes. Choice B (WWSS) is incorrect because it represents the homozygous dominant genotype, which is less likely when crossing heterozygous mice. Choice D (WWSs) is incorrect because it assumes the offspring will have two dominant alleles for the first trait and one dominant allele for the second trait, which is less likely than having both traits in heterozygous form.

Correct Answer: D

Rationale: The correct answer is D because a control group is necessary in experiments to compare results with a group that does not receive the experimental treatment. In this case, if tanks A, B, or C were chosen as the control group, there would be no basis for comparison with a group that did not receive any treatment. Therefore, without a specific control group that does not undergo any experimental manipulation, it is not possible to determine the true impact of the treatment being tested. Tanks A, B, and C cannot serve as the control group in this experiment as they are all part of the experimental setup and are not kept untreated for comparison.

Correct Answer: C

Rationale: The correct answer is C (50 neutrons). Neutrons are calculated by subtracting the atomic number from the mass number. The mass number represents the total number of protons and neutrons in an atom. Since the atomic number (number of protons) is not given, we use the mass number as a total. Therefore, for an atom with a mass number of 50, it must have 50 neutrons. Choice A (38) is incorrect because it does not match the given mass number. Choice B (88) is incorrect as it is not the correct calculation based on the mass number provided. Choice D (126) is incorrect as it is not the correct calculation based on the mass number provided.

Correct Answer: B

Rationale: The correct answer is B: semilunar valves. Semilunar valves are located at the exits of the heart's major blood vessels (pulmonary artery and aorta) and prevent blood from flowing back into the heart after it has been pumped out. Atrioventricular valves (choice A) prevent backflow between the atria and ventricles, tricuspid valves (choice C) and bicuspid valves (choice D) are specific types of atrioventricular valves. Therefore, choices A, C, and D do not primarily prevent blood flow from major blood vessels to the heart, making them incorrect.