ATI TEAS 7
Science TEAS Practice Test
1. Which organ is primarily responsible for detoxification in the body?
- A. Kidney
- B. Liver
- C. Lung
- D. Heart
Correct answer: B
Rationale: The liver is the primary organ responsible for detoxifying chemicals and metabolizing drugs in the body. It plays a crucial role in breaking down toxins, filtering blood, and producing bile, making it essential for overall detoxification processes. The kidney primarily filters waste and excess substances from the blood to form urine. Lungs are responsible for gas exchange, not detoxification. The heart is responsible for pumping blood and does not play a direct role in detoxification processes.
2. When a biologist describes the physical and visible expression of a genetic trait, which of the following is being referred to?
- A. Phenotype
- B. Allele
- C. Gamete
- D. Genotype
Correct answer: A
Rationale: The correct answer is A: Phenotype. Phenotype specifically refers to the observable physical characteristics resulting from the interaction of an individual's genetic makeup (genotype) with environmental influences. It represents the outward expression of an organism's genetic makeup. Allele, represented by choice B, refers to different forms of a gene and is not the visible expression of a trait. Gamete, represented by choice C, is a reproductive cell and not directly related to the physical expression of traits. Genotype, represented by choice D, refers to the genetic makeup of an organism and is distinct from the observable physical characteristics denoted by phenotype.
3. Which of the following statements is true about the immune system?
- A. The immune system is controlled by the hypothalamus.
- B. The immune system filters toxins out of the blood.
- C. The immune system stimulates the production of blood cells in response to infections.
- D. The immune system helps the body avoid, detect, and eliminate infections.
Correct answer: D
Rationale: The correct answer is D. The immune system's primary function is to help the body avoid, detect, and eliminate infections. It does so by recognizing and responding to harmful pathogens, such as bacteria and viruses, to maintain the body's health and well-being. Choices A, B, and C are incorrect because the immune system is not controlled by the hypothalamus, its main role is not to filter toxins out of the blood, and while it can stimulate the production of certain immune cells, it does not directly stimulate the production of blood cells in response to infections.
4. When human cells divide by meiosis, how many chromosomes do the resulting cells contain?
- A. 96
- B. 54
- C. 46
- D. 23
Correct answer: D
Rationale: When human cells divide by meiosis, the resulting cells contain 23 chromosomes. This is because meiosis is a cell division process that reduces the chromosome number by half, resulting in cells with a haploid number of chromosomes. In humans, the diploid number of chromosomes is 46. Therefore, after meiosis, the resulting cells have 23 chromosomes, ensuring the correct chromosome number is restored upon fertilization. Choices A, B, and C are incorrect as they do not represent the correct chromosome number resulting from meiosis in human cells.
5. What is the name of a condition where the heart rate is 118 beats per minute (bpm)?
- A. Tachycardia
- B. Apnea
- C. Bradycardia
- D. Tachypnea
Correct answer: A
Rationale: The correct answer is A: Tachycardia. Tachycardia is a condition characterized by a heart rate that exceeds the normal resting rate, typically above 100 bpm. In this case, a heart rate of 118 bpm falls within the range of tachycardia. Apnea (choice B) refers to the temporary cessation of breathing, not related to heart rate. Bradycardia (choice C) is a condition of an abnormally slow heart rate, opposite of the given heart rate. Tachypnea (choice D) is an abnormally rapid breathing rate, not related to heart rate.
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