HESI A2
HESI A2 Biology Practice Test
1. Which is true of the term Phenotype?
- A. It is the genetic code
- B. Phenotype determines genotype
- C. Genotype determines phenotype
- D. Genotype, epigenetic factors, and environmental factors determine phenotype
Correct answer: D
Rationale: The term "phenotype" refers to the observable characteristics or traits of an organism, which are determined by a combination of genotype (genetic makeup), epigenetic factors (modifications to gene expression), and environmental factors (external influences and experiences). Genotype, epigenetic factors, and environmental factors all play a role in determining an individual's phenotype, making option D the correct statement. Options A, B, and C are incorrect because the phenotype is not the genetic code, the phenotype does not determine the genotype, and it is the genotype that influences the phenotype, not the other way around.
2. What is the definition of the word ENVIRONMENT?
- A. the major ideas of the quality of life
- B. the assistance found outside the family
- C. the elements inside and outside of a person
- D. the positive and negative aspects of a home
Correct answer: C
Rationale: The word 'environment' refers to the surroundings or conditions in which a person, animal, or plant lives or operates. It encompasses the elements both inside and outside of an individual, including physical, biological, social, and cultural factors. Option C, which mentions the elements inside and outside of a person, is the most accurate description of the word 'environment.' Choices A, B, and D do not capture the comprehensive nature of the term 'environment' and are therefore incorrect.
3. Select the meaning of the word 'intact' in the sentence: 'It is important that the bandage remain intact.'
- A. Dry
- B. Whole
- C. Uncovered
- D. Secure
Correct answer: B
Rationale: The correct answer is 'B: Whole'. In this context, 'intact' means undisturbed or whole, referring to the bandage being complete and not damaged. Choice A, 'Dry', is incorrect as it does not reflect the meaning of 'intact' in this sentence. Choice C, 'Uncovered', is also incorrect as 'intact' does not imply uncovered but rather complete. Choice D, 'Secure', is not the best fit as 'intact' in this context emphasizes the undamaged or whole nature of the bandage.
4. What is the meaning of the word duration as used in the last paragraph?
- A. Basis
- B. Extent
- C. Cure
- D. Solidity
Correct answer: B
Rationale: The word "duration" in the context of sleep refers to the length of time that children should sleep. It suggests a focus on the amount of sleep necessary for healthy development, making option B the correct choice as it aligns with the emphasis on recommended sleep hours for children.
5. What is the main function of the adrenal glands?
- A. Regulation of metabolism
- B. Production of bile
- C. Regulation of blood pressure
- D. Production of insulin
Correct answer: C
Rationale: The main function of the adrenal glands is to produce hormones like adrenaline and cortisol. These hormones play a crucial role in regulating blood pressure, metabolism, and the body's stress response. While the adrenal glands do have some impact on metabolism, their primary function is not the direct regulation of metabolism. They are not involved in the production of bile or insulin. Therefore, the correct answer is the regulation of blood pressure.
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