HESI A2
HESI A2 Practice Test Biology
1. What is the role of tRNA during protein synthesis?
- A. Carries amino acids to the ribosome
- B. Links nucleotides together
- C. Copies DNA sequences
- D. Replicates genetic material
Correct answer: A
Rationale: During protein synthesis, tRNA plays the crucial role of carrying amino acids to the ribosome. This process ensures that the correct amino acids are brought to the ribosome according to the mRNA sequence. Choice B, linking nucleotides together, refers to the role of RNA polymerase in transcription, not tRNA. Choice C, copying DNA sequences, is the function of DNA polymerase during DNA replication, while choice D, replicating genetic material, is an overarching function of DNA replication, not specific to tRNA's role in protein synthesis.
2. What does 'Contour' mean?
- A. Flat area
- B. Shape or outline of something
- C. Volume of a structure
- D. Height of a structure
Correct answer: B
Rationale: The term 'Contour' specifically refers to the shape or outline of something. In art and geography, contours are used to represent the outline or shape of an object or landform, making choice B the correct definition. Choice A, 'Flat area,' is incorrect as it does not capture the essence of contour which is about the shape or outline. Choice C, 'Volume of a structure,' is unrelated to the concept of contour. Choice D, 'Height of a structure,' is also incorrect as contour is more about the shape and not the height of an object.
3. The spleen is part of which system?
- A. nervous system
- B. integumentary system
- C. lymphatic system
- D. urinary system
Correct answer: C
Rationale: The correct answer is C: lymphatic system. The spleen is a vital organ in the lymphatic system, responsible for filtering blood, producing and storing white blood cells, and aiding the body in fighting infections. The lymphatic system is crucial for maintaining the body's immune defenses and fluid balance. Choices A, B, and D are incorrect because the spleen is not part of the nervous system, integumentary system, or urinary system.
4. What is the best description for an assembled product in the following sentence? The provisions apply to any “electronic product,” which is defined as any manufactured or assembled product (or component, part, or accessory of such product) that, when in operation, (i) contains or acts as part of an electronic circuit and (ii) emits electronic product radiation.
- A. A product that is collected
- B. A product that is legislated
- C. A product that is put together
- D. A product that is agreed upon
Correct answer: C
Rationale: The best description for an assembled product in the given sentence is "a product that is put together," as assembling refers to the action of putting together various parts or components to create a finished product. The sentence mentions that the provisions apply to any "assembled product" along with components, parts, or accessories of the product. Choice A, 'A product that is collected,' is incorrect as collecting does not imply assembling. Choice B, 'A product that is legislated,' is incorrect as legislation is related to laws and regulations, not the physical process of assembling. Choice D, 'A product that is agreed upon,' is incorrect as agreeing upon a product is unrelated to the physical act of assembling it.
5. How many grams are in 8 kilograms?
- A. 80000 grams
- B. 800 grams
- C. 80000 grams
- D. 8000 grams
Correct answer: D
Rationale: To convert kilograms to grams, you multiply by 1,000 since there are 1,000 grams in a kilogram. Therefore, 8 kilograms = 8 x 1,000 = 8,000 grams. The correct answer is 8,000 grams, which is option D. Choices A and C are incorrect as they incorrectly multiply by 10,000 instead of 1,000. Choice B is incorrect as it divides 8 by 10 instead of multiplying by 1,000.
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