HESI A2
HESI A2 Biology Practice Test
1. How many bones are included in the human skeletal system?
- A. 412
- B. 103
- C. Over 300
- D. 206
Correct answer: D
Rationale: There are 206 bones in the human skeletal system. This includes bones in the skull, spine, ribs, arms, legs, hands, and feet. The correct answer is 206 because that is the standard number of bones in an adult human body. Choices A, B, and C are incorrect as they do not reflect the accurate count of bones in the human skeletal system.
2. What is the process by which cells divide to form two identical daughter cells?
- A. Mitosis
- B. Meiosis
- C. Binary Fission
- D. Cellular Division
Correct answer: A
Rationale: The correct answer is A, Mitosis. Mitosis is the process in which a cell divides to form two identical daughter cells. Choice B, Meiosis, is a type of cell division that results in four non-identical daughter cells with half the number of chromosomes. Choice C, Binary Fission, is a form of asexual reproduction used by prokaryotic organisms. Choice D, Cellular Division, is a general term that encompasses various processes of cell division, but specifically, mitosis refers to the division resulting in two identical daughter cells.
3. The force per unit area exerted against a surface by the weight of air above that surface in the Earth's atmosphere is the ______.
- A. Atmospheric pressure
- B. Barometric density
- C. Aneroid pressure
- D. Barometric pressure
Correct answer: A
Rationale: Atmospheric pressure is the correct term for the force per unit area exerted against a surface by the weight of air above that surface in the Earth's atmosphere. It is commonly measured in units such as pascals, millibars, or inches of mercury. Barometric density and aneroid pressure are not accurate descriptions for this phenomenon. Barometric density refers to the density of the atmosphere at a particular location, while aneroid pressure is linked to a type of barometer but not a comprehensive term for the force exerted by the weight of air.
4. What is the correct order of the hierarchy of levels in the biological classification of organisms?
- A. Kingdom, phylum, class, order, family, genus, and species
- B. Phylum, kingdom, class, order, family, genus, and species
- C. Order, phylum, class, kingdom, family, genus, and species
- D. Kingdom, phylum, order, class, family, genus, and species
Correct answer: A
Rationale: The correct order of the hierarchy of levels in the biological classification of organisms is Kingdom, Phylum, Class, Order, Family, Genus, and Species. This order is based on the Linnaean system of classification, with each level representing a progressively more specific grouping of organisms. Choice B is incorrect because it starts with Phylum instead of Kingdom. Choice C is incorrect as it places Order before Phylum. Choice D is incorrect because it does not follow the correct order of the biological classification hierarchy.
5. Which part of the plant produces pollen?
- A. Anther
- B. Style
- C. Stigma
- D. Pistil
Correct answer: A
Rationale: The anther is the part of the flower that produces pollen. It is located at the tip of the stamen, the male reproductive organ of a flower. The anther contains pollen sacs where pollen grains are produced. The style is the part of the pistil that connects the stigma to the ovary, playing a role in pollen tube growth. The stigma is the part of the pistil that receives pollen during fertilization. The pistil is the female reproductive organ of a flower, consisting of the stigma, style, and ovary, and does not produce pollen.
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