HESI A2
HESI A2 Biology Practice Test Questions
Question 1 of 5
How is the plasma membrane arranged?
Correct Answer: D
Rationale: The plasma membrane is a phospholipid bilayer, meaning it consists of two layers of phospholipid molecules. This arrangement forms a barrier that separates the cell from its external environment. The hydrophobic tails of the phospholipids face inward, while the hydrophilic heads face outward. This structure allows the membrane to control the movement of substances in and out of the cell. Choices A and B are incorrect as the membrane is not solely made of proteins. Choice C is incorrect as the membrane consists of a double layer of phospholipids, not a single layer.
Question 2 of 5
If a hard-boiled egg is placed in a beaker of saltwater, what will happen to the egg?
Correct Answer: B
Rationale: The correct answer is B because of osmosis. Saltwater has a higher concentration of solute than the egg, causing water to move out of the egg, leading to shrinkage. A is incorrect as the egg will lose water, not expand. C is incorrect as there will be a change due to osmosis. D is incorrect as an effect will occur.
Question 3 of 5
Tundra, savannas, grasslands, deserts, and rainforests are examples of what?
Correct Answer: D
Rationale: The correct answer is D: Biomes. Biomes are large geographical areas characterized by specific climate, vegetation, and animal life. Tundra, savannas, grasslands, deserts, and rainforests are all examples of biomes. They are classified based on factors like temperature, precipitation, and flora/fauna. Biomasses (A) refer to the total mass of living organisms in a given area. Biospheres (B) are the regions of the Earth where life exists. Biodiversity (C) refers to the variety and variability of life forms in a specific habitat, not the specific types of habitats themselves.
Question 4 of 5
A child is sick. They have a body temperature that exceeds 37�C. The body senses this and begins to sweat in order to lower the temperature. What is this an example of?
Correct Answer: B
Rationale: Failed to generate a rationale after 5 retries.
Question 5 of 5
Which one of the following best describes the function of a cell membrane?
Correct Answer: A
Rationale: The correct answer is A: It controls the substances entering and leaving the cell. The cell membrane acts as a selective barrier, regulating the passage of molecules in and out of the cell. It does this through various mechanisms such as protein channels and pumps. This function is crucial for maintaining cellular homeostasis and ensuring the cell's survival. Summary: - B: It maintains the cell's shape: The cell membrane does contribute to the cell's shape but this is not its primary function. - C: It controls the substances entering the cell: This is partially correct, but the cell membrane also controls substances leaving the cell. - D: It supports the cell's structures: While the cell membrane provides some structural support, its main function is controlling the movement of substances.
Similar Questions
Join Our Community Today!
Join Over 10,000+ nursing students using Nurselytic. Access Comprehensive study Guides curriculum for HESI A2-HESI A2 and 3000+ practice questions to help you pass your HESI A2-HESI A2 exam.
Subscribe for Unlimited Access