HESI A2
HESI A2 Version 1 Biology Questions
Question 1 of 5
Which disease is caused by a bacterium?
Correct Answer: B
Rationale: Strep throat is caused by the bacterium Streptococcus pyogenes. Unlike mumps, which is a viral infection, AIDS caused by the HIV virus, and the common cold usually caused by rhinoviruses, strep throat is specifically a bacterial infection that can be treated with antibiotics.
Question 2 of 5
In the presence of which molecule does aerobic respiration occur?
Correct Answer: A
Rationale: Aerobic respiration is a process that requires oxygen to efficiently convert glucose into carbon dioxide, water, and ATP. Oxygen plays a critical role in this metabolic pathway by acting as the final electron acceptor in the electron transport chain, allowing the production of ATP through oxidative phosphorylation. Therefore, oxygen is the essential molecule for aerobic respiration to take place.
Question 3 of 5
What structure in a plant cell acts as a barrier and provides support to the cell?
Correct Answer: D
Rationale: The cell wall is the correct answer. It acts as a rigid barrier that surrounds the plant cell membrane, providing structural support and protection. Plant cells have cell walls, unlike animal cells, which give them their shape and rigidity.
Question 4 of 5
How are viruses categorized?
Correct Answer: C
Rationale: Viruses are categorized based on several criteria, including size and shape, presence or absence of an outer envelope, and type of nucleic acid (DNA or RNA). Therefore, the most comprehensive answer is that all these factors are used for categorization.
Question 5 of 5
What substances make up the bilayer of the cellular membrane?
Correct Answer: B
Rationale: The cellular membrane consists of a bilayer of phospholipids. This phospholipid bilayer forms a flexible barrier around the cell, providing structural integrity and fluidity. While proteins and carbohydrates are also present in the cell membrane, the main component of the membrane's structure is the phospholipid bilayer, which plays a crucial role in maintaining the cell's functions.