HESI A2
HESI A2 Version 1 Biology Questions
Question 1 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 2 of 5
What structure enables sperm cells to move effectively?
Correct Answer: D
Rationale: The flagellum is a whip-like structure that is crucial for sperm cells to swim and move effectively. It provides the necessary motility for sperm, allowing them to navigate through the female reproductive tract to reach the egg for fertilization. In contrast, structures like centriole, cilium, and centrosome do not have the propelling ability required for sperm cell movement.
Question 3 of 5
What is the purpose of cellular respiration?
Correct Answer: D
Rationale: The correct answer is D. The primary purpose of cellular respiration is to obtain energy in the form of ATP. During cellular respiration, glucose and other organic molecules are broken down to release energy in the form of ATP, which is crucial for various cellular functions and activities. This energy is used by cells to carry out processes such as growth, repair, movement, and maintaining homeostasis.
Question 4 of 5
Human cells need oxygen for respiration. What system of the body is responsible for transporting an oxygen molecule to different locations throughout the body?
Correct Answer: C
Rationale: The circulatory system is responsible for transporting oxygen throughout the body. It consists of the heart, blood vessels, and blood, which work together to deliver oxygen from the lungs to cells and tissues, facilitating cellular respiration. The skeletal system provides structural support and protection for the body but is not involved in oxygen transport. The lymphatic system helps maintain fluid balance and immune function, not oxygen transport. The respiratory system is responsible for gas exchange in the lungs but relies on the circulatory system to transport oxygen to cells and tissues.
Question 5 of 5
What part of a light microscope is used to hold the slide in place?
Correct Answer: D
Rationale: The correct answer is 'Stage clips.' Stage clips are utilized to secure the slide on the stage of a light microscope, ensuring it remains in position while examining the specimen. The base of the microscope provides stability, the arm supports the upper part of the microscope, and the rack stop restricts the movement of the stage. However, specifically, it is the stage clips that hold the slide in place during observations.