HESI A2
HESI A2 Version 1 Biology Questions
Question 1 of 5
Where in the cell does the Krebs cycle take place?
Correct Answer: A
Rationale: The Krebs cycle, also known as the citric acid cycle, occurs in the mitochondrion of eukaryotic cells. This cycle is a vital component of cellular respiration, where it is responsible for converting acetyl-CoA into ATP, NADH, and FADHā‚‚, contributing to energy production within the cell. The mitochondrion is often referred to as the powerhouse of the cell due to its role in generating energy through processes like the Krebs cycle.
Question 2 of 5
What type of cell primarily makes up animals?
Correct Answer: A
Rationale: Animals are composed primarily of eukaryotic cells, characterized by a defined nucleus and membrane-bound organelles. Eukaryotic cells are complex and serve as the basis for multicellular organisms such as animals, contrasting with prokaryotic cells that lack a defined nucleus and organelles.
Question 3 of 5
Which is an example of the correct organizational hierarchy for a wolf?
Correct Answer: B
Rationale: The correct organizational hierarchy in biology follows a specific order from smallest to largest. It starts with DNA (genetic material), followed by blood cells (basic units of life), then muscle tissue (a collection of cells), followed by the heart (an organ), then the circulatory system (a system of organs), and finally the whole organism, the wolf. Therefore, the correct sequence for the organizational hierarchy for a wolf is DNA, blood cell, muscle tissue, heart, circulatory system, and wolf.
Question 4 of 5
Which cellular appendage enables cells to move through their environments?
Correct Answer: A
Rationale: "Flagellum" is a whip-like appendage that allows certain cells to move through their environment.
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.