HESI A2
HESI A2 Version 1 Biology Questions
Question 1 of 5
Which cell organelle can be functionally compared to a door of a house?
Correct Answer: B
Rationale: The cell membrane can be likened to a door of a house because it functions to regulate what enters and exits the cell, maintaining internal balance (homeostasis) and safeguarding the cell's interior. Just as a door controls access to a house, the cell membrane controls the passage of substances into and out of the cell, thereby playing a crucial role in maintaining the cell's integrity and functionality.
Question 2 of 5
Which term means alternate forms of a gene for the same trait?
Correct Answer: B
Rationale: Alleles are different versions of a gene that can exist for a given trait. For example, a gene for flower color may have a red allele and a white allele, representing the alternate forms of that gene. Genotypes refer to the genetic makeup, while phenotypes refer to the observable traits.
Question 3 of 5
What type of bond in the DNA nucleotide base holds the strands together?
Correct Answer: A
Rationale: Hydrogen bonds are the type of bonds that hold the two strands of DNA together by connecting complementary nitrogenous bases (adenine with thymine and cytosine with guanine). These weak bonds allow the DNA strands to separate during replication and transcription while providing stability to the overall structure of the DNA molecule.
Question 4 of 5
How does the concentration of solutes in a hypertonic solution compare to the cell's?
Correct Answer: C
Rationale: In a hypertonic solution, the concentration of solutes is higher compared to the cell's interior. This causes water to move out of the cell to balance the solute concentrations, resulting in the cell shrinking. Therefore, the correct answer is that the solute concentration is higher in a hypertonic solution than inside the cell.
Question 5 of 5
What is the first step in the process of respiration?
Correct Answer: D
Rationale: The correct answer is Glycolysis. Glycolysis is the initial step in cellular respiration where glucose is broken down into pyruvate, producing a small amount of ATP and NADH in the cytoplasm. This step is crucial as it initiates the breakdown of glucose, setting the stage for further energy production in subsequent stages like the Krebs cycle and electron transport chain.