HESI A2
HESI A2 Version 1 Biology Questions
Question 1 of 5
The cellular membrane consists of a bilayer of which substances?
Correct Answer: B
Rationale: The cellular membrane is primarily composed of a phospholipid bilayer, forming the structure that regulates entry and exit.
Question 2 of 5
Which term means a group of similar cells combined to perform a common function?
Correct Answer: A
Rationale: The correct answer is 'Tissue.' Tissue is a group of similar cells that work collectively to carry out a specific function. These specialized cells combine to form tissues, which further combine to create organs. Organs then collaborate within systems in the body to maintain balance (homeostasis) and perform various functions such as digestion, circulation, and respiration.
Question 3 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 4 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 5 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.