HESI A2
HESI A2 Version 1 Biology Questions
Question 1 of 5
In the human life cycle, only sperm and eggs have which number of chromosomes?
Correct Answer: D
Rationale: In humans, sperm and egg cells are haploid, meaning they contain half the number of chromosomes (23) compared to diploid cells (46). This reduction in chromosome number is essential for sexual reproduction, allowing the formation of a diploid zygote upon fertilization. Haploid cells carry only one set of chromosomes, which is necessary for genetic diversity and the fusion of genetic material during fertilization.
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
In the human life cycle, only sperm and eggs have which number of chromosomes?
Correct Answer: D
Rationale: In humans, sperm and egg cells are haploid, meaning they contain half the number of chromosomes (23) compared to diploid cells (46). This reduction in chromosome number is essential for sexual reproduction, allowing the formation of a diploid zygote upon fertilization. Haploid cells carry only one set of chromosomes, which is necessary for genetic diversity and the fusion of genetic material during fertilization.
Question 4 of 5
If the zygomatic arch is broken, where is the fracture located?
Correct Answer: A
Rationale: The zygomatic arch, also known as the cheekbone, is a bony structure on the side of the face. A fracture in this area is classified as a facial fracture, making the correct location for the fracture in the face.
Question 5 of 5
Which set is correctly listed for characteristic chromosome number, and most of their cells have a complete set of these chromosomes?
Correct Answer: D
Rationale: The correct order from largest to smallest is Phylum, Order, Genus, Species. In biological classification, the hierarchy of taxonomic ranks is structured such that phylum is the broadest category, followed by order, genus, and species, which is the most specific. When looking at the characteristic chromosome number, most cells have a complete set of chromosomes, and this order aligns with the genetic similarity and differences observed in organisms.