HESI A2
HESI A2 Version 1 Biology Questions
Extract:
Question 1 of 5
Where does photosynthesis take place?
Correct Answer: C
Rationale: The correct answer is C: Chloroplast. Photosynthesis takes place in the chloroplast, specifically in the thylakoid membranes where the light-dependent reactions occur, and in the stroma where the light-independent reactions (Calvin cycle) take place. The chloroplast contains chlorophyll, the pigment responsible for capturing light energy needed for photosynthesis. Explanation for why the other choices are incorrect: A: Endoplasmic reticulum - The endoplasmic reticulum is involved in protein and lipid synthesis, not in photosynthesis. B: Mitochondrion - Mitochondria are responsible for cellular respiration, not photosynthesis. D: Golgi apparatus - The Golgi apparatus is involved in processing and packaging proteins for secretion, not in photosynthesis. In summary, the correct answer is C (Chloroplast) because it is the organelle where photosynthesis occurs due to the presence of chlorophyll and the necessary enzymes for the light-dependent and
Question 2 of 5
Which disease is caused by a bacterium?
Correct Answer: B
Rationale: Strep throat is caused by the bacterium Streptococcus pyogenes. Unlike mumps, which is a viral infection, AIDS caused by the HIV virus, and the common cold usually caused by rhinoviruses, strep throat is specifically a bacterial infection that can be treated with antibiotics.
Question 3 of 5
What cellular appendage enables cells to move through their environments?
Correct Answer: A
Rationale: The flagellum is a whip-like appendage found in certain cells like sperm cells and some bacteria, enabling them to move through their environments. It plays a crucial role in locomotion by allowing cells to swim or propel themselves in liquids, aiding in their movement and navigation.
Question 4 of 5
What process do sex cells undergo to reproduce?
Correct Answer: A
Rationale: Sex cells, also known as gametes, undergo the process of meiosis to reproduce. Meiosis is a specialized type of cell division that reduces the chromosome number by half, resulting in the formation of four genetically diverse haploid cells from a diploid cell. This reduction is essential for sexual reproduction to ensure genetic diversity in the offspring.
Question 5 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.