The diagram below represents a cell in the human body. Which statement concerning the structures within this cell is accurate?
a
Structure 1 is a chloroplast that carries out photosynthesis.
b
Structure 2 is a vacuole that contains DNA.
c
Structure 3 is a mitochondrion, where cellular respiration takes place.
d
Structure 4 is the cell membrane, which provides rigid, inflexible, impermeable support for the cell.
c
Structure 3 is a mitochondrion, where cellular respiration takes place.
The accurate statement concerning the structures within this cell is option c: Structure 3 is a mitochondrion, where cellular respiration takes place.
To determine which statement is accurate, let's analyze each option and the given diagram:
a) Structure 1 is a chloroplast that carries out photosynthesis.
Chloroplasts are responsible for photosynthesis, which is the process of converting light energy into chemical energy to synthesize glucose. However, the diagram does not show any structures that resemble chloroplasts, especially considering that the question refers to a cell in the human body. Therefore, option (a) is not accurate.
b) Structure 2 is a vacuole that contains DNA.
Vacuoles are membrane-bound organelles that primarily store water, ions, and other substances. However, DNA is typically found within the nucleus of a cell, which is not depicted in the given diagram. Therefore, option (b) is not accurate.
c) Structure 3 is a mitochondrion, where cellular respiration takes place.
Mitochondria are responsible for cellular respiration, which is the process of converting glucose into ATP (adenosine triphosphate), the main energy currency of cells. The structure labeled as "3" closely resembles the structure of mitochondria, indicating that option (c) is accurate.
d) Structure 4 is the cell membrane, which provides rigid, inflexible, impermeable support for the cell.
The cell membrane is a semi-permeable barrier that surrounds and protects the cell. It is responsible for regulating the passage of substances in and out of the cell. The structure labeled as "4" in the diagram appears to match the characteristics of a cell membrane. Therefore, option (d) is accurate.
In conclusion, the accurate statement regarding the structures within this cell is:
c) Structure 3 is a mitochondrion, where cellular respiration takes place.
d) Structure 4 is the cell membrane, which provides rigid, inflexible, impermeable support for the cell.