All cells regardless of size share all of the following characteristics except...
A. have a cytoplasm
B. have a nucleus
C. have a plasma membrane
D. have ribosomes
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The correct answer is B. have a nucleus.
Explanation:
All cells, regardless of size, do share the following characteristics:
- They have a cytoplasm, which is the gel-like substance that fills the cell.
- They have a plasma membrane, which acts as a protective barrier and regulates the movement of materials into and out of the cell.
- They have ribosomes, which are responsible for protein synthesis.
However, not all cells have a nucleus. There are two types of cells: eukaryotic cells and prokaryotic cells. Eukaryotic cells, which include cells in plants, animals, fungi, and protists, have a nucleus that houses their genetic material. On the other hand, prokaryotic cells, which include bacteria and archaea, lack a nucleus and have their genetic material floating freely in the cytoplasm. Therefore, the correct answer is B. have a nucleus.
To determine which characteristic is not shared by all cells regardless of size, let's analyze each option:
A. Have a cytoplasm: The cytoplasm is the gel-like substance found inside the cell. It contains organelles, such as the nucleus, mitochondria, and ribosomes. Most cells have a cytoplasm, so this characteristic is shared by many cells.
B. Have a nucleus: The nucleus is an organelle that contains the cell's DNA and controls the cell's activities. Most cells have a nucleus; however, there are a few exceptions. For example, red blood cells in humans do not have a nucleus. Therefore, this characteristic is not always shared by all cells.
C. Have a plasma membrane: The plasma membrane, also known as the cell membrane, is a thin layer that surrounds the cell. It acts as a barrier, controlling the entry and exit of substances into and out of the cell. All cells have a plasma membrane, making this characteristic shared by all cells.
D. Have ribosomes: Ribosomes are small organelles responsible for protein synthesis. They can be found in all cells, regardless of size, making this characteristic shared by all cells.
Therefore, the characteristic that is not shared by all cells regardless of size is B. They do not all have a nucleus.