Question

Animal cells are
A. Round and irregular in shape
B. Round or rectangular in shape
C. Regular and rectangular in shape
D. Irregular and square in shape

Answer 1

Hint: Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. Unlike plant cells, animal cells lack cell walls.

Complete answer: Animal cells are eukaryotic cells, surrounded by the plasma membrane. It contains membrane-bound nuclei and organelles. Unlike eukaryotic cells of plants and fungi, animal cells do not have cell walls. The main difference between animal cells and plant cells is that plant cells have cell walls, while animal cells lack cell walls. The cell wall made of cellulose gives plant cells rigidity, thus forming a fixed rectangular shape. Animal cells lack rigidity, so they tend to have round and irregular shapes. The appearance of animal cells often changes greatly.

The cell wall allows high pressure to build inside the plant cell without breaking. Therefore, plant cells can receive a large amount of liquid through osmosis without breaking. Animal cells that only have membranes that restrict access to the cells tend to rupture if they absorb too much water. Cells provide structure to the human body, absorb nutrients from food, convert these nutrients into energy, and perform specialized functions. Cells also contain the body's genetic material and can replicate itself.
Thus, the correct answer is option A.

Note: The longest cells in the human body are motor neurons. They can reach up to 4.5 feet (1.37 meters) in length and extend from the lower spinal cord to the big toe. Red blood cells carry oxygen around the body. They are created in the bone marrow of your bones.