🧬 Biology · Cells
Cell Organelles and Their Jobs: true or false
Decide fast, then read the reason. Wrong answers are the best teachers, so every statement explains itself.
All statements and answers
The nucleus is the brain of the cell because it thinks and makes decisions.
✗ False. The nucleus stores the DNA instructions and copies the ones that are needed. It does not think or decide.
Ribosomes are found in both prokaryotic and eukaryotic cells.
✓ True. Every cell needs to build proteins, so every cell has ribosomes. Prokaryotes lack a nucleus and membrane-bound organelles, but they have ribosomes.
The Golgi apparatus is where amino acids are joined together to make proteins.
✗ False. Ribosomes join amino acids into proteins. The Golgi apparatus modifies, sorts and packs proteins that were made elsewhere.
The rough ER looks rough because ribosomes are attached to its surface.
✓ True. The ribosomes studding the ER membrane give it its rough look.
Plant cells have mitochondria.
✓ True. Plant cells use mitochondria to release the energy in sugar as ATP. They have mitochondria as well as chloroplasts (when they have chloroplasts).
Mitochondria create new energy for the cell.
✗ False. Energy is not created. Mitochondria convert the chemical energy in food molecules into ATP, and some energy is lost as heat.
A cell wall and a cell membrane are two names for the same structure.
✗ False. They are different. The membrane is a thin boundary around every cell, and a cell wall is a rigid layer outside the membrane in plants, fungi, most bacteria, most archaea and some protists.
Lysosomes contain digestive enzymes.
✓ True. Lysosomes are membrane-bound sacs of digestive enzymes that break down worn-out cell parts and other materials.
Chloroplasts are found in animal cells.
✗ False. Chloroplasts are found in plant cells and algae, where they carry out photosynthesis. Animal cells do not have them.
The DNA of a prokaryotic cell is enclosed in a nucleus.
✗ False. Prokaryotic cells have no nucleus. Their DNA is in the cytoplasm.
Vesicles carry materials from one part of the cell to another.
✓ True. Vesicles are small membrane-bound sacs that transport cargo, for example from the ER to the Golgi apparatus and from the Golgi to the cell membrane.
The nucleolus is a region inside the nucleus where parts of ribosomes are made.
✓ True. The nucleolus makes and assembles the parts of ribosomes, which then leave the nucleus.
Every cell wall is made of cellulose.
✗ False. Plant cell walls are mostly cellulose, but fungal walls contain chitin and most bacterial walls contain peptidoglycan.
The cytoskeleton gives a cell its shape and helps move organelles and vesicles around inside it.
✓ True. Protein fibers of the cytoskeleton support the cell and act as tracks for moving materials.