30 Questions
Which organelle is similar to lysosomes but has a crystalloid core?
Peroxisome
What type of proteins are synthesized on free ribosomes and transported to peroxisomes?
Peroxisomal proteins
Which of the following cells do not have peroxisomes?
Erythrocytes
What is the function of peroxisomes?
Break down fatty acids
Which enzyme in peroxisomes converts H2O2 to H2O?
Catalase
How many different enzymes do peroxisomes contain?
50
What type of reactions do peroxisomes carry out?
Oxidation reactions
Which of the following is a substrate broken down by peroxisomes?
Fatty acid
What is the role of molecular oxygen in peroxisomal oxidative reactions?
To remove hydrogen atoms
Which organelle uses H2O2 to oxidize various substrates?
Mitochondria
Which organelle is responsible for cell division, cytokinesis, formation of cytoskeleton, and cell signalling pathways?
Centrosome
What is the structure that makes up a centriole?
Triplet microtubules
Which type of cell contains centrosomes?
Animal cells
What is the function of the pericentriolar material?
Nucleates the cytoplasmic microtubule array
Which protein is responsible for the formation of procentriole adjacent to the mother centriole?
PLK4
What is the role of centrioles in cell division?
Organization of the mitotic spindle
What determines the position of the nucleus and the spatial arrangement of cell organelles?
Centriole
What is the key regulatory protein for centriole duplication?
PLK4
What is the role of centrosomes in cellular organization?
Organizing microtubules in the cytoplasm
What determines the position of cilia and flagella in organisms?
Mother centriole
Which organelle is involved in the oxidation of fatty acids?
Mitochondria
What is the major product of the oxidation of fatty acids?
Acetyl CoA
Which organelle is responsible for the detoxification of various toxic molecules?
Peroxisomes
Which organelle converts hydrogen peroxide to water and oxygen?
Catalase
Which organelle participates in the synthesis of plasmalogens, an important membrane component in the heart and brain?
Peroxisomes
Which organelle is involved in the synthesis of cholesterol and dolichol?
Endoplasmic reticulum
Which organelle replicates by division to form new peroxisomes?
Peroxisomes
Which amino acid sequences are recognized by cytosolic receptors for peroxisomal protein import?
Peroxisome targeting signals (PTS)
Which protein is responsible for importing peroxisomal proteins into the peroxisome matrix?
Pex5
What happens in Zellweger syndrome, a genetic disorder related to peroxisomes?
Enzymes cannot be transported to peroxisomes
Test your knowledge on peroxisomes and centrioles in medical biology with this quiz. Explore the structure and function of peroxisomes, their similarities to lysosomes, and the synthesis and transport of peroxisomal proteins. Assoc. Prof. Özlem KURNAZ GÖMLEKSİZ provides valuable insights on these organelles.
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