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Peroxisome Structure and Function

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Questions and Answers

What is the size range of peroxisomes mentioned in the text?

0.5 to 1.2 µm (correct)

1 to 2 µm

0.5 to 1.5 µm

0.2 to 0.8 µm

Which enzyme present in peroxisomes helps eliminate hydrogen peroxide?

Kinase

Protease

Catalase (correct)

Lipase

What is the substance produced when peroxisomes oxidize specific organic substrates?

Hydrogen peroxide (H2O2) (correct)

Water (H2O)

Oxygen gas (O2)

Carbon dioxide (CO2)

Which type of fatty acids are preferentially oxidized by peroxisomal enzymes?

Long-chain fatty acids (18 carbons and longer) Signup and view all the answers

Where are ribosomes typically found according to the text?

Cytosol Signup and view all the answers

What is the staining property of polyribosomes (polysomes) mentioned in the text?

Stained darkly with hematoxylin, methylene, and toluidine blue Signup and view all the answers

What is the primary function of proteasomes in cells?

Destroying impaired or nonfunctional polypeptides Signup and view all the answers

What is the consequence of defects in protein quality control of proteasomes or cells?

Accumulation of large protein aggregates in damaged cells Signup and view all the answers

Which structure acts as the microtubule-organizing center for the mitotic spindle?

Centrosome Signup and view all the answers

What is the composition of microtubules found in eukaryotic cells?

α and β tubulin protein subunits Signup and view all the answers

What is a key role of microfilaments in cellular activities?

Allowing cell movement and contraction activities Signup and view all the answers

How do centrioles in a centrosome position themselves relative to each other?

At right angles Signup and view all the answers