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MDCAT
Biology
2018

Biology · Cell Structure and Function

Work through this past-paper style MCQ, then read the full explanation. Practice more biology questions on mMCQ with adaptive practice and topic analytics.

Question

In humans,________ is responsible for producing cell's hydrogen peroxide.

Options
  • A

    Lysosomes

  • B

    Mitochondria

  • C

    Peroxisomes

  • D

    glyoxysome

Explanation

The main chemical produced by oxidation in peroxisomes is the very cytotoxic (cell toxic) hydrogen peroxide. Fortunately peroxisomes produce copious amounts of the enzyme catalase and this helps break down hydrogen peroxide to water and oxygen.

Lysosomes are cytoplasmic organelles that are found in most eukaryotic cells. It is bounded by a single membrane and are simple sac rich in acid phosphatase and several other digestives or hydrologic enzymes.

OPTION B: Mitochondria is called the powerhouse of the cell. They contain DNA and ribosome; thus, some proteins may be synthesized in them.

The main chemical produced by oxidation in peroxisomes is the very cell's toxic hydrogen peroxide. Databases are involved in the breakdown of hydrogen peroxide into water and oxygen.

Glyoxisomes are present only during a short period in the germination of lipid-rich seeds and are absent in lipid-poor seeds such as peas. 

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Tagged under Biology · Cell Structure and Function · 2018