are small, round organelles enclosed by single membranes. They carry out reactio

Question

are small, round organelles enclosed by single membranes. They carry out reactions that oxidize fatty acids and amino acids and detoxification of poisons. A) Lysosomes B) Centrosomes C) Peroxisomes D) Vacuoles 2 Which of the following statements about the cytoskeletal elements is INCORRECT? A) They contribute to some cellular movement B) They are made of proteins C) They are present only in eukaryotes D) They support the cell membrane 3 This junction is made of cadherin proteins A) Gap B) Plasmodesmata C) Tight D) Desmosomes 4 In which organelle Ca+ ions are stored, lipids and carbohydrates are synthesized? A) Peroxisomes B) Smooth endoplasmic reticulum C) Rough endoplasmic reticulum D) Ribosomes

Explanation / Answer

1. C. Peroxisomes

Peroxisomes are responsible for oxidation of fatty acids and amino acids, and detoxification of poisons.

2.C. They are present only in eukaryotes.

Cytoskeleton elements are present in all domains of life, both prokaryotes and eukaryotes.

3. D. Desmosomes

Desmosomes are the cell junctions which connect cells by means of cadherins.

4. C. Smooth endoplasmic reticulum (SER)

SER is responsible for lipid synthesis, storage of Ca2+ ions and synthesis of carbohydrates.

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