Beta oxidation (breakdown of fatty acids) is purely an aerobic process. Which or

Question

Beta oxidation (breakdown of fatty acids) is purely an aerobic process. Which organelle do you predict is the site for beta oxidation? a. Smooth Endoplasmic Reticulum b. Mitochondria c. Plasma Membrane d. Cytosol Protein synthesis takes place in two cellular compartments, nucleus and cytosol. Translation (the second step in protein synthesis) requires the rough endoplasmic reticulum and ribosomes to create a peptide. Given this information, what cellular compartment does translation take place in? a. Nucleus b. Cytosol c. Nucleolus d. Extracellular fluid What type of chemical messenger would most likely cross the plasma membrane without necessarily having to bind a receptor? Choose all that apply. a. Lipophilic b. Lipophobic c. Hydrophobic d. Hydrophilic In down regulation, less receptors for a given ligand are present at the cell surface. In up-regulation, more receptors for that given ligand are added to the plasma membrane. By what process does this change to receptor number at the cell surface take place? a. Exoctyosis b. Endocytosis c. Endo and exocytosis d. Carrier proteins e. Channel proteins

Explanation / Answer

Answers:

9. (b) Mitochondria

Explanation:

Beta Oxidation of fatty acids occurs in the mitochondrial matrix since it contain enzymes responsible for the reactions of oxidative metabolism.

10. (b) Cytosol

Explanation:

Translation takes place on a ribosome in the cytoplasm.

11. (a) and (c) lipophilic, hydrophobic

Explanation:

Lipophilic, hydrophobic and non polar molecules can cross the plasma membrane without the requirement of a receptor protein.

12. (c) Endo and exocytosis

Explanation:

There are two ways through which a receptor can be downregulated, i.e, desensitization and downregulation through endocytosis and degradation. Similarly, upregulation is mediated by the process of exocutosis.

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