Cell Biology

Which of the following macromolecule(s) constitute plasma membrane?

• Proteins and lipids

• cholesterol and proteins

• Carbohydrates and nucleic acids
• lipids, proteins, and carbohydrates

Lipids and Proteins in the membrane are held together by which of the following interactions?

• Covalent bonds
• Van der Waals forces
• Hydrophobic interactions
• Ionic bonds

How are proteins destined for the secretory pathway?

• Proteins are directly released into the cytoplasm without any targeting signals.
• Proteins are tagged with a carbohydrate chain to enter the secretory pathway.
• Proteins are synthesized in the mitochondria for the secretory pathway.
• Proteins are directed to the secretory pathway by a signal peptide that targets them to the endoplasmic reticulum.

Which of the following protein is involved in retrograde transport?

• kinesin
• myosin
• tubulin
• dynein

Which of the following is the retrieval signal of ER proteins?

• KDEL
• KDE
• KEDL
• DELK

Which of the following proteins aid in membrane fusion?

• Transport proteins and channels
• Receptors and enzymes
• SNAREs and fusogenic proteins
• Structural proteins and scaffolds

What is TOM/TIM complex?

• A signaling pathway for apoptosis in cells
• The TOM/TIM complex is a protein import system in mitochondria.

• A type of mitochondrial enzyme involved in ATP synthesis
• A method for DNA replication in mitochondria

In which of the following organelle protein transport, Ran-GTP is involved?

• Golgi Apparatus
• Nucleus
• Mitochondria
• Endoplasmic Reticulum

How are G proteins activated?

• G proteins are activated by the binding of calcium ions.
• G proteins are activated by the release of ATP from the cell.
• G proteins are activated by the exchange of GDP for GTP upon receptor-ligand binding.
• G proteins are activated by the phosphorylation of GDP.

Which of the following is not a second messenger(s)?

• Cyclic AMP
• Calcium ions
• Inositol trisphosphate
• Insulin