cell biology

What are the subunits of prokaryotic ribosomes?

• 50S, 30S

• 60S, 40S

• 70S, 30S

• 60S, 30S

Which of these structures of the phospholipid bilayer is correctly matched with its property?

• Phosphate head – hydrophobic

• Phosphate head – hydrophilic

• Lipid tail – hydrophilic

• Lipid tail – Polar

Which of these statements is not true regarding the cell membrane?

• The phosphate heads are polar

• It is a phospholipid monolayer

• The hydrophilic tails face outwards

• It contains integral proteins

Ribosomes are formed of:

• DNA & RNA

• RNA & protein

• DNA & protein

• RNA & amino acids

Which of the following is a microtubule organising center?

• Centrosome
• Golgi apparatus
• Mitochondria
• Nucleus

Which of the cytoskeletal elements help in cell motility?

• Intermediate filaments and ribosomes
• Actin filaments and lysosomes
• Microtubules and cell membranes
• Actin filaments and microtubules