A-level Biology Cells Questions With Complete Solutions.

A-level Biology Cells Questions With Complete Solutions. Name the main biological molecule in: The Cell Membrane The Cell Wall -Phospholipids -Murein Has stacked membranes arranged in parallel and contains DNA. Chloroplasts Is an organelle and is not surrounded by two membranes. Golgi Apparatus Human breast milk is produced and secreted by gland cells. These gland cells have adaptations that include many mitochondria and many Golgi vesicles. The milk contains a high concentration of protein. Explain the role of these cell adaptations in the production and secretion of breast milk. Mitochondria release energy in the form of ATP for vesicle transportation. Golgi Vesicles transport the protein out of the cell. Explain the advantages of lipid droplet and micelle formation. The droplets have a large surface area which increases the rate of hydrolysis. The micelles are smaller so are able to pass through the membrane carrying the products. Suggest how the Golgi apparatus is involved in the absorption of lipids. It modifies and processes triglycerides and combines them with proteins, forms vesicles and releases them via exocytosis. In cell fractionation, why is the solution ice cold? Stops enzyme activity to prevent digestion of organelles Is RNA in a Virus or Bacterium? Both Is a cell wall in a Virus or Bacterium? Bacterium Are enzyme molecules in a Virus or Bacterium? Both Is a capsid in a Virus or Bacterium? Virus Which of cell membrane, cell wall and nucleus is a is white blood cell present in? Cell surface membrane and nucleus Which of cell membrane, cell wall and nucleus is a is bacterial cell present in? Cell wall and cell surface membrane Some scientists support the theory that mitochondria are organelles that evolved from prokaryotic cells. (i) Give one piece of evidence that supports the theory that mitochondria evolved from prokaryotic cells. Prokaryotic cells have circular DNA What is the advantage to cells of having mitochondria? The respire aerobically so provide energy in the form of ATP. Describe how temporary mounts are made. Thin slice/section; Stain with iodine Add cover slip; Describe how the scientist could have used the temporary mounts of leaves to determine the mean number of chloroplasts in mesophyll cells of a leaf. 1. Take a large number of cells 2. Count number of chloroplasts; 3. Divide number of chloroplasts by number of cells In which organelle does protein synthesis take place? The RER Describe how the RER is involved in the production of enzymes.