Cell: Pre-Test

What is the function of the organelle identified as #6 in the picture (it is mostly brown, folded over, and is in the lower right part of the cell)?

• packages proteins for transport out of the cell

• movement

• houses the cells DNA

• house the digestive enzyme

This part of the cell stores wastes, water or food.

• mitochondria

• lysosome

• vacuole

• ribosome

Unfinished proteins transported from the ER are modified in the cell's

• smooth ER.

• Golgi apparatus.

• nucleus.

• ribosomes.

Which type of molecule makes up the double layer of a cell membrane?

• protein

• lipid

• nucleic acid

• carbohydrate

The sequence of ________________ in a DNA molecule determines the protein that will be produced.

• sugars

• lipids

• proteins

• nucleotides

Reusable, complex proteins that promote chemical reactions within cells are called

• steroids.

• enzymes.

• regulators.

• inhibitors.

What would you expect to happen to the egg in the distilled water?

• It will grow bigger as water enters the cell.

• The egg will stay the same size as the amount of fluid leaving and entering the cell are at equilibrium.

• It will shrink as the yolk inside the cell shrinks.

• The egg will regrow its hard, outer shell.

What type of solution is the distilled water?

• isotonic

• hypotonic

• hypertonic

Which cell process requires energy expenditure?

• phagocytosis

• passive transport

• facilitated diffusion

• osmosis

The figure shows a classic experiment that demonstrates the principle of osmosis. The left side of the U-tube is filled half-way with 10% red sugar water. Into the tube on the right, distilled water is poured until it is even with the red sugar water. A semi-permeable membrane is placed in the brown area. Predict what will happen in the U-tube after several hours.

• The left side of the tube will remain red, but rise in volume, as the right side of the tube falls in volume. The distilled water will dilute the sugar water.

• Both sides will become 5% red sugar water, and will be at equal marks on the U-tube given enough time.

• The membrane in the middle will melt away and both sides will mix.

• The left side will remain red, but it will fall. The right side will remain clear, but it will rise, as water moves from the 10% sugar water to the distilled water.