Unit 4 Test Preparation

True or false- Mitochondria and the nucleus contain membranes.

• True

• False

Scientists hypothesize two organelles evolved from prokaryotic organisms that were engulfed by other organisms. Which organelles are these?

• nucleus and ribosomes

• chloroplasts and mitochondria

• lysosomes and vacuoles

Which organelle produces sugars through photosynthesis?

• vacuole

• lysosome

• chloroplasts

Which of the following are two major components of the cell membrane?

• phospholipids and amino acids

• amino acids and carbohydrates

• phospholipids and proteins

Why do cells need to be small?

• More surface area to volume ratio

• Less surface area to volume ratio

• Cells cannot grow

What is the passive transport of water across a selectively permeable membrane?

• active transport

• facilitated diffusion

• osmosis

Which of the following is NOT a part of cell theory?

• Cells are the basic unit of structure and function.

• Few cells are able to grow and reproduce.

• All cells come from pre-existing cells.

When solutions are isotonic, what happens to the solutes?

• solutes only move into the cell

• solutes only move out of the cell

• solutes move in both directions because the solutions are at equilibrium

What specialized structures are found in eukaryotes, but not prokaryotes?

• organelles

• lipids

• DNA

Which organelle stores DNA and acts as a control center of the cell?

• nucleus

• cell membrane

• ribosome