Biology-Cells

What is E pointing to?

• a protein channel

• a protein pump

• a carbohydrate chain

• the fatty end of a phospholipid molecule

Large molecules would travel through which portion of this diagram?

• A

• B

• C

• E

Water cannot fit through the phospholipid membrane because...

• water molecules are way too big

• water molecules are way too small

• water molecules are non-polar (not charged)

• water molecules are polar (charged)

What happens to an animal cell that is placed in very salty (hypertonic) solution?

• nothing

• the cell will swell up with water

• the cell will shrink just a little

• the cell will crenate (shrink completely, losing all water)

What happens to a plant cell placed in distilled water (hypotonic solution)

• nothing

• the plant cell will swell and burst

• the plant cell will swell but only stiffen

• the plant cell will crenate (shrivel up)

Bacteria are...

• prokaryote cells

• eukaryote cells

plant cells are...

• prokaryote cells

• eukaryote cells

The key difference between a prokaryote and eukaryote cell is...

• one has a cell membrane, the other does not

• one has a nucleus, the other does not

• one has DNA, the other does not

• one has ribosomes, the other does not

Ribosomes are produced by the nucleus. What is the function of a ribosome once it is finished?

• to create DNA

• to transport water molecules

• to power the protein pumps

• to assemble protein molecules

Cells that need a lot of energy need more of which organelle?

• nucleus

• golgi body

• mitochondria

• vacuoles

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