Cell Biology Review

What is the best evidence that all life evolved from single cell organisms?

• Humans and Bacteria have some identical genes

• Humans have a lot of bacteria inside

• Mitochondria were originally bacteria

• All of these

Tags

NGSS.HS-LS4-1

Why are Phospholipids important molecules?

• They are an important source of Phosphorous

• They are hydrophilic so they can dissolve in water

• Their hydrophilic head and hydrophobic tail allow them to form lipid bilayers

• They are used to create cellular energy

Which of these is NOT part of Cell Theory?

• The cell is the smallest working units of life

• All living things are made of cells

• Cells can spontaneously arise

• Cells can only come from other cells via cell division

All cells have a cell membrane, no matter what type of cell

• True

• False

What is Osmosis?

• The way water moves from High Solute concentration to Low

• The way water moves from Low Solute concentration to High

What happened to the Naked Egg in a concentrated sugar solution?

• The water inside the egg moved out and the egg shrank

• The water outside the egg moved inside and the egg got bigger

• There was no change to the size of the egg

Tags

NGSS.HS-ESS2-5

What happens to the Naked Egg in pure water?

• Water goes into the egg and the egg expands

• Water goes out of the egg and the egg shrinks

• The egg doesn't change size at all

Large molecules (like carbohydrates, lipids, and proteins) cannot easily cross cell membranes via simple diffusion, so how do they get into and out of cells? (2 Answers)

• They have to be broken down into separate atoms

• Large molecules do not need to get into cells

• There are membrane proteins that facilitate transport

• Cells can use endocytosis

What's the difference between Osmosis and Diffusion?

• Osmosis refers only to the movement of liquid solvents like water

• Diffusion refers to any molecule moving from Low to High concentration

• There is no difference

Diffusion is the passive movement of any substance from High concentration to Low concentration

• True

• False