Do Now

What would most likely happen if the rabbit population was removed from the food chain grass —› rabbit —› fox?

• their would be more grass
• there would be less rabbits
• there would be more fox

Which is an example of a parasitic relationship?

• a bee pollinates a flower
• a tapeworm takes nutrients from a dog
• an orchid lives in a tree but does not harm the tree

In which type of relationship do both species benefit?

• parasitism
• mutualism
• commensalism

Barnacles grow on whales.  Whales give the barnacles a place to live but the barnacles do not help or harm the whale.  Which type of relationship is this?

• commensalism
• mutualism
• parasitiesm

The diagram models how a poison bonds to the active site of an enzyme. Which function is the enzyme MOST LIKELY unable to perform because of the attachment of the poison molecule?

• The release of stored chemical energy

• The donation of electrons to the substrate.

• The supply of activation energy for a reaction.

• The catalysis of the reaction with the substrate.

The graph shows how the activity of an enzyme change at different temperatures. Which statement BEST describes what happens to the enzyme when the temperature of the reaction increases to 63 degrees?

• The enzyme is used up and the reaction stops.

• The enzyme begins to decrease the rate of the reaction.

• The enzyme continues to increase the rate of the reaction.

• The enzyme changes shape and can no longer speed up the reaction.

A protein in a cell membrane changed its shape to move sodium and potassium ions against their concentration gradients. Which molecule was MOST LIKELY used by the protein as an energy source?

• ATP

• ADP

• Catalase

• Amylase

A sodium-potassium pump within a cell membrane requires energy to move a sodium and potassium ions into or out of a cell. The movement of glucose into or out of a cell does not require energy. Which statement BEST describes the movement of these materials across a cell membrane?

• Sodium and potassium ions move by active transport, and glucose moves by osmosis.

• Sodium and potassium ions move by active transport, and glucose moves by facilitated diffusion.

• Sodium and potassium ions move by facilitated diffusion, and glucose moves by osmosis.

• Sodium and potassium ions move by facilitated diffusion, and glucose moves by active transport.