Biology Keystone Review 2

Which of the following conclusions can be drawn from this graph?

• The optimum pH of the enzyme is 6.6.
  
• The optimum pH of the enzyme is 5.8
  
• The enzyme’s activity increases as pH increases 5.0 to 9.0
  
• The enzyme’s activity is greater around pH of 8.0 .
  

What type of macromolecule are enzymes?

• Protein
• Carbohydrate
• Lipid
• Nucleic Acid

Enzymes need certain environmental conditions in order to function properly.  What happens when enzymes are heated to a high temperature?

• they die
• they denature
• they change their amino acid sequence
• they work better

The part of the enzyme that the substrate bonds to is called the _____.

• active site
• activation energy
• bond site
• peptide bond

A group of students measured a ten-square-meter section of a pond ecosystem and recorded observations. Which statement is a testable hypothesis?

• The frogs living in the pond represent a population
• Water is an abiotic component in the pond ecosystem
• If the fish are given more food, then they will be happier
• If the frogs are startled, then they will jump into the water

A researcher observing an ecosystem describes the amount of sunlight, precipitation, and type of soil present. Which factors is the researcher most likely describing?

• biotic factors in a forest
• biotic factors in a tundra
• abiotic factors in a prairie
• abiotic factors in an ocean

A species of snapping turtles has a tongue that resembles a worm. The tongue is used to attract small fish. Which best describes the interaction between the fish and the snapping turtle?

• predation
• symbiosis
• parasitism
• competition

Which statement correctly describes how nitrogen in the soil returns to the atmosphere?

• Soil bacteria convert nitrates into nitrogen gas
• Decomposers directly convert ammonium into nitrogen gas
• Plants assimilate nitrites and convert them into nitrogen gas
• Nitrogen-fixing bacteria in plant roots convert nitrates into nitrogen gas

Tags

NGSS.MS-LS2-3

Which sequence correctly describes the flow of energy between organisms in the marine food web?

• from seals to penguins to krill
• from whales to krill to small fish
• from sea birds to seals to penguins
• from small fish to penguins to seals

Tags

NGSS.MS-LS2-3

A farmer observed that an increase in a field’s soil nitrogen content was followed by an increase in producer productivity. What does this observation most likely indicate about the relationship between nitrogen and the producers in the field?

• Nitrogen was a biotic factor
• Nitrogen was a limiting factor
• Nitrogen became a surplus resource
• Nitrogen became a selection pressure

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4