Biology Midterm Exam 22/23

Which statement is a hypothesis?

• The presence of an enzyme increased the reaction rate.
• The reaction rate increased 100% once the enzyme was introduced.
• Introducing an enzyme into a reaction did not increase the rate of the reaction.
• When an enzyme is introduced into a reaction the reaction rate will increase by 100%.

A scientist studies birds on a set of islands. Based on their varied beak types but similar body structure, the scientist proposes that the birds had a common ancestral population, which then adapted to the local food sources of the different islands. Which BEST describes the scientist’s proposal?

• a hypothesis
• a principle
• a theory
• a fact

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.

Which sequence of steps is needed for the scientist’s hypothesis about the absence of amphipods to eventually become a theory?

• 3, 2, 4, 1, 5
• 4, 3, 5, 1, 2
• 5, 1, 4, 2, 3
• 5, 4, 3, 2, 1

Statement 1: All living things are composed of cells. Statement 2: If soil contains high levels of salt, the plants will die. Statement 3: The temperature reading on the thermometer is 21°C. Statement 4: It must have rained this morning because the soil is wet. A teacher lists four statements for students to interpret. Which table of information correctly distinguishes between the statements?

• 
• 
• 
• 

Which characteristic is shared by ALL prokaryotic and eukaryotic organisms?

• the ability to reproduce asexually
• the ability to make their own food
• the need for a source of energy
• the need for oxygen for respiration

Which characteristic is shared by both prokaryotes and eukaryotes?

• need oxygen gas to breathe
• have organ systems
• make their own food
• contain genetic material

What characteristic is shared by ALL organisms?

• Ability to reproduce
• Use of specialized cells
• Ability to convert light into energy
• Use of nuclei to direct cell activities

Life functions are performed at many levels of biological organization. Which level of biological organization is the simplest level at which a structure can support life functions?

• cell
• tissue
• organelle
• organ system

Which statement BEST explains why these cells have structural differences?

• The cells have different functions.
• The cells evolved in different organisms
• One of the cells develops into the other type of cell.
• One of the cells is more primitive than the other cell.