AP Biology Exam Review Mix

Which is NOT a way that components of the cell membrane maintain homeostasis?

• Embedded cholesterols prevent excessive fluidity or excessive rigidity during extreme temperature conditions.
• Glycoproteins and glycolipids act as receptors for extracellular signals that can activate various signal transduction pathways.
• Cytoskeletal filaments provide structural integrity and pathways for intracellular molecular movement.
• The amphipathic nature of phospholipids, coupled with integral transport proteins, act as a barrier to enhance selective permeability.

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Which of the following MOST accurately explains the proximity of the Golgi apparatus to the RER and the cell membrane?

• The Golgi apparatus needs to be close to teh RER so that it can modify the lipids that are produced by the RER before they will be exported from the cell. The Golgi will further modify the lipids and then create vesicles that will fuse with the cell membrane to efficiently excrete the products. 
• The Golgi apparatus is close to the RER so that it can properly translate the proteins as directed by the DNA instructions received by the RER from the nucleus. The Golgi apparatus is close to the RER so translation can take place quickly. Once the proteins are produced, they can be sent out of the cell by fusing with the cell membrane.
• The Golgi apparatus is close to the cell membrane so it can fuse with the vesicles or imported materials. This allows the Golgi apparatus to quickly break down the imported materials so they can be sent to the RER for further processing. The RER will use the imported materials to make proteins for the cell.
• The Golgi apparatus needs to be close to the RER as it receives proteins that have been produced and modified by the RER that will be exported from the cell. Once the contents of the vesicles are received from the RER and move through the Golgi apparatus, they are then excreted from the Golgi apparatus via vesicles that will fuse with the cell membrane for export out of the cell. The closeness of these organelles is directly related to the needs of the cell to export material efficiently.

Which of the following are products of the light reaction?

• ATP and NADH
• glucose and oxygen
• oxygen and NADPH
• carbon dioxide and water

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J-Shaped curves

• show a decline after an increase
• display populations that have reached carrying capacity
• represent exponential growth
• does not depend on the numbe rof resources

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A herd of zebras would be considered a

• community
• species
• ecosystem
• population

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Two organisms of different species exist in a relationship in which each individual benefits from the activity of the other:

• commensalism
• parasitism
• herbivory
• mutualism

All of the following are density-dependent factors that limit animal populations EXCEPT.

• weather
• predation
• food competition
• birthrate

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Which organism contains the most energy?

• Rabbit
• Grains
• Birds
• Mice

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Which of the following is a primary consumer in this food web?

• Foxes
• Carrots
• Mice
• Owls

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What type of organism recycles energy back into an ecosystem?

• Herbivore
• Carnivore
• Autotroph
• Decomposer

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