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Prions are proteins that act as an infectious agent. They cause a variety of diseases, including “Mad Cow” disease. Prions cannot produce more prions on their own, but cause the host organism to replicate more prions. Most scientists do not consider prions to be alive. A valid reason for accepting that prions are nonliving things is that*
The diagram below represents an incomplete sequence of levels of organization.
organelles → tissues → organs → organ systems → organism
This sequence can be completed correctly by inserting*
Which sequence best represents increasing complexity?*
Rabbits have evolved strategies that get them through periods of time when there is little food. The diagram below represents essential life functions that rabbits need to perform.
Which life function in the diagram could be eliminated without affecting an individual rabbit’s ability to survive when food is scarce?*
Bacteria and humans are similar in that they both*
During gas exchange, the cell membrane of a single-celled organism has the same function as which organ system in humans?*
Which sequence represents structures organized from least complex to most complex?*
Scientists who study rock formations in caves describe some of the formations as “living rock” because, under certain conditions, they increase in size. Which statement would best dispute the claim that these rock formations are living?*
Fish absorb oxygen through the gills, earth- worms absorb oxygen through the skin, amebas take in oxygen through the cell membranes, and cows inhale oxygen through the nasal passages into their lungs. This statement demonstrates that living things*
Which diagram best illustrates the relationship between the number of cells, tissues, and organs in a complex multicellular organism?*
Base your answers to questions 11 on the diagrams below and on your knowledge of biology. The diagrams represent a single-celled organism and a multicellular organism.
Which statement correctly identifies the levels of organization for the structures indicated?*
The diagram below represents the organization of structures within an organism.
Which term best indicates the structures represented by the circle labeled X?*
Some levels of organization in a multicellular organism are shown in the sequence below.
A → cells → tissues → B → organ systems → organism
Which terms represented by letters A and B would complete the sequence?*
The diagram below represents two organisms.
Which statement concerning organism A and organism B is correct?*
The sequence below represents different organizational levels within the human body, from the simplest to more complex. Complete the sequence by correctly filling in the missing levels. 
organelles → ________________ → tissues → ________________ → organ systems → organism*