Exam 5: Cells: the Working Units of Life

A vesicle carries a protein to the cell membrane, where it is inserted into the phospholipid bilayer.The vesicle budded off from which subcellular structure before making the trip through the cytoplasm to the cell membrane?

Which statement about lysosomes is true?

Ribosomes are found in bacterial cells, in the cytosol of eukaryotic cells, and in the mitochondria and plastids of eukaryotic cells.It has therefore been of interest to researchers to do comparative studies of ribosomes isolated from these locations as a way to test endosymbiotic theory.Which type of comparative information would be most likely to provide evidence that could either refute or support endosymbiotic theory?

The DNA of mitochondria

Scientists have observed that in prokaryotes, translation of messenger RNAs begins before transcription has completed.In contrast, translation is completely separate from transcription in eukaryotes because DNA is isolated in the nucleus away from ribosomes, which carry out protein synthesis in the cytoplasm.What advantage does this compartmentalization provide eukaryotes?

Refer to the diagram of an animal cell below. Which statement about the diagram is correct?

An unidentified membrane-bound body containing no membrane-bound organelles is placed in cell culture, but it does not grow or divide there.However, when it is placed inside a cell that has had its own genetic information removed, both this body and the cell begin to divide.This unidentified body is most likely a

The major factor limiting cell size is the

Scientists have been able to culture human cells so that the cells are able to live and reproduce indefinitely.However, it is not possible for any subset of components of a cell to function in this way; only an entire, undisrupted cell can live and reproduce.This observation supports which tenet of the cell theory?

Refer to the figure below. It is said that this structure has the ability to "feed the world" because it

How does the surface area-to-volume ratio of a sphere 1 mm in diameter compare with the surface area-to-volume ratio of a sphere 3 mm in diameter?

Five statements are given that describe cells.Which statement could best be used to justify the claim that studying cell biology can be considered the same as studying life?

Prokaryotic cells

Which figure correctly depicts the size ranges of both prokaryotic and eukaryotic cells? Note that the scales are logarithmic and not linear.

Researchers observe that while the actin microfilaments in an amoeba seem to be intact, the organism appears incapable of forming pseudopods for movement.They conclude that its immobility may be caused by the absence of the protein

Refer to the table below summarizing the characteristics of three different single-celled organisms isolated from a frozen lake in Antarctica. Classify each organism as either a prokaryote or eukaryote, and explain your reasoning.

To visualize subcellular structures such as chloroplasts, which type of microscopy should be used?

The cytosol and _______ are two components of the cytoplasm in a prokaryotic cell.

Refer to the figure below showing tubular sacs that surround an organelle, synthesize lipids and steroids, and modify toxic molecules for removal. These sacs make up the

One difference between plant cells and animal cells is that