Exam 5: Cells: the Working Units of Life

Tough ropelike filaments that stabilize cell structure and resist tension are called _______ filaments.

In some prokaryotic organisms, the plasma membrane folds to form an internal membrane system that is able to

Some organelles in eukaryotic cells are thought to have

A moss cell is placed in culture with an unknown chemical substance.It is found that the cell appears able to "divide," because the cell is observed to grow and replicate its internal organelles and nuclei, but it does not form primary cell walls.It appears that the substance has affected the synthesis of the polysaccharides that compose the cell wall.Which organelle is possibly targeted by the unknown chemical?

Which structures are components of chloroplasts?

The DNA of prokaryotic cells is found in the

Which is not a characteristic of a prokaryotic cell?

Ribosomes are not visible under a light microscope, but they can be seen with an electron microscope because

Five true statements about mitochondria and/or chloroplasts are given.Which statement could be considered evidence that supports endosymbiotic theory?

Refer to the figure below. If the nucleus evolved via a mechanism such as that shown in the figure, which statement would be true of the nuclear envelope?

A particle of food encounters a series of cellular structures during digestion by an animal cell.In what order does this encounter occur, starting from the exterior of the cell?

Refer to the figure below. Ribosomes can be found in which section of the organelle shown in the figure?

Scientists have researched methods to transplant stem cells to human heart tissue to repair severe damage by cardiovascular disease.Studies in model systems have shown that if the transplanted stem cells are not washed with a buffered saline solution before transplantation, they adhere, adapt, and survive better.Which statement best explains this observation?

The overall shape of an animal cell is determined by its

A small dye molecule injected into a plant cell can pass into adjacent plant cells because of the presence of

Refer to the figure below. Explain the current hypothesis about the evolutionary origins of the structure shown in the photograph in the figure.

Although plant and animal cells are both classified as eukaryotic, they do have some differences.Which pair correctly names an animal and a plant cell structure that serve some of the same functions?

Which type of microscopy has the highest resolution?

The cytoskeleton is composed of three major components, each with distinct functions.Which represents the correct order of these components, from smallest to largest size?

Louis Pasteur's experiment in which he boiled broth and allowed it to cool under conditions that prevented exposure of the broth to dust provided evidence in support of the cell theory tenet that all cells come from preexisting _______.