Exam 6: Cell Membranes

In cells lining the stomach, the movement of chloride ions into the cells is coupled to the transport of bicarbonate ions out of the cells.This type of transport system most likely uses

Which statement about osmosis is false?

The compounds in a biological membrane that form a barrier to the movement of hydrophilic materials across the membrane are

Refer to the two figures below. The figures show the interaction of the same human muscle cell with oxygen and carbon dioxide.Which statement is correct and supported by these figures?

Refer to the figure below. This diagram can be used to describe two cellular processes that involve membrane proteins.As shown in box A, the process of cell recognition refers to the specific interactions between carbohydrate groups and amino acid groups that allow one cell to identify another cell.As shown in box B, the process of cell _______ results from the strong linkage of two membrane-embedded molecules from two different cells.

The function of the clathrin molecules that coat vesicles in receptor-mediated endocytosis is to

The speed and direction of ions as they move through channels in the cell membrane are determined by the

Temperature has an effect on the fluidity of plasma membranes.Some organisms are able to maintain their membranes' fluidity when it is extremely cold by

In a biological membrane, the phospholipids are arranged in a _______, with the _______.

The process of osmosis allows water molecules to pass through specialized channels in membranes.Which statement about osmosis is true?

Refer to the figure below. Areas A and B are separated by a membrane that is permeable to a substance X.Which set of conditions will result in the greatest rate of diffusion of X into area A?

Which experimental observation would provide evidence that a bacterial membrane protein transfers the sugar lactose into the cell via secondary active transport?

When plant cells are placed in a hypotonic solution, water enters the cells and exerts pressure against the cell wall.This force is called _______.

Refer to the figure below. The molecule outlined by a black box represents a phospholipid, which has a phosphate head and two fatty acid tails.The head is _______ because it readily interacts with the aqueous environment.

Many animal cells have a sodium-potassium pump that moves Na⁺ ions out of the cell and K⁺ ions in.This is an example of a(n)

If the hydrophilic side chains of a transmembrane protein were removed, the protein would most likely

Male and female reproductive cells in animals can recognize each other via specific glycoproteins present on their cell surfaces.Each cell produces a different glycoprotein that recognizes the other.This is an example of _______ binding.

Refer to the table below. The table shows data collected from analyses of the phospholipid compositions of cell membranes isolated from four different animal species.Based on these data, species _______ is the one most likely to live in the Arctic.

Refer to the figures below. The correct sequence of figures for showing the process of endocytosis is _______.

Refer to the table below summarizing information about two membrane proteins. Diffusion coefficients indicate the rates at which proteins diffuse laterally through the cell membrane.What property of cell membranes is illustrated by a comparison of the information shown about these two proteins, and how does this property fit in with the current model used to describe the cell membrane?