Exam 6: Cell Membranes

Refer to the figure below showing results from an analysis of the fluidity of neutrophil membranes as a function of their cholesterol content.Neutrophils are a type of white blood cell in humans. Which statement is consistent with these data?

_______ proteins are embedded in biological membranes while _______ proteins are associated with surface regions of biological membranes.

Heart muscle cells beat in unison because of the rapid spread of electrical current through

Diffusion is the net movement of particles toward regions of (higher/lower) _______ concentration.

Refer to the figure below, which is being created to illustrate secondary active transport. What is missing from the figure?

Binding between two identical molecules on two cells in cell adhesion is called _______ binding.

The structure of a biological membrane is best described by the _______ model.

Refer to the table below. Which list contains every substance in the table that can be predicted to pass via simple diffusion across a biological membrane?

If a cell is bathed in an extracellular solution higher in Na⁺ concentration than the cytoplasm, it will use _______ to maintain its normal intracellular concentration of Na⁺.

If a beneficial drug needed a carrier protein for it to enter the target cells in muscles, a good protein to ensure the highest rate of delivery would be

To survive in a hypertonic saltwater environment, a unicellular organism would have to expend energy to pump water (into/out of) _______ its cytoplasm.

Phagocytosis, pinocytosis, and receptor-mediated endocytosis all involve

You are monitoring the diffusion of a molecule across a membrane.Of the options listed below, the fastest rate of diffusion would result from an internal concentration of _______ M and an external concentration of _______ M.

Specialized cells in the heart are able to maintain a rhythmic heartbeat due to the rapid spread of electrical current through

The sodium-potassium pump functions as an antiporter.What does this pump use to drive ion movement?

Both phagocytosis and receptor-mediated endocytosis

Carbohydrates play a role in the biological membrane as recognition sites for other cells and molecules.They covalently bind to a protein in the membrane to form

A biologist wants to compare the fluidity of membranes from different human cells.Which data will provide information that can be used for this analysis?

Which helps ensure the diffusion of glucose into a cell that has a high energy need?

A hibernating animal must make changes at the cellular level to prevent damage in colder temperatures.How might cell membranes of these animals be affected?