Exam 7: Cell Membranes, Transport, and Communication

Soon after a certain molecule enters a cell, the cell begins producing a new type of protein. The molecule was probably a

After a steroid hormone enters a target cell it

During ____________________ endocytosis, specific substances interact with proteins located on the plasma membrane of the cell.

The figure below illustrates a plasma membrane. Which solute in the figure is crossing the membrane using simple diffusion?

Which of the following signaling molecules would not be found in animals?

Objects suspended in the extracellular fluid can cross the plasma membrane and enter a cell by

When the solute concentration outside of a cell is equal to the solute concentration inside of the cell, the cell is in a(n)____________________ solution.

Elevated HDL (high-density lipoprotein)levels seem to provide positive cardiovascular health effects even for individuals with abnormally high blood cholesterol. What best describes the beneficial action of HDL?

What best explains the double-headed arrows associated with water, carbon dioxide, and molecular oxygen shown in the illustration below?

Even though the concentration of water in a cell remains constant in an isotonic solution, the random movement of water molecules during ____________________ requires that water be constantly moving in both directions across the plasma membrane.

Which of the following statements about hormones is false?

Why do some hormones, like thyroxin, affect most or all body cells while others only affect a single organ or type of cell?

Hydrophilic signaling molecules

A white blood cell at the site of a puncture wound engulfs a large cluster of bacteria forming a large internal vesicle. This is an example of

The figure below shows the movement of solutes across a plasma membrane in the direction indicated by the arrows. This movement across the membrane

Hikers can detect a dead skunk along a trail long before they actually see it. What process allows the scent of the skunk to be so widely dispersed?

To coordinate the contraction of the numerous muscle cells that form the heart, signals must travel rapidly between muscle cells. In order to allow this rapid communication, muscle cells in the heart are connected by

After eating a meal high in carbohydrates, the pancreas begins releasing insulin by the process of ____________________.

Cell-to-cell communication in humans involves the brain.

Passive carrier molecules often require active carrier proteins to provide amino acids for transport.