Exam 5: The Working Cell

The act of a white blood cell engulfing a bacterium is ______.

Facilitated diffusion across a biological membrane requires ______ and moves a substance ______ its concentration gradient.

Read the following scenario to answer the following question(s). Cellular respiration converts the energy of fuel molecules to a form of energy that a cell can use to perform work. In an average day, most adult humans need to consume about 2,000 Calories to maintain their health. However, the exact amount of dietary Calories a person needs depends upon many factors, including the person's age, physical activity, size, and health. Foods that we consume vary greatly in their nutritional content and quality. A large hard-boiled egg, for example, has about 75 dietary Calories and contains about 70% of our recommended daily intake of cholesterol. -The amount of dietary Calories in one hard-boiled egg could raise the temperature of ______.

A cell that neither gains nor loses water when it is immersed in a solution is ______.

Certain cells that line the stomach synthesize a digestive enzyme and secrete it into the stomach.This enzyme is a protein.Which of the following processes could be responsible for its secretion?

In a hypotonic solution,a plant cell will ______.

What compound directly provides energy for cellular work?

An object at rest has no ______ energy,but it may have ______ energy resulting from its location or structure.

Which of the following is most like a signal transduction pathway in a cell?

Read the following scenario to answer the following question(s). Cellular respiration converts the energy of fuel molecules to a form of energy that a cell can use to perform work. In an average day, most adult humans need to consume about 2,000 Calories to maintain their health. However, the exact amount of dietary Calories a person needs depends upon many factors, including the person's age, physical activity, size, and health. Foods that we consume vary greatly in their nutritional content and quality. A large hard-boiled egg, for example, has about 75 dietary Calories and contains about 70% of our recommended daily intake of cholesterol. -If a person eats one hard-boiled egg and digests the egg fully,cellular respiration will convert most of this energy into ______.

Which of the following processes could result in the net movement of a substance into a cell,if the substance is more concentrated in the cell than in the surroundings?

Glucose molecules provide energy to power the swimming motion of sperm.In this example,the sperm are changing ______.

Which one of the following is true?

Active transport ______.

Examine the following figure.Imagine that cell signaling using a signal transduction pathway is like a person answering the door after hearing the doorbell ring.Which structure in this figure is like the button for the doorbell?

Humans convert approximately ______ of the energy stored in food to useful work.

Substances that plug up an enzyme's active site are ______.

Which component of the following reaction is the substrate? sucrose + sucrase + water → sucrase + glucose + fructose

Relaying a message from a receptor protein to a molecule that performs a specific function within a cell is called ______.

Some protozoans have special organelles called contractile vacuoles that continually eliminate excess water from the cell.The presence of these organelles tells you that the environment ______.