Question 1

How does the cell membrane help maintain homeostasis for the cell?

Accepted Answer

By regulating the transport in and out of the cell

Answer

By providing a circular structure for all cells

Answer

By making proteins to provide the cell with energy

Answer

By storing food as future energy for the cell

Question 2

A student illustrated a model of particles being transported out of the cell.

What best describes the transport process occurring in the model?

Accepted Answer

Energy is used to move sodium ions from low concentration to high concentration.

Answer

Sodium ions are moving from high concentration to low concentration without using energy.

Answer

Sodium ions are moving from low concentration to high concentration without using energy.

Answer

Energy is used to move sodium ions from high concentration to low concentration.

Question 3

A scientist is investigating cell transport. She observes molecules being transported into a cell through proteins present in the cell membrane. These proteins do not use energy to transport the molecules.

Accepted Answer

Facilitated diffusion because the proteins were not using energy

Answer

Osmosis because the molecules were moving against the concentration gradient

Answer

Active transport because membrane proteins were used

Answer

Diffusion because the molecules were entering the cell

Question 4

Which of the following describes a form of active transport?

Accepted Answer

Large molecules are brought into the cell by wrapping the cell membrane around the molecules to form a vacuole.

Answer

Membrane proteins provide a pathway for larger particles to move across the cell membrane and bring the cell and environment closer to equilibrium.

Answer

Water moves across the cell membrane from the side with high osmotic pressure towards the side with low osmotic pressure.

Question 5

Which of the following describes a form of passive transport?

Accepted Answer

Membrane proteins provide a pathway for larger particles to move across the cell membrane and bring the cell and environment closer to equilibrium.

Answer

Large molecules are brought into the cell by wrapping the cell membrane around the molecules to form a vacuole.

Answer

Membrane proteins act as an enzyme to break down ATP and use the energy to move particles against the concentration gradient.

Answer

Membrane proteins use the energy of the cell’s resting potential to move particles against the concentration gradient.

Question 6

Which of the following describes osmosis?

Accepted Answer

Water moves across the cell membrane from the side with high osmotic pressure towards the side with low osmotic pressure.

Answer

Oxygen transfers into red blood cells through small gaps in the cell membrane from the oxygen-rich environment surrounding the cells.

Answer

Large molecules are brought into the cell by wrapping the cell membrane around the molecules to form a vacuole.

Answer

Membrane proteins provide a pathway for larger particles to move across the cell membrane and bring the cell and environment closer to equilibrium.

Question 7

Students are discussing what they know about cellular transport. Their explanations are displayed in the table.

Which student(s) gave an accurate statement regarding cellular transport?

Accepted Answer

Students 1, 2, and 4

Answer

Students 1 and 2

Answer

Students 2, 3, and 4

Answer

Student 1 only

Question 8

Diffusion and osmosis are both vital to cell function. Diffusion and osmosis are similar in that they are both types of –

Accepted Answer

passive transport processes

Answer

protein synthesis processes

Answer

cellular metabolism processes

Answer

cellular replication processes

Question 9

This diagram shows cellular activity across a cell membrane.

Which two processes does this diagram most directly model?

Accepted Answer

Homeostasis and transport of molecules

Answer

Energy conversions and synthesis of new molecules

Answer

Transport of molecules and energy conversions

Answer

Synthesis of new molecules and homeostasis

Question 10

Some students used vinegar to dissolve away the shells of three eggs and used these eggs as models of human red blood cells. The students observed the changes in the eggs when they were placed in different solutions.

Which statement best describes the role of the cell membrane in this model?

Accepted Answer

The cell membrane allows water to enter and leave the cell.

Answer

The cell membrane removes solutes from the environment. ▲

Answer

The cell membrane is an impermeable barrier that prevents water from entering the cell.

Answer

The cell membrane allows solutes to enter the cell, which causes the cell to shrink.

Question 11

The picture shows a contractile vacuole of a unicellular freshwater organism. The contractile vacuole regulates the flow of water into and out of the cell in an aquatic environment.

What conditions cause the contractile vacuole to fill with water?

Accepted Answer

The concentration of water is greater outside the cell than inside the cell.

Answer

The concentration of water inside the cell is the same as the concentration outside the cell.

Answer

The temperature of water in the vacuole is higher than the temperature of its environment.

Answer

The temperature of water in the vacuole is lower than the temperature of its environment. ▲

Question 12

The diagram illustrates the activity of vesicles during a cellular process.

Which statement best explains the function of the vesicles?

Accepted Answer

Transporting packaged molecules (vehicles) from the Golgi apparatus to be released out of the cell

Answer

Exchanging genetic information between the Golgi apparatuses of separate cells

Answer

Delivering packaged materials to the Golgi apparatus for protein synthesis

Answer

Extracting portions of the Golgi apparatus to be regenerated for growth within the cell

Question 13

A few drops of Lugol's iodine solution placed in a beaker of water will turn the water red. A white starch solution was poured into a length of dialysis tubing and the ends were tied. The tubing was then dropped into the beaker of iodine solution. After 10 minutes, the white starch solution turned black, and the iodine water remained red. In the model, what is the tubing most likely representing?

Accepted Answer

cell membrane

Answer

chloroplast

Answer

mitochondria

Answer

<P>nucleus</P>

Question 14

A type of cellular transport is shown. Which description best identifies this type of cellular transport?

Accepted Answer

Active transport, because energy is being used to move molecules against the concentration gradient

Answer

Facilitated diffusion, because energy is being used to move molecules with the concentration gradient

Answer

Osmosis, because energy is not being used to move molecules with the concentration gradient

Answer

Endocytosis, because energy is not being used to move molecules against the concentration gradient

▲

Question 15

The cellular process known as the sodium-potassium pump was discovered in the 1950s by Jens Christian Skou, a Danish scientist. This process is a form of active transport that moves three sodium ions to the outside of a cell for every two potassium ions that it moves into the cell. Which of these best explains why energy is needed for active transport?

Accepted Answer

Ions are moved against the concentration gradient

Answer

Ions are attached to large proteins

Answer

Ions are trapped inside the plasma membrane

Answer

Ions are negatively charged

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