EOC Review LS1.7 - Pre-Assessment

Which statement about active transport is most accurate

• Active transport utilizes energy from ATP molecules

• Active transport is essential to move water into and out of a cell

• Active transport is the only way to move ions into and out of a cell

• Active transport is required to move ions into and out of a cell

Which statement correctly describes the way(s) that glucose and water molecules are transported into a cell?

• Glucose and water molecules move into a cell only with the help of a transport protein.

• Glucose and water molecules move into a cell by passing directly through the cell membrane.

  Glucose and water molecules move into a cell by passing directly through the cell membrane.

• Glucose molecules move into a cell with the help of a transport protein, while water molecules pass directly through the cell membrane.

• Glucose molecules move into a cell by passing directly through the cell membrane, while water molecules move with the help of a transport protein.

Red blood cells normally circulate in a fluid known as plasma. Plasma is isotonic to red blood cells and typically contains about 95% water, along with salts and other ions. The table defines the composition of four solutions available for administration to patients in an IV solution.

• Solution 1

• Solution 2

• Solution 3

• Solution 4

What will be the most likely effect of placing a freshwater protozoan in a highly concentrated saltwater solution?

• The protozoan will burst.

• The protozoan will swell.

• The protozoan will shrink.

• The protozoan will be unaffected.

The marine fish known as teleosts live in seawater with a salt concentration higher than that of the water in their bodies. As a result, they continuously lose water to the environment and need to replace it by drinking seawater.

How does the fish maintain homeostasis during this process?

• by retaining water and eliminating salt by osmosis

• by retaining salt and eliminating water by osmosis

• by retaining salt and eliminating water by active transport

• by retaining water and eliminating salt by active transport

What condition must be true if a substance enters a cell by active transport?

• ATP is used by the cell for the transport process.

• The substance is a part of the cell structure.

• Water moves out of the cell to let the substance enter.

• The substance is highly concentrated outside the cell.

Examine the diagram of the cell.

What must be true about the relative solute concentrations for this cell?

• Solute concentrations are greater inside the cell than outside the cell.

• Solute concentrations are greater outside the cell than inside the cell.

• Solute concentrations are equal on both sides of the cell wall.

• There are no solutes inside the cell.

Red blood cells normally circulate in a fluid known as plasma. Plasma is isotonic to red blood cells and typically contains about 95% water, along with salts and other ions. The table defines the composition of four solutions available for administration to patients in an IV solution.

Hyponatremia is a condition that endurance athletes face as they sweat, losing both water and electrolytes, which are salts and other ions needed for proper cellular function. Without the proper concentration of electrolytes, the central nervous system does not conduct electrical impulses properly. When a person becomes dehydrated, brain function is impaired.

Which solution would a doctor use as an IV for a suspected hyponatremia victim both to rehydrate and replenish the electrolytes properly, and why?

• Solution 1; it would add water back to the victim's dehydrated cells.

• Solution 2; it would add water and electrolytes back to the cells of the victim.

• Solution 3; it would remove electrolytes from the victim's dehydrated cells.

• Solution 4; it would remove excess water from the cells of the of victim.

A model of two balloons filled with sugar solutions of different concentrations is shown to students prior to a science experiment. The balloons are connected to each other using glass tubing that contains a semi-permeable membrane. The students are asked to draw a model showing the appearance of the balloons if only osmosis occurs.

Which model is drawn correctly?

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The diagram shows the transport of different molecules across the cell membrane.

Which process can be categorized as active transport?

• Process 1. It does not require energy.

• Process 2. It moves molecules from high to low concentrations.

• Process 3. It involves the use of carrier proteins.

• Process 4. It involves the use of energy.