Wednesday 01/24/24

A red blood cell is placed into an aqueous solution. The red blood cell has a lower concentration of protein and sugar than the aqueous solution, as shown in the diagram. In the diagram, the volume of the cell is equal to the volume outside the cell.

What is most likely to occur?

• Water from the solution will diffuse into the red blood cell.

• Water from the red blood cell will diffuse into the solution.

• Protein and sugar from the solution will diffuse into the red blood cell.

• Protein and sugar from the red blood cell will diffuse into the solution.

Tags

NGSS.HS-LS1-3

The diagram shows an incomplete cross-section of a cell membrane. Three different particles are shown moving across the membrane into or out of the cell.

Determine the appropriate transport mechanism of each particle and move the name of the correct membrane segment into each blank box to complete the cross-section diagram.  The membrane segments are shown below the cell membrane in a random order.

• Move only one membrane segment into each box.

a

b

c

Phospholipids

ATP Pump

Channel

For normal nerve transmission in mammals, nerve cells maintain specific concentrations of potassium (K⁺) and sodium (Na⁺) ions. Concentrations of Na⁺ ions are normally higher outside the cell and lower inside the cell, while K⁺ ions are normally lower outside the cell and higher inside the cell. However, cell membranes are impermeable to Na⁺ and K⁺ ions. The diagram shows the relative concentrations of ions in solution inside and outside the cell.

Which process describes how a nerve cell maintains homeostasis in regards to the Na⁺ and K⁺ ion concentrations?

• by converting the sodium ions present inside the cell into potassium ions

• by blocking both types of ions from moving into or out of the cell membrane

• by transporting both types of ions through protein pumps within the cell membrane

• by producing more potassium ions inside the cell and eliminating sodium ions as wastes

Tags

NGSS.HS-LS1-3

The diagram models the time-lapse movement of particles across a cell membrane. The particles have characteristics that allow them to pass freely across the membrane.

Select all of the statements that describe the particles or their movement based on the time-lapse diagram.

• The particles crossing the membrane do not have a charge.

• The movement across the membrane does not require added energy.

• The particles crossing the membrane could be water (H₂O) or oxygen (O₂)

• The particles crossing the membrane have at least a partial charge.

• The movement accross the membrane requires energy from ATP

From what molecule do cells directly acquire usable energy?

• ATP

• Glucose

• Lipids

• Proteins

Tags

NGSS.HS-LS1-7

Did you turn in your Bioman Enzymatic Paper!?

• Wait...that's due TODAY!? Guess I'll be turning it in late...

• Yup!