A set of erythrocytes is placed in a beaker of 0.9% NaCl. Nothing appears to hap

Question

A set of erythrocytes is placed in a beaker of 0.9% NaCl. Nothing appears to happen to the cells. Why?

0.9% NaCl is hypertonic to the cells.

Sodium blocks the movement of water.

0.9% NaCl is hypotonic to the cells.

0.9% NaCl is iostonic to the cells.

water has not moved at all.

Question 2

Select one answer.

Which substance would be most likely to pass through a lipid bilayer/plasma membrane without embedded proteins?

water

a steroid hormone

a large fatty acid

a large peptide hormone

a sodium ion

Question 3

Select all that apply.

Which of the following can cross the cell’s plasma membrane without the assistance of protein transporters? Select all that apply.

large polar molecules

positively charged ions

small hydrophobic molecules

gasses

Question 4

Select one answer.

Biological Membranes are:

symmetrical.

impermeable.

static.

dynamic.

Question 5

Select one answer.

How does the selective permeability of the membrane help the cell.

This allows the cell to maintain the proper shape.

This allows the cell to regulate what enters and exits

This allows the cell to maintain a constant temperature.

All of these

Question 6

Select one answer.

What is the role of carbohydrates in the plasma membrane?

cellular identification

adhesion

transport materials across the membrane

help maintain fluidity

Question 7

Select one answer.

Which component of the plasma membrane has the widest variety of functions?

sterols

carbohydrates

phospholipids

proteins

Question 8

Select one answer.

All of the following have an effect on the fluidity of a membrane except:

interactions among fatty acids in the core of the bilayer

the cholesterol content

the ratio of saturated to unsaturated fatty acids

the presence of integral proteins in the membrane

Explanation / Answer

1- A set of erythrocytes is placed in a beaker of 0.9% NaCl. Nothing appears to happen to the cells. Why?

Answer - 0.9% NaCl is iostonic to the cells. (isotonic means both have same solute potential so there is not net movement of Nacl)

2. Which substance would be most likely to pass through a lipid bilayer/plasma membrane without embedded proteins

Answer - a steroid hormone ( water move throught osmosis and other molecule are too large )

3. Which of the following can cross the cell’s plasma membrane without the assistance of protein transporters

Answer - small hydrophobic molecules and gasses can cross the cell's plasma membrane

4. Biological Membranes are:

Answer - Dynamic cause membrane consist of phospholipid bilayer which have regular fluid motion.

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