Unit 5 Homework

Question 1

The components of a cell membrane that have a specific role in cell-to-cell recognition are the:

Answer 1

Glycoproteins and glycolipids

Question 2

Our current model of cell membrane structure is:

Answer 2

a fluid-mosaic model

Question 3

Is O2…

1)
freely permeable in the membrane

2)
somewhat permeable in the membrane

3)
impermeable in the membrane

Answer 3

freely permeable

Question 4

Is H2O…

1)
freely permeable in the membrane

2)
somewhat permeable in the membrane

3)
impermeable in the membrane

Answer 4

somewhat permeable

Question 5

Is CO2…

1)
freely permeable in the membrane

2)
somewhat permeable in the membrane

3)
impermeable in the membrane

Answer 5

freely permeable

Question 6

Is OH- …

1)
freely permeable in the membrane

2)
somewhat permeable in the membrane

3)
impermeable in the membrane

Answer 6

impermeable

Question 7

Is H+ …

1)
freely permeable in the membrane

2)
somewhat permeable in the membrane

3)
impermeable in the membrane

Answer 7

impermeable

Question 8

Is C6 H12 O6…

1)
freely permeable in the membrane

2)
somewhat permeable in the membrane

3)
impermeable in the membrane

Answer 8

impermeable

Question 9

The special case of diffusion in which water moves down its concentration gradient across a semipermeable membrane is known as:

Answer 9

Osmosis

Question 10

Water is able to move rapidly through cell membranes due to the presence of special channel proteins known as:

Answer 10

Aquaporins