QUESTION 1 Which of the following lists all the types of molecules that could be

Question

QUESTION 1

Which of the following lists all the types of molecules that could be found in the plasma membrane of animal cells?

A. Phospholipids, proteins, glycolipids, cholesterol, sphingolipids

B. Phospholipids, proteins, glycolipids, cholesterol, triacylglycerides

C. Phospholipids, proteins, glycoproteins, glycolipids, cholesterol, sphingolipids, triacylglycerides,

D. Phospholipids, proteins and cholesterol

E. Phospholipids, proteins, glycoproteins, glycolipids, cholesterol, sphingolipids

QUESTION 2

Where would glycolipids (phospholipids with an oligosaccharide attached) be found in cells?

A. In the outer leaflet with the oligosaccharide sticking outside the cell

B. In the cytosol

C. In the nuclear membrane

D. In the inner leaflet with the oligosaccharide sticking inside the cell

E. Inside organelles

QUESTION 3

The nematode worm Caenorhabditis elegans (C. elegans) is a good model system because it allowed researchers to

A. observe the process of fertilization better than had been possible in the past

B. follow the process of how cells growing individually can aggregate to form a simple multicellular organism.

C. follow the developmental lineage of all the cells found in an adult from a single fertilized egg cell microscopically

D. identify the genes involved in differentiation of every cell type found in mammals

QUESTION 4

If concentration of sodium and potassium ions were at the following concentrations inside and outside a cell, how could the two molecules enter the cell?

Molecules

Concentration inside the Cell

Concentration outside the Cell

Sodium ion (Na+)

10 mM

150 mM

Potassium ion (K+)

140 mM

5 mM

A. Both would require active transport in order to enter the cell

B. Both would diffuse through the membrane into the cell without going through protein channels

C. Potassium ions could enter by facilitated diffusion while the sodium ions would need active transport to enter the cell.

D. Both would enter by facilitated diffusion through protein channels

E. Sodium ions could enter by facilitated diffusion while the potassium ions would need active transport to enter the cell

QUESTION 5

Transmission electron microscopy is used to

A. observe subcellular organelles and viruses.

B. view cells in three dimensions.

C. study the shapes of whole cells.

D. view fluorescently labeled proteins in cells.

QUESTION 6

Active transport differs from facilitated diffusion in that

A. ions are not transported via active transport.

B. active transport requires a protein component, whereas facilitated diffusion occurs by simple diffusion through the plasma membrane.

C. active transport involves a conformational change in the transport molecule.

D. active transport involves the transport of molecules up or against their concentration gradient

QUESTION 7

Which of the following is the best description of the movement observed by integral membrane proteins?

A. Integral membrane proteins do not move in any manner in the membrane

B. All integral membrane proteins will diffuse lateral through the membrane

C. All integral membrane proteins can flip their orientation in the membrane (portion on outside verse inside).

D. Some integral membrane proteins can diffuse laterally through the membrane while others are held in place and do not move laterally and the proteins do not flip their orientation in the membrane.

E. B and C

QUESTION 8

A feature common to almost all transmembrane proteins is

A. a structure consisting almost exclusively of -sheets.

B. an amino acid sequence rich in acidic residues

C. an -helical region of about 20 to 25 hydrophobic amino acids.

D. a phosphorylated exterior domain.

QUESTION 9

Green fluorescent protein is commonly used to

A. label antibodies.

B. label DNA sequences

C. visualize the localization of proteins in living cells.

D. photobleach other fluorescent proteins.

QUESTION 10

Which of the following is true about the phospholipids one would observe in the membranes of an eukaryotic organism?

A. The type of phospholipids found in the membranes of a cell would vary by the cell type but would be the same within all the organelles of the cell.

B. All the membranes in the organism including the membranes of organelles of cells would contain the same ratio of different phospholipids.

C. The type of phospholipids found in the membrane of a cell would vary in the different cell types, in the membranes of the different organelles and in the two halves of each membrane in the different parts of the cell.

D. The type of phospholipids found in the membranes of a cell would vary in the different cell types and in the organelles of the different cell types but would be the same in both halves of membrane in each part of a cell.

E. All the membranes in the organism including the membranes of organelles would contain only one type of phospholipid.

Molecules

Concentration inside the Cell

Concentration outside the Cell

Sodium ion (Na+)

10 mM

150 mM

Potassium ion (K+)

140 mM

5 mM

Explanation / Answer

ANSWER 1 : (C) option is correct.

Phospholipids, proteins, glycoproteins, glycolipids, cholesterol, sphingolipids and triacylglycerides all are the molecules that could be found in the plasma membrane of the animal cells.

ANSWER 2 : (A) option is correct.

Glycolipids are found exclusively in the outer leaflet with the oligosaccharide sticking outside the cell.

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