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CSIR- NET LIFE SCIENCES - TEST 3

Total questions: 45

Worksheet time: 2hrs 30mins

Name
Class
Date
1.

Which of the following criteria can be used to distinguish between prokaryotic and eukaryotic cells ?

a)

Whether or not they have a plasma membrane

b)

Whether or not they have a nucleus.

c)

Comparison of the sequence of homologous proteins.

d)

Comparison of the signature sequence of 16S rRNA.

2.

Identify a peripheral protein

a)

structure a

b)

strucure b

c)

structure g

d)

structure h

3.

Plasma membranes are selectively permeable. This means

a)

anything can pass in and out

b)

the membrane regulates the passage of the material in and out of the cell

c)

glucose cannot enter the cell

d)

cholesterol cannot enter

4.

Which is NOT a function of the membrane?

a)

it forms a selective barrier

b)

it has receptors for chemical messages

c)

it is the control center of the cell

d)

it is involved in self recognition

5.

Membrane phospholipids

a)

have hydrophobic heads that face the center of the membrane and are shielded from water

b)

have hydrophilic tails that face outward

c)

remain fluid because they are tightly packed

d)

none of these

6.

The cholesterol associated with membranes

a)

is attached to proteins and extends into the environment surrounding the cell

b)

helps stabilize the membrane at body temperature

c)

is an abnormality resulting from a diet high in cholesterol

d)

both a and c

7.

Which structure is the hydrophilic polar head of the phospholipid molecule?

a)

F

b)

D

c)

C

d)

A1

8.

Which structure is the hydrophobic tail of the phospholipid molecule?

a)

E

b)

B

c)

G

d)

A2

9.
lateral movement of phospholipids occur more often than flip-flop movement
a)
true
b)
false
10.
The function of the plasma membrane is....
a)
regulate what enters and leaves the cell.
b)
fight bacteria and viruses that enter the cell.
c)
make sure each cell reproduces 
d)
make sure each cell can move
11.

The majority of the plasma membrane is composed of ______.

a)

phospholipids

b)

proteins

c)

carbohydrates

d)

cholesterol

12.

What property does the phospholipid bilayer give to a plasma membrane?

a)

provides the barrier between the inside and outside of the cell

b)

communicates between cells

c)

conducts electrical impulses in nerve cells

d)

allows cells to bind to each other

13.

identify a glycolipid

a)

structure a

b)

structure d

c)

structure e

d)

structure g

14.

The cell membrane is _______________ permeable.

a)

selectively

b)

somewhat

c)

physically

d)

ionically

15.

What are the two parts of a phospholipid?

a)

head

b)

enzyme

c)

tail

d)

hormone

16.

The cell membrane is mostly made of what?

a)

Membrane-spanning Proteins

b)

Surface Proteins

c)

Phospholipids

d)

Carbohydrates

17.

The phospholipid head is _____________ & _____________

a)

Hydrophilic

b)

Hydrophobic

c)

Polar (+)

d)

Uncharged

18.

What type of protein assist in moving specific particles across the membrane?

a)

Membrane-spanning

b)

Surface

c)

Cholesterol

d)

Carbohydrates

19.

Identify cholesterol molecule

a)

structure a

b)

structure b

c)

structure h

d)

structure i

20.

identify a glycolipid

a)

structure a

b)

structure d

c)

structure e

d)

structure g

21.

Identify a peripheral protein

a)

structure a

b)

strucure b

c)

structure g

d)

structure h

22.

Plasma membranes are selectively permeable. This means

a)

anything can pass in and out

b)

the membrane regulates the passage of the material in and out of the cell

c)

glucose cannot enter the cell

d)

cholesterol cannot enter

23.

Which is NOT a function of the membrane?

a)

it forms a selective barrier

b)

it has receptors for chemical messages

c)

it is the control center of the cell

d)

it is involved in self recognition

24.

The fluid mosaic model describes a membrane consisting of

a)

a phospholipid bilayer with embedded proteins

b)

2 layers of phospholipids with proteins in between

c)

individual proteins and phospholipids that can drift

d)

both a and c

25.

Which structure is the hydrophilic polar head of the phospholipid molecule?

a)

F

b)

D

c)

C

d)

A1

26.

Which structure is the hydrophobic tail of the phospholipid molecule?

a)

E

b)

B

c)

G

d)

A2

27.

Part A of the picture is pointing to what part of the plasma membrane?

a)

Carbohydrates

b)

Phospholipids

c)

Proteins

d)

Cholesterol

28.

Have a nucleus

a)

Prokaryotic

b)

Eukaryotic

c)

Both

29.

Do not have organelles with membranes

a)

Prokaryotic

b)

Eukaryotic

c)

Both

30.

The phospholipid tail is _____________ & _____________

a)

Hydrophilic

b)

Hydrophobic

c)

Polar (+)

d)

Uncharged

31.

What type of protein assist in moving specific particles across the membrane?

a)

Membrane-spanning

b)

Surface

c)

Cholesterol

d)

Carbohydrates

32.

Have a nucleus

a)

Prokaryotic

b)

Eukaryotic

c)

Both

33.

Do not have organelles with membranes

a)

Prokaryotic

b)

Eukaryotic

c)

Both

34.

Name A

a)

Phospholipid

b)

Phospholipid bilayer

c)

Carbohydrate chain

d)

Globular protein

e)

Glycolipid

35.

Name B

a)

Glycoprotein

b)

Phospholipid bilayer

c)

Carbohydrate chain

d)

Globular protein

e)

Glycolipid

36.

Name C

a)

Glycoprotein

b)

Phospholipid bilayer

c)

Carbohydrate chain

d)

Globular protein

e)

Glycolipid

37.

Name D

a)

Cholesterol

b)

Phospholipid bilayer

c)

Carbohydrate chain

d)

Globular protein

e)

Glycolipid

38.

Glycolipids in P.M. are usually located at.... (P.M.= plasma membrane)

a)

Inner leaflet of P.M.

b)

Outer leaflet of P.M.

c)

Evenly distributed in both inner and outer leaflet of P.M.

d)

None of the above

39.

Sandwich model of P.M. was given by...

a)

Danielle & Davson

b)

Singer & Nicolson

c)

Grendel & Gorter

d)

De Duve

40.

Fluid Mosaic Model of P.M. was proposed by...

a)

Danielle & Davson

b)

Singer & Nicolson

c)

De Duve

d)

Gorter & Grendel

41.

The membrane protein that extend through both sides of lipid bilayer are...

a)

Intrinsic Proteins

b)

Extrinsic proteins

c)

Peripheral proteins

d)

All of above

42.

Unit membrane model of P.M. was given by...

a)

Robertson

b)

De Duve

c)

Watson

d)

Singer & Nicolson

43.

Most abundant lipid in plasma membrane is :

a)

Cholesterol

b)

Sterol

c)

glycolipid

d)

Phospholipids

44.

A poikilothermic organism living in the Arctic would have , compared to that organism living in the temperate hot climate zone , a plasma membrane richer in :

a)

Cholesterol

b)

Long chain fatty acids

c)

Protein

d)

Unsaturated Fatty Acids

45.

Liposome is :

a)

closed , solvent filled vesicles which have a single bilayer of fatty acid chain.

b)

closed , solvent filled vesicles which have a single layer of fatty acid chain.

c)

a structure made of protein.

d)

both a and b.

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