MCQ

Question 1

What are the major characteristics of the facilitated diffusion?
A: This process provides a facilitated transport of molecules without energy and transmembrane proteins
B: This is an active transport that facilitates the transport of glucose across the plasma membrane
C: It is the process of passive transport via transport protein
D: It is mediated only by ion channels
E: Molecules and ions move against their concentration gradient

Answer 1

C: It is the process of passive transport via transport protein

Question 2

In general it requires active membrane transport:
A:Uptake of LDL
B: Glucose uptake by facilitated diffusion
C: Ca2+ transport via ion channels
D: Transport of nucleotids
E: Engulfing of microorganisms

Answer 2

D: Transport of nucleotids

Question 3

What is in the Fibrillar center (pars amorpha)?
A: rDNA
B: pre-rRNA
C: pre-ribosomes
D:Ribosomes
E: None of them

Answer 3

B: pre-rRNA

Question 4

Role of SRP (Signal recognition particle)
A: Nucleo-cytoplasmic transport
B: Recognition of NLS
C: Recognition of NES
D: Recognition of ER signal sequence
E: Proteolysis of ER signal sequence

Answer 4

A: Nucleo-cytoplasmic transport

Question 5

Characteristic to an acidic dye
A:Stains acidic components of the cell
B: Stains metachromatically eg heparin
C: Cresyl-violett is an acidic dye
D: It detects several cytoplasmic proteins as well as histones
E: In some cases we can use these dyes as a fixative

Answer 5

D: It detects several cytoplasmic proteins as well as histones

Question 6

We DO NOT use it as a chemical fixative:
A: Ethylalcohol
B: Formaldehyde
C:Epoxy resin
D: Heavy metals salts
E:Methylalcohol

Answer 6

C:Epoxy resin

Question 7

Which of the following is INCORRECT pairing:
A: Cytoskeleton - consist of three types of fibers that provide support, shae and mobility
B: Lysosome - organelle for intracellular digestion
C: SER - organelle that produces phospholipids
D: Golgi - organelle that modifies proteins and lipids
E: Mitochondria organelle that contains 80 S ribosomes

Answer 7

E: Mitochondria organelle that contains 80 S ribosomes

Question 8

Histone proteins:
A: Core region of nucleosomes formed by trimerization
B: The distance between these proteins is aboute 60 bp
C: They have a role also in regulation of translation
D:They are organized around the constitutive hetrochromatin
E: Majority of these proteins is phylogenetically well conserved

Answer 8

E: Majority of these proteins is phylogenetically well conserved

Question 9

Reaction characteristic to the medial golgi:
A: Glycosylation with mannose 6 phosphate signal
B: Removal of glucose residues
C: Removal of some non phosphorylated mannose residues
D: Synthesis of phospholipids
E: Cleavage of dolichol

Answer 9

C: Removal of some non phosphorylated mannose residues

Question 10

Characteristic to caveolas:
A: They are covered by clathrin layer
B: They possess coatomer-coverage
C: COP proteins are their building elements
D: They participate in macropinocytosis
E: They participate in potocytosis

Answer 10

E: They participate in potocytosis