MCQ past papers Flashcards
What will be labeled in direct histocytochemistry?
a) Primary antibody
b) Secondary antibody
c) Antigen
d) The cell
a) Primary antibody
What acts on the lagging DNA strand DNA duplication?
a) Kinase
b) Phosphatase
c) Helicase
d) DNA Ligase
d) DNA Ligase
Where do you find grains in H3-uracil autoradiography?
a) In the photo-emulsion layer above the nucleus and cytoplasm
b) Above Golgi
c) Above the lysosomes
d) Above the secretory vesicles
a) In the photo-emulsion layer above the nucleus and cytoplasm
What is the specific staining for enzymes?
a) H&E
b) Enzyme histochemistry
c) Aoyama methode
d) Silver impregnation
b) Enzyme histochemistry
What is not true for trimeric G-proteins?
a) Composed of alpha, beta and gammasubunits
b) Acts during hormone binding to its membrane receptor
c) Alpha subunits bind guanine phosphate
d) GTP binds to the alpha subunit
c) Alpha subunits bind guanine phosphate
What is used to stain enzymes? a) Azo dye b) PAS reaction c) Feulgen reaction D) Schiff base
a) Azo dye
Which zones get smaller during muscle contraction? a. Z-line B. I-band c. M-line d. A-band
B. I-band
What is true for SPF?
a) It is active during anaphase
b) It is composed of a double phosphorylated cycline
c) It acts during the M phase of the cell cycle
d) Gets cell to S phase
d) Gets cell to S phase
What is the signal for apoptosis?
a) Inflammation
b) Phosphatidylserine moves to the outer layer of the lipid membrane
c) Necrosis of the neighboring cell
d) Immune response
b) Phosphatidylserine moves to the outer layer of the lipid membrane
Lysosomes contain:
a) Only hydrolytical enzymes
b) Only materials for digestion
c) Enzymes (hydrolases) and material for digestion
d) Undigested remnants
c) Enzymes (hydrolases) and material for digestion
What is cut for TEM?
a) Microtome witch can cut sections to a thickness of 10 micro. m.
b) Sledge microtome with a steal blade
c) Ultramicrotome with a glass (or diamond) knife
c) Ultramicrotome with a glass (or diamond) knife
What is essential in cell culture?
a) Nutrients in the medium, ph, temperature, gas etc.
b) Acidic medium containing g-proteins for cell signaling
c) Basic medium containing isotopes for detection of cell mortality
d) Natural medium and continuous shaking
a)Nutrients in the medium, ph, temperature, gas etc.
What do SRP do?
a) Binds to the signal peptide and ribosome and transport the mRNA and ribosome to the surface of the rER
b) Bind a poly-A tail to an mRNA
c) Responsible for O-glycosylation of oligosaccharide chains
d) Enhance the protein entering the Golgi
a) Binds to the signal peptide and ribosome and transport the mRNA and ribosome to the surface of the rER
What is true in connection to proto-oncogenes?
a) Code the protein which stimulates the cell to proliferate
b) The mutated form stopped during mitosis
c) It is inactive in tumor cells
d) It is not transcribed in tumor cells
a) Code the protein which stimulates the cell to proliferate
What is true for proteasomes?
a) They are the result of receptor-mediated endocytosis
b) It is a Golgi transport vesicle
c) It is a type of lysosome
d) They degrade the ubiquitinated proteins
d) They degrade the ubiquitinated proteins
What is true for the centrioles?
a) Cdk is responsible for its dublication
b) 9x3 microtubules are found inside it
c) The duplication occurs during the G1 phase
d) 2 Tubules are in the center of it
c) The duplication occurs during the G1 phase
Passiv diffusion occurs:
a) Without need for any energy
b) With the need of energy in the form of ATP
c) With the need of energy in the form of GTP
d) With the aide of transporter proteins
a) Without need for any energy
Constitutive secretion occurs:
a) During endocytosis
b) In the triggered cells
c) In all eukaryotic cells
d) During endomitosis
c) In all eukaryotic cells
What passes through the plasma membrane by simple diffusion?
a) Polypeptides
b) O2, Co2 (gas)
c) Small protein
d) Signal molecules
b) O2, Co2 (gas)
What is not true for mitochondria?
a) Transport vesicles with the mitochondrial proteins enter into the mitochondria
b) Nuclear DNA codes a part of the mitochondrial proteins
c) The proteins enter into the mitochondria by TIM and TOM
d) The enzymes of the citrate acid cycle are found in th matrix
a) Transport vesicles with the mitochondrial proteins enter into the mitochondria