prokaryotes and eukaryotes orgnaelles Flashcards
Which of the following statements is FALSE about microtubles?
A They are made of G-actin monomer
B They have a diameter of 25nm
C They are polar
D They play a role in the transport of vesicles and organelles
E strucutre is hollow tube
OPTION A
Microtubules are made of an arrangement of α- and β-tubulin dimers
What protein(s) causes the inwards folding of the cell membrane to for form an internalised vesicle? Actin Clathrin Tubulin Lamin Dyenin
Clathrin + Dyenin
eukaryotic cell membrane has specific receptor molecule.
when bound, triggers the formation of a Clathrin Coat (protein coat complex).
The conformation of the Clathrin on the inside of the cell forces the membrane to bend inwards causing the formation and internalisation of a vesicle.
Which of the following are examples of intermediate filaments:
A keratin, actin, desmin, myosin.
B keratins, vimentin, lamins, desmin
C hemoglobin, collagen, titin, vimentin
D lamins, collagen, globulin, actin, tubulin.
E none of the above
OPTION B
Keratins are found in epithelial cells and provide strength to the cells; Vimentin are found in connective tissue and provide shape to the structure; Lamins are found in all cells and represent the nuclear scaffold; Desmin are found in muscle cells and give structural support
Actin and myosin are microfilaments.
Hemoglobins are protein tetramers Globulins are subunits of hemoglobin.
Collagens are extracellular protein
Which of the following are function(s) of smooth ER? A calcium storage B synthesis and modification of proteins C detoxification D synthesis of steroids E all of hem
A, C, D
> protein is ER as smoothER lacks ribosomes!
what is the nucleolus comprised of
Nucleolus is composed of rRNA, ribosomal protein subunits, and DNA.
What is the role of pili in a bacterial cell?
A Used for movement and attachment
B Transfer of genetic information between 2 bacterial cells
C Used to anchor the cell wall to the cell membrane
D Helps the cell move
OPTION B
useful in conjugation
Which of these does a gram negative bacterial cell wall NOT have?
A Thin peptidoglycan layer
B Periplasm
C Membrane on either side of peptidoglycan
D Thick peptidoglycan layer
OPTION D
gram- has an outer membrane, then the periplasm which contains a thin layer of peptidoglycan, followed by the inner membrane
Which of these is not true about an archaeal cell membrane?
A Hydrocarbon chains attached by ester linkages
B Hydrocarbon chains attached by ether linkages
C Hydrophobic side chains are composed of isoprene
D Glycerol is chiral
OPTION A
ether lingages for archaea
> also hydrocarbon chain are branched in archea membrane
Which of these prokaryotic cellular appendages can be peritrichous, polar or lophotrichous? Pilli Plasmid Flagella Fimbriae
lagella are the whiplike structures that help cell motility. They can be located in three positions on the cell.
The nuclear pore complex
A permits free communication between the nucleus and the cytoplasm
B is bridged by a unit membrane
C is located only at specific nuclear pore sites
D permits passage of proteins via receptor-mediated transport
E has a luminal ring that faces the cytoplasm
A Communication through NPC is not free, it is regulated.
B NPC is formed by proteins.
C NPC scatters all over the nuclear membrane.
D: Correct.
E Luminal ring of the NPC is within the protein-line channel
Which of these prokaryotic cellular appendages can be peritrichous, polar or lophotrichous? Pilli Plasmid Flagella Fimbriae
lagella are the whiplike structures that help cell motility. They can be located in three positions on the cell.
which bacteria shape is egg/shepical
rod
corcscrew
coccus
coccus
around 1um
what is peptidoglycan made of?
polymer of NAG and NAM and b1-4 link
> archea is NAG NAT b1-3 link
what do antibiotics targer?
cell wall but also the DNA repolcation/ ribosomes and also certain protien sysnthesis processes to stop certain aminoacids being made
which organelle is continuous with the nuclear membrane?
the ER! - large tubular membrane system
