Cell bio test corrections Flashcards
What is the role of type I collagen ?
Skin, tendon, bone ,ligaments, dentine and Interstitial tissues
What is the role of type II collagen ?
Cartilage
vitreous humor
What is the role of type III collagen ?
Skin, Muscle and blood vessels
What is the role of type IV collagen ?
Basal lamina
What is the role of type V collagen ?
Foetal membranes and placenta
Which is sheet forming collagen ?
type IV
Which types of collagen are similar to type I ?
I and III
What is the most common cause of gene deletion ?
UV light
What is the structure of GAGs ?
Repeating polysacharide unit
amino sugar
glucorinic acid
Where can you find GAGs ?
connective tissue
Where does the large sub unit bind to initially in translation ?
methionine codon
Where does the small subunit bind to initially in transcription ?
5’ cap
Where does RNA polymerase bind to in transcription initially ?
promoter
What is vimentin ?
an intermediate filament
What is heterochromatin ?
more tightly wound DNA - gene silencing
What type of receptor allows cyclic AMP production ?
G protein coupled receptor
What is a key feature of phospholipids ?
amphipathic
What is the difference between eukaryotes and prokaryotes in the number of RNAs they have ?
Eukaryotes- 3 RNAs
Prokaryotes- 1 RNA
What is the contractile ring made of ?
actin
What is prometaphase ?
nuclear envelope disassembles
chromosomes join to the spindle
What is the origin of epithelial tissue ?
ectoderm
What is the structure of connective tissue ?
mainly collagen interwoven with elastin
What cells secrete collagen ?
fibroblasts
How is elastin deposited ?
fibrillin acts as a scaffold for elastin deposition q
How is collagen joint to actin ?
fibronectin is joint to collagen which is joint to actin via integrin dimers
Where can you find teichoic acids and lipid teichoic acids ?
gram positive cell wall
What is the mitotic spindle made of ?
microtubules
How are CDKs switched off ?
when cyclin is detroyed by anaphase promoting complex - tags with ubiquitin
What are the proteins in tight junctions ?
claudins and occludins
What are the proteins in gap jucnrions ?
connexons
What are the types of proteins in anchoring junctions ?
adherins and cadherins
What are cilia made of ?
microtubules
What is histone 1 ?
linker histone
brings nucleosomes closer together yo form more condensed fibre
What are the differences between prokaryotes, mitochondria and eukaryotes ?
prokaryotes and mitochondria do binary fission whilst eukaryotic cells use mitosis
eukaryotic cells arent invovled in energy production whilst mitochondria and prokaryotes use oxidative phosphorylation
Mitochindria and prokaryotes have 70S ribsomes whilst eukaroytic cells have 80S ribosomes
mitochindria and prokaryotes hace circualr DNA ehislr eukaroytes have linear DNA
What are the bacterial cytoskeletal proteins ?
actin - MreB- mitotic spindle
tubulin- FtsZ- contractile ring