Cell n molecular final exam 2 Flashcards
False about splicing in Eukaryotes
It is preformed in the cytoplasm
Operons definition
Contain cluster of genes transcribed as single mRNA
White blood cells and neurons are different because
Neurons express some mRNAs that white blood cells do not
How does appropriate amino acid get attached to each tRNA
Amino acyl tRNA synthetases attached them
Which amino acid would tRNA anticodon 3’-CUU-5’ to carry
Glutamic acid
What is not complimentary to the DNA sequence it is transcribed from
Poly A tail
Diff cell types in multicellular organisms distinct characteristics result mainly from the differential regulation of the
Transcription of genes transcribed by RNA polymerase II
What do mRNA affect
Translation of specific genes
Combinatorial control of gene expression involves what
Groups of transcriptional regulators working together to determine the expression of a gene
Molecular nature of EVE genes regulatory region means that
There are 7 regulatory elements and each is sufficient for driving expression in a single stripe
Best description of microRNAs
Molecules that control gene expression by base pairing with specific mRNAs
Does not occur spontaneously in biological membranes
Switch between lipid layers
Ions most abundant inside of typical mammalian cell
K+
Gates channels involved in inhibitory synaptic signaling
Glycine- gated Cl- channels
What is required for secretion of neurotransmitters in response to action potential
Voltage gated Ca2+ channels
Na+ going into cell with staring omV signal membrane potential is
Positive
Mechanism for transduction for a G- protein coupled receptor
Initiating the exchange of bound GDP to GTP
Mechanism of transduction for receptor tyrosine kinase
Phosphorylation of receptor dimers on the intercellular side
Types of alteration that would prevent receptor dimerization
A mutation that prevents RGFR from binding to RGF
Activating enzyme for a cascade that uses CAMP as 2nd messenger
Adenyl Cyclase
When a G- protein coupled receptor activates G protein
The alpha subunit exchanges it’s bound GDP for GTP
All membrane of steroid hormone receptor family
Interact with signal molecules that diffuse through the plasma membrane
mRNA is read by the ribosome in the — direction and protein synthesized
5’ to 3’/ N terminus to C
Present in eukaryotic primary transcript but Not in mature mRNA
Introns
False about proteasome
Misfolded proteins are delivered to the proteasome where they assisted with refolding
