🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →

HomeClass Notes1,200,000US530,000

BIOSC 0160 Lecture Notes - Lecture 7: Alanine, Peptide, Interrupt

49 views1 pages

25 Oct 2017

School

Department

Biological Sciences

Course

Professor

Candice Damiani

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Lecture 7: transcription: rna poly unwinds dna, does not proofread and correct mistakes. This is why we have mistakes in proteins: reads template 3" 5", but builds 5" 3", adds nucleotides. Termination: stretch of nucleotides in the dna that codes for the termination of transcription. Pulls the rna poly, destablizes the dna/rna interactions: may have some of it in the transcript, but most of it is not included in transcript. Transcription of a eukaryotic gene: prokaryotes don"t have modifications to their mrna, only eukaryotes, 5" cap is added while transcription is still happening. Modified gtp, added right on the +1 site: 3" poly(a) tail: added where the termination sequence would have been, extend the length of the mrna transcript. About 100-300 adenines added: mrna transcripts that have a longer polya tail are more stable in the cytoplasm and will have a longer life.

Related Documents

BIOSC 0160 Lecture Notes - Genetic Code, Peptide, Methionine

salmonrhinoceros513

BIOSC 0160 Lecture 13: Eukaryotic Regulation of Gene Expression (Cont.)

BIOSC 0160 Study Guide - Midterm Guide: Deoxyribonuclease, Dna Supercoil, Leucine Zipper

champagnebuffalo70

Related Questions

If one is testing a goodness of fit to a 9:3:3:1 ratio, how many degrees of freedom would be associated with the Chi-square?

1

2

3

4

not enough information to determine

Which of the following choices does not describe a type of posttranslational modification of proteins?

The amino terminal methionine may be removed.

Glycoproteins are produced by the attachment of phosphates to newly synthesized proteins.

Precursor proteins are cleaved and trimmed by protease enzymes to produce a functional protein.

Molecular chaperones help proteins fold correctly.

Amino acids in the amino terminal of the protein can be acetylated.

A eukaryotic DNA sequence that affects transcription at distant promoters is called a(n)

long distance promotor

DNA methylation may be a significant mode of genetic regulation in eukaryotes. Meythylation refers to

altering RNA polymerase activity by adding methyl-groups

changes in DNA-DNA hydrogen bonding

altering translation activity via methylated tRNAs

adding methyl groups to certain cytosines in DNA

If a nucleotide lacks a 3â-OH group, what will happen?

itâs transformed into RNA

another nucleotide can bond at the 3â site during replication

replication will halt

Which of the following describe posttranscriptional modifications commonly seen in mRNA of eukaryotes?

5â capping, 3â-poly-A tail addition, splicing

3â capping, 5â poly-A tail addition, splicing

heteroduplex formation

5â capping, 3âpolyA tail addition, removal of exons

In birds, females are the heterogametic sex. This means that

females have chromosomes in pairs.

emales produce eggs.

females determine the gender of their offspring.

males have two identical sex chromosomes (ZZ)

An anticodon on a tRNA has the sequence 5'âGCAâ3'. What would be the effect on translation if the G in the anticodon were mutated to a U?

The anticodon could pair to the serine codon 5'âUCAâ3', and a cysteine would be incorporated at all points where a serine should have been incorporated.

The anticodon could pair to the threonine codon 5'âACUâ3', and a threonine would be incorporated at all points where a cysteine should have been incorporated.

The anticodon could pair to the serine codon 5'âAGUâ3', and a serine would be incorporated at all points where a cysteine should have been incorporated.

The anticodon could pair to the stop codon 5'âUGAâ3', and instead of stopping translation, a cysteine would be incorporated and translation could continue.