Quiz 19: Ribosomes and Transfer Rna

The crystal structure of IF1 bound to the 30S ribosomal subunit shows that IF1 binds to the _____________ of the ribosome. A)E site B)P site C)A site D)allosteric site E)S15 protein

Match the following levels of tRNA structure with the descriptions below. A.Primary structure B.Secondary structure C.Tertiary structure D.Quaternary structure E.1-dimensional structure -The tRNA nucleotide base sequence.A

Match the following levels of tRNA structure with the descriptions below. A.Primary structure B.Secondary structure C.Tertiary structure D.Quaternary structure E.1-dimensional structure -The three-dimensional shape of tRNA.C

Match the following levels of tRNA structure with the descriptions below. A.Primary structure B.Secondary structure C.Tertiary structure D.Quaternary structure E.1-dimensional structure -The formation of a stem loop structure by nucleotide base pairing.B

Match the following levels of tRNA structure with the descriptions below. A.Primary structure B.Secondary structure C.Tertiary structure D.Quaternary structure E.1-dimensional structure -The "clover-leaf" structure of tRNA.B

Match the following levels of tRNA structure with the descriptions below. A.Primary structure B.Secondary structure C.Tertiary structure D.Quaternary structure E.1-dimensional structure -tRNA that resembles an inverted L.C

Match the major regions found on a tRNA molecule with their correct description. A.acceptor stem B.D loop C.T loop D.variable loop E.anticodon loop Section: 19.02 -This portion of tRNA contains a number of modified uracils.B

Match the major regions found on a tRNA molecule with their correct description. A.acceptor stem B.D loop C.T loop D.variable loop E.anticodon loop Section: 19.02 -This portion of tRNA base pairs with mRNA.E

Match the major regions found on a tRNA molecule with their correct description. A.acceptor stem B.D loop C.T loop D.variable loop E.anticodon loop Section: 19.02 -This portion of tRNA varies in length from 4 to 13 nucleotides.D

Match the major regions found on a tRNA molecule with their correct description. A.acceptor stem B.D loop C.T loop D.variable loop E.anticodon loop Section: 19.02 -This portion of tRNA has a terminal sequence of 5-CCA-3.A

Match the major regions found on a tRNA molecule with their correct description. A.acceptor stem B.D loop C.T loop D.variable loop E.anticodon loop Section: 19.02 -This portion of tRNA contains the sequence TC.C

Biochemical and genetic experiments have demonstrated that the _________ of tRNA are important for recognition by its cognate aminotransferase-tRNA synthetase. A)D loop and T loop B)T loop and variable loop C)anticodon loop and T loop D)acceptor stem and anticodon loop E)variable loop and D loop

The crystal structure of the Thermus thermophilis 70S ribosome reveals that the binding sites for tRNA are composed primarily of ______________.

Eukaryotic cytoplasmic ribosomes are more ___________ than prokaryotic ribosomes.

The E.coli 70S ribosome contains _________ proteins and ________ rRNAs.

Spectinomycin and paromomycin are antibiotics that were used to help determine the ___________ and ___________ functions of the 30S ribosomal subunit.

The exit tunnel walls of the 50S ribosomal subunit are made of _______,which probably helps the hydrophobic side chains of the nascent polypeptide to slide through easily.

An mRNA with many ribosomes transversing it at the same time is called a ___________.

The T loop of tRNA contains the modified nucleoside ____________,represented by the Greek letter .

Aminoacyl-tRNA synthetases contain both an active site and a(n)___________ site.

X-ray crystallography studies have shown that tRNAs interact with the 30S ribosomal subunit through their _________ and with the 50S ribosomal subunit through their __________.

Eukaryotic organelle ribosomes are ______________ than prokaryotic ribosomes.

The antibiotic _____________ is thought to inhibit translocation by blocking pivoting of the ribosomal head region.

The antibiotic streptomycin appears to increase the error rate of translation by interfering with the initial codon-_______ recognition and with proofreading.

The crystal structure of the Thermus thermophilis ribosome revealed that the twelve contacts between the subunits are mostly mediated by ribosomal proteins.

Upon binding to a ribosome,an aminoacyl-tRNA first enters in the A/T with its anticodon in the decoding site of the 30S particle and its acceptor stem still bound to EF-Tu.

tRNAs contain a number of modified bases that have been shown to be necessary for tRNA function.

In prokaryotes,transcription and translation are coupled and therefore polysomes can be found associated with active genes.

There are two classes of aminoacyl-tRNA synthetases,each approaches the tRNA molecule from the same side.

The sequence of the 16S rRNA can be used to determine evolutionary relatedness between organisms.