RNAS Practice Quiz 4.3 |20 Questions with Verified Answers
During transcription, RNA polymerase joins nucleotides
from 5′ to 3′.
from left
... [Show More] to right.
from 3′ to 5′.
from right to left. - CORRECT ANSWER from 5' to 3'
In bacteria, RNA polymerase transcribes
tRNA genes only.
protein-coding genes only.
rRNA genes and tRNA genes.
all types of genes. - CORRECT ANSWER all types of genes
In translation,
DNA is converted to RNA.
DNA is copied into DNA.
RNA is converted to protein.
RNA is converted to DNA. - CORRECT ANSWER RNA is converted to protein
Match the RNAs below with their function. Use each answer only once.
___ mRNA a. Facilitates attachment of amino acids by ribosomes.
___ tRNA b. Structural component of ribosomes.
___ rRNA c. Transcripts of protein-coding genes.
___ snRNA d. Maturation of transcripts.
mRNA (c); tRNA (a); rRNA (b); snRNA (d)
mRNA (d); tRNA (b); rRNA (c); snRNA (a)
mRNA (c); tRNA (b); rRNA (d); snRNA (a)
mRNA (a); tRNA (b); rRNA (c); snRNA (d) - CORRECT ANSWER mRNAc ; tRNA a ; rRNA b ; snRNA d
RNA molecules are
circular.
double-stranded.
single-stranded.
double helical. - CORRECT ANSWER single stranded
The consensus sequence for the -35 box of an E. coli promoter is
5′-A A C T G T-3′
5′-T T G A C A-3′
5′-T A T A A T-3′
5′-T T A A G A-3′ - CORRECT ANSWER 5'- TATAAT-3'
The DNA sequence of a gene is 3′-C C A T G C T A-5′. The corresponding sequence of the mRNA produced from this gene is
5′-C C A T G C T A-3′
3′-G G T A C G A T-5′
3′-A T C G T A C C-5′
5′-G G U A C G A U-3′ - CORRECT ANSWER 5' GGUACGAU 3'
The DNA sequence where RNA polymerase binds at the beginning of transcription is called the
promoter.
operator.
initiator.
terminator. - CORRECT ANSWER promoter
The major product of transcription is a molecule of
DNA.
RNA.
protein.
phospholipid. - CORRECT ANSWER protein
The term "pre-mRNA" refers to
genes at the DNA level, pre-transcription.
new, unprocessed mRNA of eukaryotes.
prokaryotic mRNA.
untranslated upstream regions of mRNA transcripts. - CORRECT ANSWER new, unprocessed mRNA of eukaryotes.
The ρ protein is involved in which aspect of transcription?
initiation
chain elongation
termination
transcription bubble formation - CORRECT ANSWER termination
Transcription and translation are coupled in
yeast.
humans.
bacteria.
protozoa. - CORRECT ANSWER bacteria
Which is a characteristic of a ρ-independent terminator?
ρ protein
hairpin loop followed by a string of U's
hairpin loop without a string of U's
a string of U's without a hairpin loop - CORRECT ANSWER hairpin loop without a string of U's
Which is the best representation of the cell cycle, as proposed by Francis Crick in 1953?
DNA DNA RNA
RNA protein DNA
DNA RNA protein
protein RNA DNA - CORRECT ANSWER DNA RNA protein
Which of the following is NOT a way in which RNA differs from DNA?
In RNA uracil replaces thymine.
RNA lacks a 2′ hydroxyl group
RNA is typically single-stranded.
RNA has nitrogenous bases bonded with the 1′ carbon. - CORRECT ANSWER RNA has a nitrogenous base bonded with the 1' carbon
Which of the following is not required for initiation of transcription?
NTPs
primer RNA sequence
RNA polymerase
template DNA strand - CORRECT ANSWER NTPs
Which of the following statements is true?
In eukaryotes, transcription takes place in the cytoplasm.
Eukaryotic genes lack introns.
Not all transcribed genes are translated to protein.
Genes can be transcribed in the 5′-3′ or 3′-5′ directions. - CORRECT ANSWER not all transcribed genes are translated to protein
Which subunit of the RNA polymerase holoenzyme is essential for recognition of the two consensus sequences in an E. coli promoter?
α-subunit
β-subunit
ρ factor
σ factor - CORRECT ANSWER σ factor
Which type of RNA is involved in the splicing of pre-mRNA molecules in eukaryotic cells?
rRNA
hnRNA
snRNA
gRNA - CORRECT ANSWER snRNA
Which type of RNA polymerase sigma factor predominates during the heat shock response?
σ70
σ54
σ23
σ32 - CORRECT ANSWER σ32 [Show Less]