Question is ⇒ The binding of lac repressor to DNA could be considered to be analogous to, Options are ⇒ (A) competitive inhibition of an enzyme, (B) mixed-type inhibition of an enzyme, (C) uncompetitive inhibition of an enzyme, (D) allosteric effects in enzyme regulation, (E) , Leave your comments or Download question paper.

Question is ⇒ The binding of lac repressor to DNA could be considered to be analogous to, Options are ⇒ (A) competitive inhibition of an enzyme, (B) mixed-type inhibition of an enzyme, (C) uncompetitive inhibition of an enzyme, (D) allosteric effects in enzyme regulation, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	The binding of lac repressor to DNA could be considered to be analogous to
A.	competitive inhibition of an enzyme [Correct Answer]
B.	mixed-type inhibition of an enzyme [Wrong Answer]
C.	uncompetitive inhibition of an enzyme [Wrong Answer]
D.	allosteric effects in enzyme regulation [Wrong Answer]
View Answer 2 -1 Explanation:- Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

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⇒ Transcription begins
at the start codon
upstream from the start codon
downstream from the start codon
none of these

⇒ Transcription factors are
promoters
proteins which bind to DNA and regulate transcription
TATA boxes
CATT boxes

⇒ The transcriptional regulatory proteins in eukaryotes which induce transcription usually have
at least two distinct domains of protein structure, a DNA binding domain and an activation domain
at least two distinct domains of protein structure and a DNA binding domain
at least one distinct domains of protein structure, a DNA binding domain and an activation domain
none of these

⇒ The nucleons of eukaryotic cell has
RNA polymerase I
RNA polymerase II
RNA polymerase III
all of these

⇒ The regions of a gene located at -10 and -35, with respect to the start of transcription, are termed
start codons.
oriC regions.
Shine Dalgarno sequences.
promoters.

⇒ Most transcripts of protein coding genes are cleaved
at the 3' end just after a poly adenylation signal
at the 3' end just before a poly adenylation signal
at the 5' end immediately after a poly adenylation signal
at the 5' end immediately before a poly adenylation signal

⇒ In prokaryotes, transcription is
terminated by the stop codon
terminated by a protein called rho
terminated by a poly A sequence
terminated by a start codon

⇒ Rho-dependent termination of transcription in E. coli
requires ATP
requires about 50 nucleotides of uncomplexed mRNA
both (a) and (b)
removes mRNA and holoenzyme from the DNA

⇒ Transcription of each set of rRNA genes by RNA polymerasel produces
a single 45S rRNA precursor molecule
a single 5S rRNA precursor molecule
a single 18S rRNA precursor molecule
a single 28S rRNA precursor molecule

⇒ Promoters for tRNAs are located
upstream from the start codon
downstream from the start codon
both (a) and (b)
none of these

⇒ RNA polymerase holoenzyme initiates transcription which involves
recognition of the -10 sequence and -35 sequence
recognition of the -10 sequence only
recognition of the -35 sequence only
none of the above

⇒ Immediately after transcription
a methylated guanine cap is added to the 51 end of the transcript
a methylated guanine cap is added to the 31 end of the transcript
both (a) and (b)
a poly adenylation signal is added

⇒ Which of the following conditions would cause the release of the lac repressor protein from the lac operator site on DNA?
Presence of glucose in the growth media
Presence of lactose in the growth media
Presence of IPTG (isopropyl thiogalactoside) in the growth media
Both (b) and (c)

⇒ The closed complex at bacterial promoters is
in equilibrium with free RNA polymerase and the promoter
not affected by promoter mutations
bound more tightly when repressors are present
not affected by activator proteins

⇒ Multiple copies of 5S genes, located at a chromosomal site distinct from the other rRNA genes
are transcribed by rRNA polymerase III and the 5S rRNA
are transcribed by rRNA polymerase II
are transcribed by rRNA polymerase I and the 5S rRNA
are transcribed by DNA polymerase I

⇒ Transcription results in
an amino acid chain
messenger RNA
complementary DNA
Okazaki fragments

⇒ The binding of lac repressor to DNA could be considered to be analogous to
competitive inhibition of an enzyme
mixed-type inhibition of an enzyme
uncompetitive inhibition of an enzyme
allosteric effects in enzyme regulation

⇒ Upstream regions which are essential for correct transcription are called
enhancers
start codons
promoters
transcription factors

⇒ The RNA polymerases that transcribe bacterial DNA are
multisubunit enzymes
only active inside the cell
interchangable with DNA polymerases
highly glycosylated in their active forms

⇒ The major function of RNA polymerase's sigma factor is
recognition of the translational stop sequence
recognition of the transcriptional start sequence
recognition of the transcriptional stop sequence
recognition of the translational start sequence

⇒ In both eukaryotes and prokaryotes, a promoter region that is rich in AT bases is called as
CATT
Shine Dalgarno region
TATA box
SV40 region

⇒ Transcription by E. coli polymerase occurs in
four phases known as initiation, propagation, elongation and termination
three phases known as initiation, elongation and termination
two phases known as initiation and termination
none of the above

⇒ The function of the sigma factor of RNA polymerase is to
assure that transcription begins at the proper point
assure that transcription ends at the proper point
assure that translation begins at the proper point
assure that translation ends at the proper point

⇒ RNA is synthesized on a DNA template in a process called __________ , which utilizes the enzyme __________
translation, RNA polymerase
transcription, DNA polymerase
transcription, RNA polymerase
replication, DNA polymerase

⇒ What is a promoter?
A specific sequence of DNA to which a catabolic repressor binds
A specific sequence of DNA to which RNA polymerase binds
A specific DNA sequence to which a restriction endonuclease binds
None of the above

⇒ Which of the following is necessary for transcription to occur?
DNA molecule
RNA polymerase
DNA polymerase
Both DNA & RNA polymerase

⇒ Each tRNA molecule has a cloverleaf secondary structure consisting of
three stem loops
two stem loops
four stem loops
either (a) or (b)

⇒ The complex of RNA polymerase, DNA template and new RNA transcript is called
transcription bubble
replication bubble
a translation bubble
none of these

⇒ In eukaryotes, there are three different RNA polymerases. The RNA polymerase responsible for transcription of mRNA is
RNA polymerase I
RNA polymerase II
RNA polymerase III
none of these

⇒ Enhancers are regions that
bind RNA polymerase
are adjacent to the TATA box
are CAT box binding proteins
modulate transcription