ETS major field test in biology Questions
And Answers
Pyrimidine dimers formed in DNA due to UV radiation can be
repaired by?
SOS repair
Double strand break repair
Mismatch repair
Photoreactivation repair (nucleotide excision repair)
Base excision repair -
correct answer ✅Photoreactivation repair (nucleotide excision
repair)
Which of the following repair mechanisms uses methyl groups to
distinguish between parental and daughter strands?
Answers:
Mismatch repair
Photoreactivation repair (Nucleotide excision repair)
SOS repair
Double strand break repair
,ETS major field test in biology Questions
And Answers
Base excision repair -
correct answer ✅Mismatch repair
Which of the following types of molecules is always found in
virions?
Answers:
Protein
RNA
Lipid
DNA
Carbohydrate -
correct answer ✅Protein
A Barr body found within the female mammalian cell's nucleus is an
example of ___
Answers:
Euchromatin
Polytene chromosome
Pseudogenes
Heterochromatin
,ETS major field test in biology Questions
And Answers
Cistron -
correct answer ✅Heterochromatin
In vertebrate genes, transcription regulatory regions that contain
CpG islands are inactivated by which CpG modification?
Answers:
Methylation
Ubiquitination
Acetylation
Phosphorylation
Myristoylation -
correct answer ✅Methylation
TATA-binding protein (TBP) is a key transcription factor in
eukaryotes. A schematic representation of the 240-amino acid TBP
of yeast is shown in Fig. 1 below, with the positions of 2 mutations
indicated. The boxed area represents the evolutionarily conserved
C-terminal domain of TBP, and the shaded (dark) regions of this
domain represent two repeated elements involved in DNA binding.
One mutation (P65S) changes proline 65 to serine and the other
I143N changes isoleucine 143 to asparagine. Fig. 2 below
represents autoradiographs of gels containing RNA transcripts
, ETS major field test in biology Questions
And Answers
produced in extracts of wild type or mutant cells. Lanes 1-2 are
from wild-type yeast (WT), lanes 3-4 are from the I143N mutant
and lanes 5-6 are from P65S mutant, as indicated. Fig. 2A shows
transcripts of a gene transcribed by RNA polymerase I (Pol I). Fig. 2B
shows transcripts of a gene transcribed by RNA polymerase II (Pol
II). Fig. 2C shows transcripts -
correct answer ✅Whether mutant transcription phenotypes are
due to perturbation of TBP function.
A set of genes from Bacillus subtilis that encode the proteins
required for sporulation have conserved DNA sequences -35 and -
10 nucleotides before the site of transcript initiation. However, the
sequence at -35 is different from that seen in most other genes
from that species. Which of the following best explains this
difference?
Answers:
Transcription of these genes is induced by cAMP
Translation of the mRNAs transcribed from these genes requires
specific ribosomes that recognize a modified Shine-Dalgarno
sequence
A novel sigma factor is required for transcription initiation at these
genes
The -35 sequence is the binding site for a repressor of transcription
And Answers
Pyrimidine dimers formed in DNA due to UV radiation can be
repaired by?
SOS repair
Double strand break repair
Mismatch repair
Photoreactivation repair (nucleotide excision repair)
Base excision repair -
correct answer ✅Photoreactivation repair (nucleotide excision
repair)
Which of the following repair mechanisms uses methyl groups to
distinguish between parental and daughter strands?
Answers:
Mismatch repair
Photoreactivation repair (Nucleotide excision repair)
SOS repair
Double strand break repair
,ETS major field test in biology Questions
And Answers
Base excision repair -
correct answer ✅Mismatch repair
Which of the following types of molecules is always found in
virions?
Answers:
Protein
RNA
Lipid
DNA
Carbohydrate -
correct answer ✅Protein
A Barr body found within the female mammalian cell's nucleus is an
example of ___
Answers:
Euchromatin
Polytene chromosome
Pseudogenes
Heterochromatin
,ETS major field test in biology Questions
And Answers
Cistron -
correct answer ✅Heterochromatin
In vertebrate genes, transcription regulatory regions that contain
CpG islands are inactivated by which CpG modification?
Answers:
Methylation
Ubiquitination
Acetylation
Phosphorylation
Myristoylation -
correct answer ✅Methylation
TATA-binding protein (TBP) is a key transcription factor in
eukaryotes. A schematic representation of the 240-amino acid TBP
of yeast is shown in Fig. 1 below, with the positions of 2 mutations
indicated. The boxed area represents the evolutionarily conserved
C-terminal domain of TBP, and the shaded (dark) regions of this
domain represent two repeated elements involved in DNA binding.
One mutation (P65S) changes proline 65 to serine and the other
I143N changes isoleucine 143 to asparagine. Fig. 2 below
represents autoradiographs of gels containing RNA transcripts
, ETS major field test in biology Questions
And Answers
produced in extracts of wild type or mutant cells. Lanes 1-2 are
from wild-type yeast (WT), lanes 3-4 are from the I143N mutant
and lanes 5-6 are from P65S mutant, as indicated. Fig. 2A shows
transcripts of a gene transcribed by RNA polymerase I (Pol I). Fig. 2B
shows transcripts of a gene transcribed by RNA polymerase II (Pol
II). Fig. 2C shows transcripts -
correct answer ✅Whether mutant transcription phenotypes are
due to perturbation of TBP function.
A set of genes from Bacillus subtilis that encode the proteins
required for sporulation have conserved DNA sequences -35 and -
10 nucleotides before the site of transcript initiation. However, the
sequence at -35 is different from that seen in most other genes
from that species. Which of the following best explains this
difference?
Answers:
Transcription of these genes is induced by cAMP
Translation of the mRNAs transcribed from these genes requires
specific ribosomes that recognize a modified Shine-Dalgarno
sequence
A novel sigma factor is required for transcription initiation at these
genes
The -35 sequence is the binding site for a repressor of transcription
