ETS major field test in biology Questions with Complete Solutions (Latest 2025) 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 Answers ✅Photoreactivation repair (nucleotide excision repair) Which of the following repair mechanisms uses methyl groups to distinguish between parental and daughter strands?
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Mismatch repair Photoreactivation repair (Nucleotide excision repair) SOS repair Double strand break repair Base excision repair - Correct Answers ✅Mismatch repair Which of the following types of molecules is always found in virions?
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Protein 1 / 4
ETS major field test in biology Questions with Complete Solutions (Latest 2025) RNA Lipid DNA Carbohydrate - Correct Answers ✅Protein A Barr body found within the female mammalian cell's nucleus is an example of ___
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Euchromatin Polytene chromosome Pseudogenes Heterochromatin Cistron - Correct Answers ✅Heterochromatin In vertebrate genes, transcription regulatory regions that contain CpG islands are inactivated by which CpG modification?
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Methylation Ubiquitination Acetylation Phosphorylation Myristoylation - Correct Answers ✅Methylation 2 / 4
ETS major field test in biology Questions with Complete Solutions (Latest 2025) 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 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 Answers ✅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?
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Transcription of these genes is induced by cAMP 3 / 4
ETS major field test in biology Questions with Complete Solutions (Latest 2025) 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 The replication of these genes requires a specifically modified DNA polymerase. - Correct Answers ✅A novel sigma factor is required for transcription initiation at these genes Which of the following repair mechanisms is often mutagenic?
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Mismatch repair Photoreactivation repair (Nucleotide excision repair) Base excision repair SOS repair - Correct Answers ✅SOS repair The polytene chromosomes seen in Drosophila are
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Multiple copies of a single chromosome Produced by repeated rounds of DNA replication followed by nuclear division Produced only after the completion of mitosis
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