Gene Regulation Welcome to your Gene regulation question series Which of the following is essential for the binding of ‘DNA binding proteins’ to the DNA Affinity Specific DNA binding domains Both None None Which of the following is a sign of an active chromatin region Positioning of nucleosomes Presence of histone variant proteins And Covalent modification of histone All of the above None Why trp operon mRNA has low half life High concentrations of intracellular RNases To rapidly respond to changing needs of the amino acids. Translation of that mRNA is not required for longer time None of the above None Which of the following is not a DNA-binding motif Helix-turn-helix Zinc finger Homeodomain Leucine zipper None Cellular concentration of different housekeeping genes vary widely True False None Which of the following nucleotide base contributes to the specificity based upon the contact of a non-polar group Thymine Adenine Cytosine Arginine None Which of the following is true about aptamers They are oligonucleotides They form a defined structures and binds specifically to the target molecule They can be used as an antagonists All of the above. None RNA polymerases can be specifically targeted to certain types of promoter consensus because of Operators Repressors Specificity factors Mediators None Gene I related to lac operon encodes a diffusible product? True False None E. coli can synthesis all essential amino acids True Flase None In trp operon transcription in which of the following condition sequence 2 will pair with sequence 3 At low charged tryptophan tRNA (Trp-tRNATrp) concentration When of ribosomes stall at sequence 1 Sequence 2 is available for pairing All of the above. None Which of the following genes are not required to be governed by the operon Genes of glycolytic pathway Genes of larger protein complex Genes with co-ordinated function Genes essential under specific condition None Time's up
