Question

2500 ATALA 2500supoe lengiz noitenido51.8 20 8. A gene contains two 2,500 bp introns and three 1,000 bp exons. How long is the mature RNA transcribed from this gene, not considering modifications to the 5' or 3' end?islynobavlog A. 5,000 nt B. 3,000 nt C. 8,000 nt Sllo que 2 B 2 Jor D. 7,000 nt АИЯo bo'z otli no airongirls-A E. Impossible to tell from the information given of bobbinabinonizonobe to Soup ! AVSI od to bio Cortos bobbslinul lor A or lo n o no noglom-2.0 9. Which of the following occupy the smallest relative proportion of DNA in the human genome? A. retrovirus-like sequences B. long interspersed elements C. exons on bisognon 2020TIVO191 101 on i ovo monold W. D. introns i tot oogmolqmoo Ano bang MAS A E. genes AST or mollib AA 0.8 SA 10. Protein X is found to bind to a certain gene's promoter only when substance A is not present The gene can be transcribed in the presence of both X and A. It is not transcribed in the presence of X alone. Protein X is a(n) Substance A is a(n) A. repressor; effector otlu sagabald ning of oub mo o nos B. repressor; repressornia ogniool voor onbo n C. activator; effector co n tigeni and now D. activator; repressor b od E. activator; activator mo g na indoor

numbers 8 and 10

Answer 1

Solution

que 8- correct option is B. Because mature RNA is formed from splicing of introns and joining of all exons.if all introns are spliced out then only 3 exons of 1000 nt long=3000 nt long mature RNA will form.so other option are incorrect.

que 10-correct option is A.beacuse X is found to bind at promoter region when there is no sustance A.means X is the repressor protien that can bind to promoter.if A is present then X can not bind to promoter because X and A bind to each other.and transcription starts.due to transcription of gene some enzyme forned which breacks the substance A. So concentration of A will decreases.so at that time X can bind to promoter region to stop operon.after some time substance A is absorbed and increased in cell.which again binds to X and operon start there transcription.

so protein X is called as repressor protein while substance A is called as effector molecule like inducer.