27. If a bacteria is placed in an environment that contains both glucose and lactose, the regulation of the lac operon will allow which nutrient to be processed first?
(A) glucose
(B) lactose
(C)Both will be processed equally
(D) Neither will be processed in this environment

23. An R loop experiment was performed on two different mRNA's. The first showed one R loop, while the second showed two R loops separated by a region of double-stranded DNA. What is the composition of these two mRNA's? (A) The first contains no introns and the second two introns (B) The first contains no introns and the second one intron (C)The first contains one intron and the second two introns (D) The first contains two introns and the second one intron

24. What enables the splicing of group I and II introns? (A) spliceosomes (B) ribozymes (C)snRNA (D) poly-A tail

25. Where does mRNA/tRNA codon-anticodon recognition take place? (A) 30S (B) 40S (C)50S (D) the surface between the two ribosomal subunits

26. With regard to Chapeville's experiment, what could not be the radioactive element used to label cysteine? (A) 15N (B) 35S (C)C (D) H

28. The regulation of protein function, not gene expression, is called _____ regulation. (A) posttranslational (B) transcriptional (C)translational (D) post-transcriptional

29. Translational regulatory proteins recognize specific areas of what molecule? (A) tRNA (B) ribosome (C)rRNA (D) mRNA

複選題30. Histone acetyltransferases would be directly involved in which of the following? (A) formation of open chromatin (B) movement of the nucleosome (C)acetylation of lysines (D) termination of gene expression

31. CpG islands are associated with which of the following? (A) nucleosome location (B) DNA methylation (C)steroid hormone activity (D) cAMP pathway

32. Genomic imprinting is a result of _____(A) nucleosome location (B) histone activation (C)DNA methylation (D) serine to leucine changes in the genetic code

33. As a researcher you have identified a potential transposable element that contains both a transposase and resolvase enzyme. Which of the following types of transposons would you assign it to based on this information? (A) composite transposon (B) non-viral retroelement (C)viral-like retroelement (D) replicative transposon