Gene Expression

Study Questions

 

1.         Why is it beneficial for organisms to be able control gene expression?

2.         What is an operon?

3.         How does lactose function with the lac operon?

4.         Describe the structure of the prokaryote operon?

5.         What turns off the lac operon?

6.         What is the purpose of the promotor region of the operon?

7.         What is the purpose of the operator region of the operon?

8.         What is a repressor?

9.         What is the purpose of the regulator gene?

10.       Summarize the function of the lac operon.

11.       How can the intron-exon pattern of gene organization serve as a source of diversity?

12.       Distinguish between mRNA and pre-mRNA.

13.       What is morphogenesis?

14.       How is morphogenesis affected by the control of gene expression?

15.       What part of the chromosomes are found in each cell of an Eukaryote?

16.       What are introns and exons?

17.       What is the function of enhancers?

18.       What is euchromatin?

19.       Summarize the transcription process in eukaryotes?

20.       At what part of transcription process are the introns removed?

21.       How does cell differentiation differ from morphogenesis?

22.              What is the role of homeotic genes?

23.              What determines the body axis?

24.              What determines the location of the head?

25.              What genes control the sequence of body parts

26.              What is the purpose of the master genes?

27.       What is a homeobox gene?

28.       What developmental patterns are affected by homeobox genes?

29.       What is the difference between master control and homeobox genes?

30.       What did Saint-Hilaire propose about the body plans of vertebrates and insects? How is this supported by homeobox genes?

31.       What does the study of homeobox genes suggest about relationships amongst eukaryote organisms?

32.       A molecular biologist takes samples of mRNA from brain cells and from liver cells. He finds they are different. Can these results be correct? Explain your answer.

33.       What determines the part of a DNA molecule that is transcribed in a eukaryote?

34.       How do sex chromosome result is equal numbers of male and female offspring?

35.       What are point mutations?

36.       What is a substitution mutation?

37.       What is a frame shift mutation?

38.       What is the difference in affect of a substitution mutation and the affect of a frame shift mutation?

39.       How does a chromosome mutation differ from a gene mutation?

40.       What happens in a deletion mutation?

41.       What happens in an inversion mutation?

42.       What happens in a translation mutation?

43.       What is a non-disjunction?

44.       What is a mutation?

45.       How do somatic and germ cell mutations differ?

46.       How do sex chromosomes differ from autosomes?

47.       What is sex linkage?

48.       What is a mutagen?