BIOLOGY 1201 Practice Final 2019
Fill out SIDE TWO of the scantron, putting your LAST NAME FIRST, your LSU ID number,
and filling-in the appropriate bubbles. Answer the questions using SIDE 1, starting with number
1. The first 50 questions are worth 2 points each and refer to Chapters 11, 18, 19, 39, 45, and 48.
Questions 51-100 are worth 1 point each and refer to chapters we studied earlier in the semester.
Chapter 18
1) Liver cells and brain cells in one species of animal owe their differences in structure and
function to
A) having different genes.
B) having different chromosomes.
C) using different genetic codes.
*D) using different genes.
E) using unique ribosomes.
2) What does the operon model attempt to explain?
3) *A) the coordinated control of gene expression in bacteria
4) B) bacterial resistance to antibiotics
5) C) how genes move between homologous regions of DNA
6) D) the mechanism of viral attachment to a host cell
7) E) horizontal transmission of plant viruses
8)
9) The role of a metabolite like the amino acid Tryptophan (Trp), which controls a
repressible operon like the Trp operon, is to
10) A) bind to the promoter region and decrease the affinity of RNA polymerase for the
promoter.
11) B) bind to the operator region and block the attachment of RNA polymerase to the
promoter.
12) C) increase the production of inactive repressor proteins.
13) D) bind to the repressor protein and inactivate it.
14) *E) bind to the repressor protein and activate it.
15)
16) Transcription of the structural genes in an inducible operon, like the lac operon,
17) A) occurs all the time.
18) *B) starts when the pathway's substrate is present.
19) C) starts when the pathway's product is present.
20) D) stops when the pathway's product is present.
21) E) does not produce enzymes.
22)
23) How does active CRP (cyclic AMP receptor protein) influence the expression of the
genes of the lactose operon?
24) A) It terminates production of repressor molecules.
25) B) It degrades the substrate allolactose.
26) C) It stimulates splicing of the encoded genes.
27) *D) It stimulates the binding of RNA polymerase to the promoter.
28) E) It binds steroid hormones and controls translation.
29)
30) Histones play a role in gene expression by
A) Helping to activate transcription
B) Methylating DNA
C) Binding DNA*
D) Conserving DNA
