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Unit 2
Supplemental Instruction
Iowa State University
Landon
Biology 212 (2)
Dr. Mayfield
2/20/11
1. Non-coding sequences of DNA can be defined as:
a. exons
b. operons
c. introns
d. both a and b
2. Solar energy is used to split _________ to produce oxygen
a. electrons
b. water
c. carbon dioxide
d. b and c
e. none of the above
3. Which of the following is NOT an input of the calvin cycle?
a. carbon dioxide
b. ATP
c. NADH
d. G3P
e. c and d
4. Cyclic flow of electrons does NOT use which of the following?
a. photosystem I
b. photosystem II
c. 700 nm light
d. uneven amounts of ATP and NADPH
e. none of the above
5. __________ proved viruses do NOT transfer genetic material through proteins.
a. Frederick Griffeth
b. Watson and Crick
c. T.H Morgan
d. Hershey Chase
e. none of the above
6. Which of the following enzymes mends the fragments of the lagging strand together in DNA transcription?
a. helacase
b. DNA polymerase III
c. ligase
d. primase
7. A mutation that stops translation early is called
a. missense change
b. frame shift
c. silent change
d. nonsense change
e. none of the above
Supplemental Instruction
1060 Hixson-Lied Student Success Center  294-6624  www.si.iastate.edu
8. The chloroplast requires a third membrane compartment to
a. contain the high H+ concentration created during photosynthesis.
b. store the O2 produced during photosynthesis for cellular respiration.
c. separate PSII and PSI.
d. separate non-cyclic and cyclic electron flow during photosynthesis.
e. store water for photosynthesis.
9. ____________ cycle results in bacteriophage reproduction and death of the cell host
10. Which of the following must be present for conjugation of bacteria
a. F plasmid
b. mRNA
c. transcription
d. gametes
11. What is not true of an operon?
a. usually present in prokaryotes
b. regulates gene expression rates
c. usually present in eukaryotes
d. use RNA polymerase to start
e. none of the above
12. What is the basis for the difference in how the leading and lagging strands of DNA replication?
a. polymerase can only work on one strand at a time
b. the origins of the replication are only at the 5’ end
c. helicase damages the replication fork
d. polymerase can only add nucleotides to the 3’ end
e. a and d are true
13. Genetic code is:
a. overlapping
b. unique
c. redundant
d. alternating
e. non-conserved
14. Photorespiration
a. is a problem in C4 and CAM plants
b. increases as temp increases and carbon dioxide concentrations decreases
c. occurs when plant oxygen levels are insufficient
d. provides oxygen as the ultimate electron acceptor
e. enhances carbon dioxide binding to RuBp
15. Photon energy is transferred between photopigments in the light harvesting complex
a. with increasing energy
b. with decreasing wavelength between photopigments
c. with increasing wavelength between photopigments
d. without any change in wavelength
e. with photopigment fluorescence
16. Stage in gene expression that can NOT be regulated.
a. chromatin structure
b. transcription
c. RNA processing
d. RNA stability
e. none of the above
17. What is not different between prokaryote and eukaryote transcription
a. the number of RNA polymerases
b. use of uracil nucleotides in place of thymine nucleotides
c. separation of transcription and translation
d. simultaneous polysomes during transcription
e. RNA peocessing
18. Combinatorial regulation of gene expression allows:
a. regulation of many genes by combinations of a few specific transcription factors.
b. regulation of many genes by combinations of large specific transcription factors.
c. regulation of individual genes by combination with individual factors.
d. regulation of individual genes by combination with other genes
e. regulation of individual genes by combination with general factors
19. What is(are) function(s) of DNA Polymerase III?
a. covalent addition of the deoxy-nucleotides to 3’ end of a new DNA strand
b. covalent addition of the deoxy-nucleotides to 5’ end of a new DNA strand
c. proofreading of each added nucleotide for correct base pairing
d. a and c
e. all of the above
20. Which component is not directly involved in eukaryote transcription?
a. DNA
b. transcription factors
c. DNA polymerase
d. RNA polymerase
e. ribose nucleotide
21. What enzyme found in retroviruses allows them to use RNA instead of DNA as genetic material?
A. DNA transcriptase
B. DNA synthase
C. polymerase
D. reverse transcriptase
E. Primase
22. Which of the following is responsible for cutting sugar phosphate backbones?
A. Spliceosome
B. DNA restrictase
C. Restriction enzymes
D. DNA phosphatase
E. None of the above
23. How can an environmental signal (molecule) turn on gene transcription in a bacterial operon?
A. it blocks the promoter
B. it activates the repressor
C. it inactivates the repressor
D. it activates the operator
E. in inactivates the oppressor
24. What molecule complexes removes Introns from mRNA?
A. repairons
B. exons
D. oncogenes
E. spliceosomes
C. anticodons
25. Which of the following statements is always true of a retrovirus?
A. virus living in a host cell
B. a very primitive virus
D. has no cell membrane
E. a virus inserted into host DNA
C. has RNA genome
26. In a bacterial operon system, what unit does RNA polymerase enzyme attach to?
A. the operator
B. the promoter
C. the regulator
D. the exon
E. the repressor
27. What element of the operon does a repressor protein attach to?
A. the repressor
B. the structural gene
D. the activator
E. the operator
C. the promoter
Essay Questions
In photosynthesis, excited state (high energy) electrons are produced by light being absorbed by pigments.
The energy contained in these electrons is used by the cell for two immediate purposes and various longer
term purposes. Explain how the energy of light is channeled to do useful chemical work in plant cells.
Describe and explain the Hershey-Chase experiment. Why does it provide convincing evidence that DNA is the
genetic material in bacteriophage?
Explain what a transcription factor is, what it does, and how repressors regulate gene expression in bacteria