Download Exam 2 Practice #5

Supplemental Instruction Biology 212 Exam 2 Practice Test
1. 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
2. Which of the following are the small circular extranuclear DNA molecules found in
bacteria
A. nucleoids
B. nucleosomes
C. pili
D. plasmids
E. chloroplasts
3. 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
4. What molecule complexes removes Introns from mRNA?
A. repairons
B. exons
C. anticodons
D. oncogenes
E. spliceosomes
5. Which of the following statements is always true of a retrovirus?
A. virus living in a host cell B. a very primitive virus
C. has RNA genome
D. has no cell membrane
E. a virus inserted into host DNA
6. 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
7. What element of the operon does a repressor protein attach to?
A. the repressor
B. the structural gene
C. the promoter
D. the activator
E. the operator
8. The Hershey and Chase experiment showed _________ to be the genetic material
A. protein
B. amino acids
C. DNA
D. tRNA
E. mRNA
9. In DNA adenine pairs with:
A. uracil
B. cytosine
D. thymine
10. The steps of protein synthesis in order are:
A. transcription, translation, RNA processing
B. initiation, RNA processing, transcription, translation
C. transcription, RNA processing, translation
D. translation, RNA processing, transcription
C. guanine
11. Protein synthesis occurs on/in a:
A. mitochondria
B. ribosome
D. strand of DNA
E. Nucleus
C. amino acid
12. An Okazaki fragment
A. occurs on the leading strand
B. occurs on the lagging strand
C. is essential to protein synthesis
D. occurs only in RNA
13. All of the following are DNA EXCEPT:
A. Adenine
B. Guanine
D. Thymine
E. Cytosine
C. Uracil
14. ___________ is the enzyme responsible for producing the short RNA sequences used
to initiate DNA replication
A. primase
B. ATP synthase
C. helicase
D. telomerase
E. DNA polymerase
15. A change in the nucleotide sequence of an organism’s DNA that results in the
insertion of a nucleotide base is called a _____________ mutation
A. frameshift
B. silent
C. missense
D. nonsense
E. none of the above
16. Which of the following information transfers is catalyzed by DNA polymerase?
A. RNA  RNA
B. DNA  RNA
C. RNA  DNA
D. DNA  DNA
E. RNA  Protein
17. The anticodon of a particular tRNA molecule is
A. complementary to the corresponding mRNA codon
B. complementary to the corresponding triplet in rRNA
C. part of the tRNA that bonds to a specific type of amino acid
D. Changeable, depending on the amino acid that attaches to the tRNA
E. the “active site” of the tRNA enzyme
18. If a gene contains 900 nucleotides, how many amino acids will be in the protein that
it codes for?
A. 30
B. 300
C. 900
D. 2700
E. could be any number
19. The stability of mRNA in the cytoplasm is dependent on
A. 5’ Guanine cap.
B. 5’ methylation of DNA. C. 3’ polyA tail
D. 5’ acetylation of lysine E. A and C
20. Stage in gene expression that can NOT be regulated.
A. chromatin structure
B. transcription
D. RNA stability
E. none of the above
C. RNA processing
21. The light reactions of photosynthesis supply the Calvin Cycle with
A. photon energy
B. H+ electrochemical gradient energy
C. CO2 and H2O
D. ATP and NADPH
E. sugars and K+
22. Which of the following processes is most directly driven by photon energy?
A. Creation of a pH gradient across the thylakoid membrane.
B. Oxidation of chlorophyll a in the reaction center
C. Reduction of NADP+ in the stroma
D. Production of O2 in the thylakoid space
E. ATP synthesis in the stroma
23. In the light reactions what is the electron donor?
A. chlorophyll P680
B. chlorophyll P700
D. CO2
E. O2
C. H2O
24. In the light reactions what is the ultimate electron acceptor?
A. NADPH
B. NADP+
C. NADH
+
D. NAD
E. ADP
25. Cyclic electron flow is required in a photobacteria because
A. Photobacteria lacks cellular respiration.
B. Photobacteria cannot use NADPH.
C. Photobacteria does not need to reduce NADP+.
D. Photobacteria lacks photosystem II.
E. Photobacteria lacks photosystem I.
26. Which of the following statement is a correct distinction between autotrophs and
heterotrophs?
A. Cellular respiration is unique to heterotrophs.
B. Only heterotrophs have mitochondria.
C. Only heterotrophs require O2.
D. Only heterotrophs require chemical compounds from the environment.
E. Only autotrophs have chloroplasts.
27. 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.