SCIENCE 1315 Microbiology Test blanks (Chapter 9) | Microbiology, Chloroplast, DNA, DNA Damage | Doenload To Score An A
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Module
SCIENCE 1315
Institution
UNIVERSITY OF TORONTO (U Of T
)
Microbiology test blanks (Chapter 9) Student: 1. Among the microorganisms, various genomes can include: A. chromosomes. B. plasmids. C. mitochondrial DNA. D. chloroplast DNA. E. All of the choices are correct. 2. Eukaryotic chromosomes differ from prokaryotic chromosomes because only eukaryotes hav...
2 eukaryotic chromosomes differ from prokaryotic chromosomes because only eukaryotes have
5 the antiparallel arrangement within dna molecule
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SCIENCE 1315
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Microbiology test blanks (Chapter 9)
Student:
1. Among the microorganisms, various genomes can include:
A. chromosomes.
B. plasmids.
C. mitochondrial DNA.
D. chloroplast DNA.
E. All of the choices are correct.
2. Eukaryotic chromosomes differ from prokaryotic chromosomes because only eukaryotes have
A. histone proteins.
B. chromosomes in a nucleus.
C. several to many chromosomes.
D. elongated, not circular, chromosomes.
E. All of the choices are correct.
3. The DNA of microorganisms is made up of subunits called
A. histones.
B. amino acids.
C. nucleotides.
D. mRNA.
E. polymerases.
4. Which is incorrect about purines?
A. only found in DNA, not in RNA
B. are nitrogenous bases
C. always paired with a specific pyrimidine
D. include adenine and guanine
E. found within nucleotides
5. The antiparallel arrangement within DNA molecules refers to
A. each base bonding at the 1' position of the sugar.
B. a purine always bonding to a pyrimidine.
C. one helix strand that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction.
D. an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA
molecule.
E. None of the choices are correct.
6. Semiconservative replication refers to
A. each base bonding at the 1' position of the sugar.
B. a purine always bonding to a pyrimidine.
C. one helix strand that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction.
D. an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA
molecule.
E. None of the choices are correct.
7. The duplication of a cell's DNA is called
A. mitosis.
B. replication.
C. transcription.
D. translation.
E. mutation.
,8. DNA polymerase III
A. is needed for adding nucleotides during mRNA synthesis.
B. synthesizes new DNA only in the 5' to 3' direction.
C. cannot add nucleotides to the lagging strand.
D. synthesizes an RNA primer.
E. All of the choices are correct.
9. Which enzyme fills in the spaces between the Okazaki fragments with the correct nucleotides?
A. DNA ligases
B. DNA polymerases
C. DNA helicases
D. DNA gyrases
E. primases
10. The enzymes that help pack DNA into the cell by coiling the DNA into a tight bundle are
A. DNA ligases.
B. DNA polymerases.
C. DNA helicases.
D. DNA gyrases.
E. primases.
11. The enzymes that can proofread replicating DNA, detect incorrect bases, excise them, and correctly
replace them are
A. DNA ligases.
B. DNA polymerases.
C. DNA helicases.
D. DNA gyrases.
E. primases.
12. The site where the old DNA strands separate and new DNA strands will be synthesized is called the
A. primer.
B. Okazaki fragment.
C. template.
D. rolling circle.
E. replication fork.
13. All of the following pertain to nitrogenous bases, except:
A. they form pairs by hydrogen bonding.
B. guanine pairs with uracil.
C. adenine pairs with thymine.
D. cytosine and thymine are pyrimidines.
E. allows variation from one nucleotide to another which creates the encoded information.
14. Which enzyme is mismatched with its function in DNA replication?
A. gyrase - supercoiling DNA
B. RNA polymerase - synthesizes RNA primers
C. ligase - final sealing of DNA nicks in DNA
D. DNA polymerase I - removes primer
E. DNA polymerase III - Adding bases to the new DNA chain
15. Groups of three consecutive bases along the DNA of a gene have the code for one
A. protein.
B. nucleotide.
C. amino acid.
D. purine.
E. None of the choices are correct.
, 16. The RNA molecules that carry amino acids to the ribosomes during protein synthesis are called
A. ribosomal RNA.
B. messenger RNA.
C. transfer RNA.
D. primer RNA.
E. ribozymes.
17. This molecule is transcribed from the DNA template strand and later translated.
A. ribosomal RNA
B. messenger RNA
C. transfer RNA
D. primer RNA
E. protein
18. RNA molecules differ from DNA molecules because only RNA
A. has ribose.
B. has uracil.
C. is typically one strand of nucleotides.
D. does not have thymine.
E. All of the choices are correct.
19. All of the following pertain to transcription, except it:
A. occurs on a ribosome in the cytoplasm.
B. occurs before translation.
C. requires RNA polymerase.
D. requires a template DNA strand.
E. is part of the process of protein synthesis.
20. Which of the following is incorrect about transfer RNA?
A. it has a bottom hairpin loop with an anticodon.
B. an anticodon is complementary to a codon.
C. it contains a binding site for an amino acid.
D. the initiator tRNA that binds to the P site has the anticodon UAC.
E. the initiator tRNA in bacteria carries tryptophan.
21. If a codon for alanine is GCA, then the anticodon is
A. GCA.
B. CGT.
C. ACG.
D. CGU.
E. UGC.
22. The non-transcribed region of DNA to which RNA polymerase binds to initiate transcription is called the
A. promoter.
B. operator.
C. operon.
D. exon.
E. intron.
23. A sequence of bases on a gene that does not code for protein is called a/an
A. promoter.
B. operator.
C. operon.
D. exon.
E. intron.
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