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10 Cards in this Set
- Front
- Back
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Match the molecule indicated by the letters on the diagram with the type of molecule it represents.
A. Protein B. Lipid C. DNA D. Carbohydrate E. m-RNA |
See diagram in powerpoint
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A gene is best defined as
A) A segment of DNA. B) Three nucleotides that code for an amino acid. C) A sequence of nucleotides in DNA that codes for a functional product. D) A sequence of nucleotides in RNA that codes for a functional product. E) A transcribed unit of DNA. |
C) A sequence of nucleotides in DNA that codes for a functional product.
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Which of the following pairs is mismatched?
A) DNA polymerase - makes a molecule of DNA from a DNA template B) RNA polymerase - makes a molecule of RNA from an DNA template C) DNA ligase - joins segments of DNA D) Transposase - cuts DNA leaving sticky ends E) DNA gyrase - coils and twists DNA |
E) DNA gyrase - coils and twists DNA
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Which of the following statements is false?
A) DNA polymerase joins nucleotides in one direction only. B) The leading strand of DNA is made continuously. C) The lagging strand of DNA is started by an RNA primer. D) DNA replication proceeds in one direction around the bacterial chromosome. E) Multiple replication forks are possible on a bacterial chromosome. |
D) DNA replication proceeds in one direction around the bacterial chromosome.
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Which of the following is not a product of transcription?
A) A new strand of DNA B) rRNA C) tRNA D) mRNA E) None of the above |
A) A new strand of DNA
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The initial effect of ionizing radiation on a cell is that it causes
A) DNA to break. B) Bonding between adjacent thymines. C) Base substitutions. D) The formation of highly reactive ions. E) The cells to get hot. |
D) The formation of highly reactive ions.
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According to the operon model, for the synthesis of an inducible enzyme to occur, the
A) End-product must not be in excess. B) Substrate must bind to the enzyme. C) Substrate must bind to the repressor. D) Repressor must bind to the operator. E) Repressor must not be synthesized. |
A) End-product must not be in excess.
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The mechanism by which the presence of glucose inhibits the lactose operon.
A) Catabolite repression B) Translation C) DNA polymerase D) Repression E) Induction |
A) Catabolite repression
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An enzyme that copies DNA to make a molecule of RNA is
A) RNA polymerase. B) DNA ligase. C) DNA ligase. D) Transposase. E) DNA polymerase. |
A) RNA polymerase.
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The lac operon
A) Produces repressible enzymes. B) Produces constitutive enzymes. C) Produces inducible enzymes. D) None of the above. E) |
C) Produces inducible enzymes.
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