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Practice Test

front 1 Griffith's experiments with S. pneumoniae were significant because they showed that traits could be transferred from one organism to another. What else did he find that was significant? Heat kills bacteria. A virus made the bacteria pathogenic. Protein could not be the genetic material. The transferred traits were heritable. DNA was the genetic material.	back 1 Heat kills bacteria. A virus made the bacteria pathogenic. Protein could not be the genetic material. The transferred traits were heritable. DNA was the genetic material.
front 2 In the Hershey and Chase experiment that helped confirm that DNA, not protein, was the hereditary material, what was the key finding? Radioactively labeled sulfur was present inside the infected bacteria. Radioactively labeled phosphorus was found outside of the infected bacteria. Radioactively labeled carbon was present inside the infected bacteria. Radioactively labeled sulfur was found outside of the infected bacteria. Radioactively labeled phosphorus was present inside the infected bacteria.	back 2 Radioactively labeled sulfur was present inside the infected bacteria. Radioactively labeled phosphorus was found outside of the infected bacteria. Radioactively labeled carbon was present inside the infected bacteria. Radioactively labeled sulfur was found outside of the infected bacteria. Radioactively labeled phosphorus was present inside the infected bacteria.
front 3 In his transformation experiments, what phenomenon did Griffith observe? Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain makes the pathogenic strain nonpathogenic. Infecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic strains. Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form. Mice infected with a pathogenic strain of bacteria can spread the infection to other mice.	back 3 Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain makes the pathogenic strain nonpathogenic. Infecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic strains. Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form. Mice infected with a pathogenic strain of bacteria can spread the infection to other mice.
front 4 Which of the following statements describes the process of transformation in bacteria? A strand of DNA is created from an RNA molecule. Bacterial cells are infected by a phage DNA molecule. External DNA is taken into a cell, becoming part of the cell's genome. A strand of RNA is created from a DNA molecule.	back 4 A strand of DNA is created from an RNA molecule. Bacterial cells are infected by a phage DNA molecule. External DNA is taken into a cell, becoming part of the cell's genome. A strand of RNA is created from a DNA molecule.

front 5 It became apparent to Watson and Crick after completion of their model that the DNA molecule could carry a vast amount of hereditary information. Which of the following characteristics of DNA is responsible for this? side groups of nitrogenous bases sequence of bases complementary pairing of bases phosphate-sugar backbones	back 5 side groups of nitrogenous bases sequence of bases complementary pairing of bases phosphate-sugar backbones
front 6 In the polymerization of DNA, a phosphodiester bond is formed between a phosphate group of the nucleotide being added and which of the following atoms or molecules of the last nucleotide in the polymer? the 3' OH the 5' phosphate a nitrogen from the nitrogen-containing base C6	back 6 the 3' OH the 5' phosphate a nitrogen from the nitrogen-containing base C6
front 7 The first step in the replication of DNA is catalyzed by _____.	back 7 Helicase
front 8 Why is the new DNA strand complementary to the 3' to 5' strands assembled in short segments? DNA polymerase can assemble DNA only in the 5' to 3' direction. Since DNA polymerase can assemble DNA only in the 5' to 3' direction, the new strand complementary to the 3' to 5' strand must be assembled either in short 5' to 3' segments, which are later joined together by ligase, or be assembled continuously.	back 8 DNA polymerase can assemble DNA only in the 5' to 3' direction. Since DNA polymerase can assemble DNA only in the 5' to 3' direction, the new strand complementary to the 3' to 5' strand must be assembled either in short 5' to 3' segments, which are later joined together by ligase, or be assembled continuously.

front 9 What materials does DNA polymerase require in order to synthesize a complete strand of DNA? 3'-OH end of the new DNA strand All four deoxyribonucleotides triphosphates (containing A, C, T, or G) ATP Single-stranded DNA template Inorganic phosphate	back 9 3'-OH end of the new DNA strand All four deoxyribonucleotides triphosphates (containing A, C, T, or G) ATP Single-stranded DNA template Inorganic phosphate
front 10 Nucleotide excision repair	back 10 a section of DNA containing the damage is removed, and the gap is then filled in and completed by DNA polymerase and DNA ligase.
front 11 In E. coli, which enzyme catalyzes the elongation of a new DNA strand in the 5' → 3' direction? In E. coli, which enzyme catalyzes the elongation of a new DNA strand in the 5' → 3' direction? DNA ligase helicase DNA polymerase III primase	back 11 In E. coli, which enzyme catalyzes the elongation of a new DNA strand in the 5' → 3' direction? DNA ligase helicase DNA polymerase III primase
front 12 What is the function of DNA polymerase III?	back 12 To add nucleotides to the 3' end of a growing DNA strand

front 13 A white-eyed female Drosophila is crossed with a red-eyed male Drosophila. Which statement below correctly describes the results?	back 13 None of the females will have white eyes.
front 14 Which of the following statements correctly describes the meaning of the chromosome theory of inheritance as expressed in the early 20th century?	back 14 Mendelian genes are at specific loci on the chromosome and, in turn, segregate during meiosis.
front 15 In cats, black fur color is determined by an X-linked allele; the other allele at this locus determines orange color. The heterozygote is tortoiseshell. What kinds of offspring would you expect from the cross of a black female and an orange male? orange females; black males tortoiseshell females; tortoiseshell males black females; orange males tortoiseshell females; black males	back 15 orange females; black males tortoiseshell females; tortoiseshell males black females; orange males tortoiseshell females; black males
front 16 Which of the following statements regarding gene linkage is correct?	back 16 The closer two genes are on a chromosome, the lower the probability that a crossover will occur between them.

front 17

What does a recombination frequency of 50% indicate?What does a recombination frequency of 50% indicate?

back 17

The two genes are likely to be located on different chromosomes.