Study Questions

1. Scientist have discovered how to put together a bacteriophage with the protein coat of phage T2 and the DNA of phage T4. If this composite phage were allowed to infect a bacterium, the phages produced in the host cell would have
1. The protein of T2 and the DNA of T4
2. The protein of T4 and the DNA of T2
3. A moisture of the DNA and proteins of both phages
4. The protein and DNA of T2
5. The protein and DNA of T4
2. Horizontal transmission of a plant viral disease could be caused by
1. The movement of viral particles through plasmodesmata
2. The inheritance of an infection from a parent plant
3. The spread of an infection by vegetative propagation
4. Insects as vectors carrying virus particles between plants
5. The transmission of proviruses via cell division
3. RNA viruses require their own supply of certain enzymes because
1. The viruses are rapidly destroyed by host cell defenses
2. Host cells of not have enzymes available that can replicate the viral genome
3. The enzymes translate viral mRNA into proteins
4. The viruses use these enzymes to penetrate host cell membranes
5. These enzymes cannot be made in host cells
4. Which of the following is descriptive of an R plasmid?
1. Its transfer converts an F^-  cell into a F⁺ cell
2. It contains genes for antibiotic resistance and for sex pili
3. It is usually transferred between bacteria by transduction
4. It is a good example of a composite transposon
5. It makes bacteria resistant to phage
5. A particular operon encodes enzymes that together manufacture an essential amino acid. If the regulation of this operon is like that of the trp operon,
1. The amino acid inactivates the repressor
2. The enzymes produced are called inducible enzymes
3. The repressor binds to the operator in the absence of the amino acid
4. The amino acid acts as corepressor
5. The amino acid turns on enzyme synthesis
6. Which of the following information transfers is catalyzed by reverse transcriptase?
1. RNA à RNA
2. DNAàRNA
3. RNAà DNA
4. ProteinàDNA
5. RNAàprotein
7. Which of the following characteristics or processes is common to both bacteria and viruses?
1. Nucleic acid as the genetic material
2. Binary fission
3. Mitosis
4. Ribosomes in the cytoplasm
5. conjugation
8. Which of the following processes would never contribute to genetic variation within a bacterial population?
1. Transduction
2. Transformation
3. Conjugation
4. Mutation
5. Meiosis