Chapter 18 Review Page 1

Transcription

1 hapter 18 Review Page 1 1 In this diagram of a virus, the pointer is indicating the virus's capsid. genome. envelope. mitochondria. microfilaments. 2 Viral N makes mrn by the process of lysis. infection. replication. translation. transcription. 3 The lytic cycle of bacteriophage infection ends with the replication of viral N. rupture of the bacterium. assembly of viral particles into phages. the injection of phage N into a bacterium. entry of the phage protein coat into the host cell. 4 In this diagram of a T4 bacteriophage, the pointer is indicating the viral envelope. viral protein coat. viral nucleic acid genome. bacterium's plasma membrane. bacterium's nucleic acid genome.

2 hapter 18 Review Page 2 5 s a result of the lytic cycle, a prophage is created. the host cell is not destroyed. viral ribosomes are produced. the host cell's N is destroyed. viral N is incorporated into host cell N. 6 In this animation, the arrow is indicating a capsid. a prophage. an envelope. host cell N. a Golgi apparatus. 7 This animation is illustrating an early stage of lysis. translation. transcription. the lytic cycle. the lysogenic cycle. 8 In the lysogenic cycle viral N is replicated along with host N. host N is destroyed and viral N is replicated. viral N is destroyed and host N is replicated. a bacterium divides once before the lytic cycle is initiated. a bacterium replicates without passing viral N to its daughter cells. 9 Which of these is the best description of this animation? The lysogenic cycle has begun. The host cell has begun to reproduce. The lysogenic cycle is making a transition to the lytic cycle. The lytic cycle is making a transition to the lysogenic cycle. The bacterium has successfully fought off the viral infection.

3 hapter 18 Review Page 3 10 ycle is the cycle and cycle is the cycle. lytic... phage lytic... lysogenic lysogenic... lytic lysogenic... phage phage... lysogenic 11 The genetic material of HIV consists of single-stranded RN. single-stranded N. double-stranded RN. double-stranded N. none of the above 12 Which of these binds to receptor molecules on the host cell membrane? 13 What is the function of reverse transcriptase? It catalyzes the formation of RN from a N template. It catalyzes the formation of N from an RN template. It catalyzes the formation of RN from a polypeptide template. It catalyzes the formation of N from a polypeptide template. It catalyzes the formation of a polypeptide from an RN template.

4 hapter 18 Review Page 4 14 What is the source of a viral envelope? provirus prophages host cell N viral glycoproteins host cell membrane 15 Which of these is reverse transcriptase? 16 Which of these is the viral genome? 17 What enzyme is responsible for the process shown in this animation? N ligase endonuclease RN polymerase N polymerase reverse transcriptase

5 hapter 18 Review Page 5 18 When HIV reproduces, reverse transcriptase catalyzes the synthesis of a N strand complementary to the viral RN strand and then a second N strand complementary to the first. fter this, the double-stranded viral N is incorporated into a host cell as a lac. provirus. promoter. transposon. homeoboxes. 19 The operon model of the regulation of gene expression in bacteria was originally proposed by arwin. Mendel. Franklin. Jacob and Monod. Watson and rick. 20 Which of these is NOT a component of the lac operon? operator only promoter only regulatory gene only promoter and operator lactose-utilization genes only 21 In a bacterial operon, regulatory proteins bind to the operator. RN polymerase. the regulatory gene. transcription factors. the lactose-utilization genes. 22 In the presence of a regulatory protein, the lac operon is transcribed. is turned on. only transcribed at the basal level. either transcribed or not transcribed. transcribed at a faster than usual rate. 23 In this animation the blue sphere represents mrn. lactose. RN polymerase. an active repressor. an inactive repressor.

6 hapter 18 Review Page 6 24 In this animation the orange object represents mrn. lactose. RN polymerase. an active repressor. an inactive repressor. 25 Which of these is a regulatory gene?

7 hapter 18 Review Page 7 nswer Key : hapter 18 Review Question: nswer