Edexcel A-Level Biology A2 6.5 Bacteria Viruses Lytic Cycle and Latency Questions

Compare bacterial and viral structures, explain lytic replication and host entry, and apply phage or oncolytic virus evidence to biological problems.

Exam points

describe viral genomes, envelopes, capsids and host-cell attachment or specificity
explain viral replication, lytic cycles, lysins and phage-driven changes in bacterial populations
apply bacteria-and-virus knowledge to phage therapy, oncolytic virotherapy and viral protein functions

[Maximum number: 3]

Rabies is a disease caused by a virus.

(a)

The diagram shows the structure of the rabies virus.

Figure for Question (a) — Edexcel A-Level Biology A2

[ 3 ]

(i)

The rabies virus has an envelope.

Which of the following pairs of viruses have an envelope?

Ebola virus and human immunodeficiency virus (HIV)

human immunodeficiency virus (HIV) and tobacco mosaic virus (TMV)

lambda phage ( $\lambda$ phage) and Ebola virus

tobacco mosaic virus (TMV) and lambda phage ( $\lambda$ phage)

[ 1 ]

(ii)

The structure of the rabies capsid is described as complex.

Which of the following has a complex capsid structure?

Ebola virus

human immunodeficiency virus (HIV)

lambda phage ( $\lambda$ phage)

tobacco mosaic virus (TMV)

[ 1 ]

(iii)

Rabies virus is an RNA virus.

How many of the following viruses are RNA viruses?
- Ebola virus
- human immunodeficiency virus (HIV)
- lambda phage ( $\lambda$ phage)
- tobacco mosaic virus (TMV)

[ 1 ]

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Edexcel A-Level Biology A2 6.5 Bacteria Viruses Lytic Cycle and Latency Questions question 1

Question (a)

Question (i)

Question (ii)

Question (iii)