Edexcel IAL Biology 6.5 Bacteria, viruses and latency

Name the nucleic acid, capsid or envelope feature, link envelope proteins to specific host receptors and distinguish immediate lysis from latent persistence.

Exam points

Compare named viruses by nucleic acid, capsid structure and envelope presence.
Explain viral attachment through complementary envelope proteins and host receptors.
Distinguish lytic replication from latency by the timing of replication and cell lysis.

[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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6.5—Bacteria, viruses, lytic cycle and latency question 1

Question (a)

Question (i)

Question (ii)

Question (iii)