DP Biology (last assessment 2024)

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Question 19N.2.HL.TZ0.1a

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.2.HL.TZ0.1a
Level HL Paper 2 Time zone TZ0
Command term State Question number a Adapted from N/A
a.
[Maximum mark: 1]
19N.2.HL.TZ0.1a

The black-legged tick (Ixodes scapularis) is an arthropod which sucks blood from humans and other mammals. It is encountered mainly in wooded and semi-wooded areas. Some ticks can be infected by the bacterium Borrelia burgdorferi. When a tick bites a human, the bacterium is often introduced, causing Lyme disease. Lyme disease is a public health problem in North America and, if left untreated, can cause important neurological impairment. The diagram represents the two-year life cycle of a tick.

[Source: Cary Institute of Ecosystem Studies / Leslie Tumblety]

(a)

State the domain into which ticks are classified.

[1]

Markscheme

eukaryote ✔

Accept eukaryotes.

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