Biology 5090/22 — October/November 2023

Cambridge O-Level · Theory · worked solutions for every part, with the mark scheme

questions

marks

105

minutes

Topics Cell Structure and Organisation · Classification · Organisms and Their Environment · Human Nutrition · Respiration · Inheritance · +13 more

Q116MDisease and ImmunityCell Structure and OrganisationSexual Reproduction in HumansClassificationMovement Into and Out of CellsFree sample

Cholera is caused by a type of organism that can be passed from one host to another.

(a)

State the term used to describe

(i)

a disease-causing organism

______

(ii)

the type of disease in which the disease-causing organism is passed from one host to another.

______

(b)

The disease-causing organism that causes cholera is a bacterium.

Complete Table 1.1 to list some of the structures present in a bacterial cell and the function of each structure.

Table 1.1

structure	function
ribosomes
	small rings of DNA that carry genes
	controls the passage of substances into and out of the cell
cell wall

(c)

Fig. 1.1 shows a photograph of the bacterium that causes cholera.

Fig. 1.1

(i)

The length of the bacterium in the photograph is $100\,\text{mm}$ . Use this value to calculate the actual length of the bacterium in micrometres (µm).

______ $\text{µm}$

(ii)

Use your knowledge of a type of specialised human cell to suggest the name of structure Z and to state its function.

name = ______
function = ______

(iii)

The binomial name of this type of bacterium is Vibrio cholerae.

State the genus of this type of bacterium and one advantage of the binomial system of naming species.

genus = ______
advantage = ______

(iv)

Explain how the presence of bacteria of this type in a human causes diarrhoea, one of the symptoms of cholera.

The rest of this paper

6 more questions

Q2Organisms and Their Environment · Biological Molecules · Human Nutrition · Respiration · Inheritance · Enzymes8M
Q3Transport in Humans · Excretion · Coordination and Control · Human Nutrition12M
Q4Respiration · Human Gas Exchange · Cell Structure and Organisation · Cell Division and Reproduction · Inheritance15M
Q5Biotechnology and Genetic Modification · Enzymes9M
Q6Plant Nutrition · Transport in Flowering Plants10M
Q7Organisms and Their Environment · Classification10M

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