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Date November 2019 Marks available 2 Reference code 19N.2.SL.TZ0.3
Level Standard level Paper Paper 2 Time zone TZ0 / no time zone
Command term State Question number 3 Adapted from N/A

Question

Outline the cell theory.

[2]
a.

State two functions of life.

[2]
b.

List three characteristics of eukaryotic homologous chromosomes.

[3]
c.

Using the following table, compare and contrast anaerobic cell respiration in yeasts and in humans. The first row has been completed as an example.

[3]
d.

Markscheme

a. cells can only arise from preexisting cells ✔

b. living organisms are composed of cells/smallest unit of life ✔

c. organisms consisting of only one cell carry out all functions of life in that cell/cells perform life functions «at some point in their existence» ✔

d. although most organisms conform to cell theory, there are exceptions ✔

a.

a. nutrition ✔

b. metabolism/respiration ✔

c. growth ✔

d. response/irritability ✔

e. excretion ✔

f. homeostasis ✔

g. reproduction ✔

Do not allow “feeding”, plants do not “feed”.

Mark the first two answers only.

b.

a. linear DNA molecules
OR
DNA associated with histone «proteins» ✔

b. carry the same sequence of genes

c. «but» not necessarily the same alleles «of those genes» ✔

d. both are present when nucleus is in diploid state ✔
OR
occur in pairs ✔

e. have same size/length/banding patterns ✔

f. centromeres are in the same position ✔

c.

Award [1] per correct row.

d.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.
[N/A]
d.

Syllabus sections

Core » Topic 1: Cell biology » 1.1 Introduction to cells
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Core » Topic 1: Cell biology
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