Question 19N.2.SL.TZ0.3
| Date | November 2019 | Marks available | [Maximum mark: 10] | Reference code | 19N.2.SL.TZ0.3 |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Compare and contrast, List, Outline, State | Question number | 3 | Adapted from | N/A |
Outline the cell theory.
[2]
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 ✔
State two functions of life.
[2]
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.
List three characteristics of eukaryotic homologous chromosomes.
[3]
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 ✔
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]
Award [1] per correct row.
