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 | Outline | Question number | 3 | Adapted from | N/A |
Question
Outline the cell theory.
State two functions of life.
List three characteristics of eukaryotic homologous chromosomes.
Using the following table, compare and contrast anaerobic cell respiration in yeasts and in humans. The first row has been completed as an example.
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. 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.
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 ✔
Award [1] per correct row.