1. Problem Solving  Answers
1. How many cells under the microscope?
2. What is the average length of each cell?
3. How many cells under the microscope?
4. What is the average length of each cell? 6 9
300 units
180 units
300 / 6 = 50 units
180 / 6 = 30 units
5. What type of cells are shown above?
6. Name 3 parts NOT shown in the cell above, but would be found in a plant cell
7. The above cells underwent cell division and make 2 new cells every 30 minutes. How many new cells would be made after a) 2 hours and b) 3 hours?
Animal cells
Chloroplasts, cell wall and vacuole
16 cells
64 cells

2. Problem Solving  Answers
Person
Age (years)
DNA Sample given?
Type of DNA sample
Jane 46
Yes
Saliva
Steve 38
Blood
Natasha 36 No /
Which person provided a blood DNA sample?
Calculate the average age of the people in table
DNA profiling has many uses.
Which person from the table would be involved in paternity testing?
Why is paternity testing carried out?
Why could the police not rule out Natasha as a suspect in a crime during a forensics investigation?
Name another use of DNA profiling
Where are a) DNA b) genes and c) chromosomes found?
What is the function of DNA?
Why is DNA used in DNA profiling?
Steve
= 120
120 / 3 = 40 years old
Steve
To identify who the father is
She did not give a DNA sample
Assessing future health risks
All are found in the nucleus
To carry instructions to make proteins
DNA is unique to each person

3. Problem Solving  AnswersC D
A = bacterium B = yeast C = yeast D = bacterium
Identify each type of cell above
Name 2 useful products that can be made by cells A and D
Name 3 useful products that can be made by cells B and C
Name 2 chemicals that can be used to decrease the growth of cells A and D
Why properties do micro-organisms like the ones above have that make them useful in different industries?
Cheese, yoghurt
Wine, beer, bread
Antibiotics AND disinfectants / bleach / antibacterial cleaners
1. They grow rapidly and 2. they have a diverse use of food sources

4. Problem Solving  Answers
1. How much sugar is produced when the plant is 12 days old?
2. How old is the plant when it makes 16g of sugar?
For Qs 3 and 4, choose from INCREASE, DECREASE or STAY THE SAME as your answer.
3. Predict what you think will happen to the units of sugar produced on day 30.
4. State what will happen to the units of sugar produced if the plant no longer received light.
4 g
18 days old
Units of sugar produced (g)
It will increase
Age of plant (days)
It will decrease