How science works Flashcards
1
Q
Why is it better to show standard deviations instead of range of values
A
-SD shows variation around the mean whereas range just shows highest and lowest -SD less affected by extreme values;
2
Q
Importance of scientists reporting failed attempts
A
- Saves time and money for other scientists
- Same errors aren’t made
3
Q
Important thing to be careful of when sampling
A
- Random to avoid bias
- Large sample size to make data representative
4
Q
How could you use an optical microscope and a slide of muscle tissues to neasure the diameter of a muscle tissue
A
- Measure with eyepiece scale;
- Calibrate against something of known size:
5
Q
Conditions needed for fermenter to grow bacteria
A
- sterile conditions;
- Nutrient medium;
- Suitable pH/temperature/aeration;
6
Q
Why use mice in experiments?
A
- Easy to manage as they can be kept safely in small space;
- Physiology similar to humans so can be used to predict human behaviour;
- Genome of mice well known;
7
Q
Why do tails (external) have lower temperatures than inside?
A
- Heat lost from tail;
- By radiation;
