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Biology Unit 5 > How science works > Flashcards

Flashcards in How science works Deck (7)
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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;