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Ocr Biology ­ B4, B5, B6

OCR Biology ­ B4, B5, B6
You will have already done B1, B2 and B3. These units are really just a follow up from the first
ones so make sure you have a quick read over the notes from last year to make sure…

Page 2

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Ocr Biology ­ B4, B5, B6

Controlling body temperature

Our body temperature needs to be kept at about 37°c
There are several ways our body does this.
If we get too hot...
o Receptors in the brain detect temperature
o The information is sent to the processing centre in the…

Page 3

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Ocr Biology ­ B4, B5, B6

If the temperature is too cold the molecules don't have enough energy to collide
successfully. Even with the enzyme the reaction doesn't happen.
If the temperature is too hot the active site becomes denatured this means the
substrate no longer fits into the active…

Page 4

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Ocr Biology ­ B4, B5, B6

Exercise High Yes High
Hot day High Yes High

Urine tests can be used to diagnose diabetes and kidney disease
People with kidney failure sometimes need to be put on dialysis which works just like
the kidneys.
The fluid used in dialysis is made…

Page 5

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Ocr Biology ­ B4, B5, B6

o Chromosomes line up and spindle fibres form

o Spindle fibres pull the chromosomes apart

o The cell splits into two new cells. They are identical to the parent cell


Meiosis is a special type of cell division
It produces gametes (egg and…

Page 6

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Ocr Biology ­ B4, B5, B6

o Chromosomes split. This creates two daughter cells

o Chromosomes line up. Spindle fibres form

o The cell splits. 4 gametes are formed.

DNA Structure

DNA is found in chromosomes in the nucleus of cells.
DNA was only recently discovered. Here's a brief timeline…

Page 7

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Ocr Biology ­ B4, B5, B6

C always pairs with G

Chromosomes are made up of long strands of DNA
DNA is instructions for making proteins. The order of the bases affects how they are
3 Bases code for one amino acid. Amino acids join together to make proteins.…

Page 8

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Ocr Biology ­ B4, B5, B6

They are also found in adult bone marrow but they are harder to get and can't be
used for as many things
Some genes are active in every cell, for example the gene for making proteins to
transport chemicals
Some genes are only activated…

Page 9

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Ocr Biology ­ B4, B5, B6

Bright light being shone Cells at the back of the eyes Pupil becomes smaller
Knee being tapped The knee Knee jerk
Babies feet touching a flat
Feet Walking action
Putting your finger on a
Palm of the hand Grasping onto finger
babies palm…

Page 10

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Ocr Biology ­ B4, B5, B6

o The bell was a secondary stimulus- it had no direct link to the response

Complex behaviours

Mammals can develop complex behaviours
As they interact with the environment new neuron pathways are formed
As they learn these pathways become more likely to transmit impulses…


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