Science - Biology

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  • Created by: megan :D
  • Created on: 11-01-22 20:59
If the magnification of an eyepiece is x10 and the objective is x40, what is the magnification of the microscope?
magnification of microscope =
magnification of eyepiece x magnification
of objective


= 10 x 40=400
answer = x400
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what is the equation to find magnification of an image
magnification =
size of image
---------------------
real size of image
2 of 14
What are the stages of cell division?
Cell growth -->
Chromosomes replicate -->
Further growth -->
Mitosis -->
2 daughter cells formed -->
3 of 14
What are the stages of Mitosis?
the cells divides -->
DNA replicates 2 copies of chromosome -->
nuclear membrane breaks down, chromosomes line up -->
one set of chromosomes pulled to each end of the cell, nucleus divides -->
cytoplasm and cell membrane divide to make 2 daughter cells
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What is the part where cell division takes place in plants?
Meristems
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What is Theraputic Cloning?
This is using cloning technology for medical purposes, for example, using human egg cells to produce stem cells with the same genetic make up as the patient
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What are the steps of therapeutic cloning?
Human egg cell from donors nucleus removed and replaced with nucleus from the patient -->
cell stimulated to divide -->
cell develops into an embryo -->
after 4-5 days stem cells removed and ready for use
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What is Osmosis?
It is the diffusion of water molecules from a region of higher concentration, to one of lower, through a semi-permeable membrane
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What is one way that a Communicable disease can be transmitted?
Direct contact
Water
Air
Unhygienic food preparation
Vector ( an organism that can spread a disease )
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How do vaccinations work?
weakened/dead version of pathogen injected into body -->
white blood cell releases complementary antibodies to the antigen -->
attach and clump pathogens together -->
white blood cells engulf pathogens ( phagocytosis occurs )
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What is an antibody?
A chemical produced by white blood cells that respond to an antigen ( parts of the pathogen)
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What is the Photosynthesis symbol equation?
➅CO
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What are the steps of the Photosynthesis RP?
1. set up boiling tube of NaHCO
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What are the 3 main limiting factors of Photosynthesis?
- carbon dioxide concentration
- light intensity
- temperature
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Card 2

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what is the equation to find magnification of an image

Back

magnification =
size of image
---------------------
real size of image

Card 3

Front

What are the stages of cell division?

Back

Preview of the front of card 3

Card 4

Front

What are the stages of Mitosis?

Back

Preview of the front of card 4

Card 5

Front

What is the part where cell division takes place in plants?

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Comments

megan :D

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gcse revision ;) ;)

megan :D

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hello

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