Biology Corrections Flashcards
A protoctista which has a similar structure to an animal cell
Amoeba
Why do plants wilt?
The water leaves the cells through osmosis and they become flaccid. Therefore the plant tissues have little support
Describe the structure of DNA
Two strands in a double helix, the strands are held together by the 4 bases adenine:thymine gaumine:cytosine
Describe how meiosis leads to genetic variation
Gametes are genetically different, the different gametes combine at random so the offspring had a random mixture of chromosomes
What is a balanced diet.
A diet that contains all the nutrients and fibre in the right proportions
What are runners?
Stems which grow rapidly along the ground away from the plant and then they take root producing a new plant
Hair colour in identical twins
Will both be the same because hair colour is controlled by genes and identical twins have all the same genes
What is meant by the term mutation?
A random change in the DNASE which can be inherited
Explain how the carbon is released from the dead organisms
The decomposers break down the dead organisms and return the carbon to the air through respiration
What gas does fertilising solid produce?
Nitrous Oxide
