Quetions Corrections Flashcards
Function of mitochondria
Site of aerobic respiration
Name two types of cells in potato plants that do not contain chloroplasts
Root hair cells
Xylem
Explain why potato pieces in a 0.4mol/dm3 salt solution decreased in mass
Water moved out of the cells
By osmosis
As solution in cells is less concentrated than outside
Why is a thin layer of onion epidermis used
To see the sub cellular organelles
Why is iodine solution added to an onion epidermis during observation
To stain and see the sub cellular organelles like the nucleus
Two ways onion cells would look different when seen using an electron microscope
1)Would look more magnified
Could see more sub cellular organelles
A chemical response of plants
Berries that are poisonous
Two physical responses of plants
Thick waxy layer on leaf surface
Bark on trees that falls off
Explain why a tree might die if the roots are damaged
Less absorption of water so lower rate of photosynthesis and less glucose produced for respiration so less cellulose produced so less amino acids to produce new proteins cells lose turgidity
Less absorption of minerals and ions so less nitrates to make proteins for growth
Fewer magnesium ions so less chlorophyll produced for photosynthesis
Damages phloem as less transport of sugars to root cells
Describe how mitosis produces two genetically identical cells
Genetic material is doubled
The replicated chromosomes move apart
The cytoplasm divides into two
The set of chromosomes in each new cell are identical
Suggest how the monoclonal antibody for HIV helps prevent a person infected with HIV from developing AIDS
Monoclonal antibody is complementary to HIV antigen
Monoclonal antibodies attach to HIV antigens
So HIV can’t bind to human cell
