Cell Division Flashcards
What is a gene?
A gene is a short section of DNA that codes for a protein
How many chromosomes does a human have in each body cell?
23 pairs
What is an ethical consideration about the use of embryonic stem cells?
embryos are being produced so that stem cells can be extracted for research
Why are meristematic cells grown in a sterile culture medium?
To avoid the growth of microorganisms
What are guard cells in plants specialised to do?
Open and close to let carbon dioxide into the leaf for photosynthesis
What happens in the stage that is before mitosis in the cell cycle?
A period of growth, during which time DNA is checked for errors
A scientist observes 100 cancer cells with a microscope. If 16 cells are undergoing mitosis, and the length of the cell cycle is 400 hours, what is the length of mitosis?
64 hours
Where do plant stem cells occur?
meristems
What can Embryonic stem cells differentiate into?
into different cell types
