B2 test
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (11 张)
What are chromosomes found in
Pairs
What happens during the cell cycle
The genetic material is doubled and then divides into 2 identical nuclei in a process called mitosis.
What does a cell have to do before it divides
It has to replicate the DNA to form 2 copies of each chromosome
Where does mitosis take place in plant cells
The meristems, found in the shoot ad root tips
What is special about plant cell differentiation
They can differentiate multiple times
When do most types of animal cells differentiate
At the early stages of developement
What are the 2 types of animal stem cells
Embryonic stem cells and adult stem cells
Where are embryonic stem cells found
In human embryos
Where are adult stem cells found
In adult bone marrow
What are stem cells useful for
Treating conditions and medical reasearch
What are some problems with stem cells
The use of stem cells has some potential risks and some people have ethical or religious objections.