Growth And Development Flashcards
Where is the DNA in bacterial cells if it does not have a nucleus?
DNA is found in the cytoplasm as a single circular stand or chromosome
Where in a diagram of a typical growth curve are the two phases involving rapid growth?
One is just after birth and the other one is is adolescence
What is th best measure of growth?
Dry mass
What is the limitation of measuring growth by length?
It is easy to do but only measures growth in one direction
What is measuring wet mass hard/ easy for?
It is hard to do for some organisms eg. Trees, but is easy for animals however water content of organisms can vary with time
How is dry mass measured?
By killing the organism and draining the water, but it does measure the true growth of the whole organism
Why may different parts of an organism grow at different rates to other parts?
Because the different parts may be needed at different times during the life of the organism
Stem cells stay _______, meaning ____
Stem cells stay undifferentiated, meaning they can develop into different types of cells
Where are stem cells obtained from and what can they potentially be used for?
Stem cells can be obtained from embryos and could potentially be used to treat some medical conditions
What are the issues with stem cell research in animals?
Some people think that it is wrong because the embryos are destroyed
However, others think that it’s acceptable as it can treat life-threatening diseases
Where else can stem cells be found that just in the embryo
They can also be found in the adult
Why are stem cells obtained from embryos better
Because embryonic stem cells can form a greater range of cell types and are easier to find
What is one difference between plant and animal growth, animals tend to grow
Animals tend to grow to a certain size yet plants continue growing
Name one different between plant and animal growth , plant cell division
Plant cell division only happens in areas called meristems, found at the tips of roots and shoots
Name one difference between plant and animal growth, the main way
The main way that plants gain height is by cell enlarging rather than dividing
