#Question id: 756
#Unit 1. Molecules and their Interaction Relevant to Biology
The thermal denaturation of DNA may be reversed by cooling the solution. Rapid cooling allows:
#Question id: 5542
#Unit 5. Developmental Biology
One stage of cleavage is the morula stage which is:
#Question id: 9179
#Unit 9. Diversity of Life Forms
Which of the following types of organisms is likely to have the widest geographic distribution?
#Question id: 4935
#Unit 11. Evolution and Behavior
Which gas was least abundant in Earthʹs early atmosphere, prior to 2 billion years ago?
#Question id: 4965
#Unit 11. Evolution and Behavior
What is thought to be the correct sequence of these events, from earliest to most recent, in the evolution of life on Earth?
1. origin of mitochondria
2. origin of multicellular eukaryotes
3. origin of chloroplasts
4. origin of cyanobacteria
5. origin of fungal-plant symbioses