In addition to knowing the chemical structures of the nucleotides, Watson and Crick used ________ of Franklin and Wilkins and the chemical equivalencies of Chargaff in order to propose their model of DNA structure.

TLS Online TPP Program

#Question id: 18001

#Unit 9. Diversity of Life Forms

Where in an angiosperm would you find a megasporangium? 

TLS Online TPP Program

#Question id: 18002

#Unit 9. Diversity of Life Forms

What is the greatest threat to plant diversity? 

TLS Online TPP Program

#Question id: 18003

#Unit 9. Diversity of Life Forms

In a typical angiosperm, what is the sequence of structures encountered by the tip of a growing pollen tube on its way to the egg? 

1. micropyle 2. style 

3. ovary 4. stigma 

TLS Online TPP Program

#Question id: 18004

#Unit 9. Diversity of Life Forms

Which of the following flower parts develops into a seed? 

TLS Online TPP Program

#Question id: 18005

#Unit 9. Diversity of Life Forms

Which structure is common to both gymnosperms and angiosperms? 

TLS Online TPP Program

#Question id: 18006

#Unit 11. Evolution and Behavior

During which geological period origin, first forests; lands plants well established?