Transformation has been observed in only a limited number of species in nature, but we have found ways to force the process upon other species in the laboratory.
Answer the following statement true (T) or false (F)
True
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Diazotrophs are found in all three domains of life
Indicate whether the statement is true or false.
Why is external water not essential for fertilization in seed plants?
A. The sperm cells in seed plants are capable of resisting desiccation. B. Seed plants use pollen instead of sperm for fertilization. C. Pollen grains are transported by wind or an animal. D. Sperm cells are used to transport pollen to the archegonia. E. Ovules are contained within the pollen.
The Hubbard Brook Watershed project measured all of the following EXCEPT
a. amount of energy used by consumers. b. amount of nutrients washed away by streams. c. nutrient input. d. precipitation. e. uptake of nutrients by plants.
The genetic testing procedure in which fluid surrounding the fetus is removed is ____
a. amniocentesis b. chorionic villus sample c. endoscopy d. preimplantation diagnosis e. sonography