The transformation frequency of very competent cells is about 10?6, or about 1 in 1,000,000 when an excess of DNA is used.
Answer the following statement true (T) or false (F)
False
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Which feature does not occur in all living organisms?
a. All occur in living organisms b. Make and use organic molecules c. Consist of one or more cells d. Use DNA as their hereditary material e. Run the process of metabolism
Which of the following is a symbiotic relationship that was probably present in the first terrestrial plants and is still important for the mineral nutrition of present-day angiosperms?
a. Mycorrhizae b. Lichens c. Insects pollinating flowers d. Carnivorous plants feeding on insects e. Epiphytes growing on a tree trunk
Baker's yeast is a single-celled ascomycete that is used in bread making. Why does yeast make bread dough rise?
A. Yeast cells suck in air when trapped in dough. B. Multiplication of yeast physically expands the dough. C. The fungal cells burst causes the dough to expand. D. Carbon dioxide is produced during fermentation.
Crystalized and studied the tobacco mosaic virus
What will be an ideal response?