Viroids cause a variety of plant diseases and are composed only of:
a. strands of RNA.
b. strands of DNA.
c. protein coats.
d. peptidoglycan.
e. a capsid.
a
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Sequential growth of microorganisms in which the growth of one organism produces environmental conditions suitable for the subsequent growth of another organism is called ________.
Fill in the blank(s) with the appropriate word(s).
A(n) morphogen is a chemical agent that affects the differentiation of cells and the development of form. Indicate whether the statement is true or false
Many homeowners often attempt to transplant bushes and small trees but with limited success. Which of the following is the most likely reason for this?
A. Most homeowners pull the bush out without clearing enough of the soil from around the root system. This causes the branching roots to be torn off. B. Most homeowners remove too many of the leaves, not allowing the plant to efficiently run photosynthesis. C. Most homeowners cut the bush off at the base and don't have any of the root system available. D. Most homeowners pull the bush out without clearing enough of the soil from around the root system. This causes the lateral roots and root hairs to be torn off.
Answer the following questions true (T) or false (F)
1. Bacteria store their DNA within a spherical nucleus. 2. When bacteria undergo binary fission, they produce identical daughter cells. 3. Most bacteria present in the human intestines are pathogenic.