Polyploidy as a mechanism of speciation occurs most commonly in which of the following life forms?
a. polychaete worms
b. fungi
c. plants
d. salamanders
e. molluscs
Ans: c. plants
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Answer the following statements true (T) or false (F)
1. There could be as many as 100 trillion microorganisms that live on us and in us. 2. The most common organisms in the indigenous microflora of the mouth are various species of b-hemolytic streptococci. 3. Microbes cause thousands of different types of plant diseases. 4. Most relationships between humans and microbes are beneficial rather than harmful. 5. Beneficial microorganisms far outnumber harmful ones.
Lysogenized cells
A. are immune to any further infection by any virus. B. are immune to infection by the same virus. C. may have new properties. D. respond to infection with the SOS response. E. are immune to infection by the same virus AND may have new properties.
Which structure is found in every cell?
a. Chloroplast b. Cell wall c. Nucleus d. Plasma membrane e. Central vacuole
Typically, bacterial DNA contains less repetitive DNA than eukaryotic DNA
Indicate whether the statement is true or false