Which statement is true of polytomy branches?
a. Organisms in each branch share a common ancestor.
b. Polytomy represent mass speciation from a single mutation event.
c. The longest branch is the ancestor of the other sister taxa.
d. Polytomy branching only occurs in single-celled organisms.
a. Organisms in each branch share a common ancestor.
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Indicate whether the statement is true or false.
Which of the following statements about Chlamydia is incorrect?
A. Reticulate bodies differentiate into elementary bodies. B. It is an obligate parasite that needs host cells for growth. C. It is gram-negative. D. Elementary bodies are the infectious form. E. Elementary bodies lack enzyme systems for making ATP.
Which of the following is a characteristic of a late successional plant species?
A) high photosynthetic rates B) high stomatal conductance C) high efficiency at low light D) high acclimation potential
Oxygen would interfere with organic molecules by
A. increasing the weight (mass) of the molecules. B. combining with the organic molecules and destroying them. C. stopping all chemical reactions. D. increasing the thickness of the atmosphere.