Which of the following statements are true
statements regarding the use of DNA in evolutionary
comparisons?
a. Lineages have a mixture of ancestral and novel
characters.
b. Mutations inevitably change those sequences
being studied over time.
c. 30% of yeast genes have counterparts in the
human genome.
d. Most mutations are neutral.
e. All of these are true.
Answer: e
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An infectious agent already existing on or in the body is called ________.
A. exogenous B. axenic C. endogenous D. an exotoxin E. an enterotoxin
Arbuscular mycorrhizae are characterized by all of the following features except
A. The fungus can associate with several species of plants. B. They are seen in the earliest vascular plant fossils. C. The fungal component is a glomeromycete. D. Fungal hyphae penetrate plant root cells. E. They are the most common mycorrhizal type.
Water molecules are polar, with
a) the oxygen side being slightly positive and the hydrogen side being slightly negative. b) the oxygen and hydrogen sides being slightly positive. c) the oxygen and hydrogen sides being slightly negative. d) the oxygen side being slightly negative and the hydrogen side being slightly positive.
Allergies are hypersensitivities to substances that ordinarily would do no harm to the body.
Answer the following statement true (T) or false (F)