When reduction in population size is severe, it is known as _______.
A. fixed
B. founder effect
C. adaptive radiation
D. bottleneck
E. gene flow
Answer: D
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A fruit, such as a strawberry, that develops from tissues of the receptacle as well as the ovary would be
considered a(n)
a. aggregate fruit. b. accessory fruit. c. multiple fruit. d. simple fruit. e. compound fruit.
Extracts of pathogenic bacteria can transform
harmless bacteria to harmful bacteria unless ____ enzymes are added to the extract. a. protein-digesting b. mRNA-digesting c. tRNA-digesting d. DNA-digesting e. any of these
Microbial infection damages hosts by
A) toxins, exoenzymes, induction of immune response. B) attachment, invasion, endotoxin production. C) erythrocytes, phagocytes, disintegration. D) toxigenicity, autoimmunity, overactivity of immune system.
Of the over 19,000 new species described for the first time in 2009, more than half were
A) marine organisms. B) plants. C) insects. D) vertebrates.