DNA sequence evidence suggests that plants, fungi, and animals arose from different lineages of unicellular protists. This suggests which of the following?
A. Protists arose before the other three kingdoms.
B. Early ancestors to plants, fungi, and animals could interbreed.
C. Multicellular organisms only arose once in evolutionary history.
D. The animal, plant, and fungal kingdoms contain some single-celled organisms.
E. All unicellular organisms are now extinct.
A. Protists arose before the other three kingdoms.
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The synthesis of ____ is triggered when cells bind systemin
a. gibberellin b. auxin c. jasmonate d. cytokinin e. brassinosteroids
Agglomeration effects
A) have limited the growth of the computer industry in Silicon Valley. B) typically slow down regional economic development. C) are a form of external economy. D) occur when businesses are located near each other, but are not interdependent with each other. E) include both A and B.
Cells can be described as having a cytoskeleton of internal structures that contribute to the shape, organization, and movement of the cell. All of the following are part of the cytoskeleton except
a. the nuclear envelope. b. microtubules. c. microfilaments. d. intermediate filaments. e. actin.
Which of these provides evidence of the common ancestry of all life?
A) near universality of the genetic code B) structure of the nucleus C) structure of cilia D) structure of chloroplasts