Which of the following is true?
a. Evolution always progresses toward complexity.
b. Complexity once gained cannot be lost.
c. Modern bacteria and archaea are more complex than ancestral forms.
d. Complexity can be lost.
D
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What are structural colors produced by in fish?
a. Biochromes b. Iridophores c. Pigments d. Chromatophores
Speciation caused by a change in the course of a river is an example of ____ speciation
a. divergent b. parapatric c. allopatric d. convergent e. sympatric
Which of the following is a function of a signal peptide?
A. to bind RNA polymerase to DNA and initiate transcription B. to signal the initiation of transcription C. to terminate translation of the messenger RNA D. to translocate polypeptides across the ER membrane E. to direct an mRNA molecule into the cisternal space of the ER
Algae that are important sources of thickening agents like agar are known as
A) Rhodophyta. B) Phaeophyta. C) Chrysophyta. D) Rhizobium. E) Chlorophyta.