Most protein synthesis happens on the surface of the ___________
A. rough endoplasmic reticulum D. mitochondrion
B. smooth endoplasmic reticulum E. nucleus
C. Golgi complex
A
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placement of the phylum Platyhelminthes in the phylogenetic tree differs between a morphologically based phylogeny and a molecular based phylogeny. Which of the following statements best describes the interpretation based on molecular phylogeny?
A. Modern Platyhelminthes do not have a coelom but did originate from an ancestor that had one. B. The Platyhelminthes clade separated from other clades before coeloms evolved and consequently Platyhelminthes have never had a coelom. C. Platyhelminthes originated from ancestors with a coelom and have retained it to the present time. D. Platyhelminthes evolved from an ancestor without a coelom but developed one during the course of their evolution. E. Some Platyhelminthes have a coelom but others do not and it is difficult to conclude anything about its evolution within the clade.
The animal(s) often associated with Salmonella strains is/are
A. turtles. B. iguanas. C. baby chickens. D. ducks. E. All of the choices are correct.
The equalization of pressures between the ear and throat is made possible by the
a. pharynx. b. Eustachian tube. c. cupula. d. semicircular canals. e. round window.
The first multicellular organisms (algae) appeared about __________ billion years ago.
A. 1 B. 1.8 C. 3.5 D. 13