Which of the following organisms have an
exoskeleton?
a. annelids
b. arthropods
c. cnidarians
d. roundworms
e. flatworms
B
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Evolutionarily, the jaws of vertebrates developed from:
A. the circular mouth of lampreys B. the last pharyngeal arch of jawless fishes C. the third pharyngeal arch of jawless fishes D. the operculum E. the claspers
Collagens are associated with which of the following types of cellular junctions?
A) gap junctions B) tight junctions C) plasmodesmata D) adhesive junctions E) none of the above
Synonymous changes that arise within coding sequences of genes
A) generally have no effect on the phenotype. B) are usually detrimental to fitness. C) may be eliminated by natural selection. D) occur more frequently than nonsynonymous changes. E) B and C only
Indicate whether the following statements are true or false. If the statement is false, explain why it is false
A. Membrane components in the cell are made in the endoplasmic reticulum. B. The Golgi apparatus is made up of a series of membrane-enclosed compartments through which materials destined for secretion must pass. C. Lysosomes are small organelles where fatty acid synthesis occurs.