The main components of the extracellular matrix are ____

a. glycolipids
b. phospholipids
c. glycoproteins
d. cellulose
e. glucose


ANSWER: c

Biology & Microbiology

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The nodes on a phylogenetic tree represent:

A. common ancestors. B. descendant lineages. C. sister groups. D. present-day groups. E. homologies.

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Which of the following mechanisms are causal explanations for bird song?

A. Young males learned their song from their fathers. B. Songs are used by males to attract a mate. C. The ritualization of the vocalization became species specific. D. Air passing through a bird's specialized singing organ, the syrinx, vibrates the surrounding organs.

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Each of the following ligands binds to an intracellular receptor except

A) cortisol. B) retinoic acid. C) thyroid hormone. D) epinephrine. E) estrogen.

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A dichotomous key is used to:

a. locate an organism b. identify an organism c. divide a kingdom d. interbreed species

Biology & Microbiology