The main components of the extracellular matrix are ____
a. glycolipids
b. phospholipids
c. glycoproteins
d. cellulose
e. glucose
ANSWER: c
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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.
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.
Each of the following ligands binds to an intracellular receptor except
A) cortisol. B) retinoic acid. C) thyroid hormone. D) epinephrine. E) estrogen.
A dichotomous key is used to:
a. locate an organism b. identify an organism c. divide a kingdom d. interbreed species