The femur in a snake and pelvis in a whale are examples of
A. homologous structures.
B. analogous structures.
C. homeotic structures.
D. vestigial structures.
E. heterologous structures.
Answer: D. vestigial structures.
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Type II restriction endonucleases
A) are heterodimers. B) natively function to methylate specific nucleotides and prevent foreign DNA from being incorporated into the genome. C) recognize nucleotide sequences that are palindromic. D) require ATP energy to cleave dsDNA.
The genotype is fixed at the moment of ____________________ and, barring mutation, is unchanging
Fill in the blank(s) with correct word
A constriction of an arteriole in response to stretch of the arteriole smooth muscle is called
A) active hyperemia. B) hypoxia. C) myogenic response. D) reactive hyperemia. E) ischemia.
In a signal transduction pathway involving cAMP as a second messenger, after a G protein is activated, the activated
G protein then activates:a. phospholipase C. b. adenylyl cyclase. c. calmodulin. d. protein kinase. e. diacylglycerol.