What process refers to dramatic phenotypic changes that sometimes occur in evolution, such as the
appearance of feathered wings during the evolution of birds?
a. paedomorphosis
b. gradualism
c. macroevolution
d. allopolyploidy
e. microevolution
C
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A key is placed into a keyhole then turned and the door opens. Which of the following components of cell signaling would best correspond to turning the key?
A. the hormone B. the receptor C. conformational change in the receptor once bound to the hormone D. signal transduction E. the cell response
Commensalism is a type of ____
a. predation b. symbiosis c. active competition d. scramble competition e. competitive exclusion
Microorganisms and cellular debris are removed from lymph by the ________ and from blood by the ________
Fill in the blank(s) with correct word
Xeroderma pigmentosum (XP) is a rare autosomal recessive disorder. Patients with XP exhibit a cellular hypersensitivity to ultraviolet (UV) radiation, a high incidence of skin cancer and premature aging. Based on these clinical characteristics, what is the most likely cause for this disease?
A. lack of telomerase activity B. defects in DNA replication C. defects in DNA repair D. shortened telomeres