Expressed sequence tags, or ESTs,
A) are genetic markers generated from cDNA.
B) pertain to expressed genes only.
C) are oligonucleotides derived from mRNA.
D) A and C only
E) All of these
E
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In Caenorhabditis elegans vulval development, the fate of the progenitor cells is dependent on their proximity to the ____ cell, which secretes epidermal growth factor
Fill in the blank with the appropriate word.
Erythropoietin, a hormone that stimulates stem cells in bone marrow to increase erythrocyte
production, is produced in the
a. bone marrow. b. heart. c. kidneys. d. liver. e. lymph nodes.
Crossing over is __________.
A. the formation of tetrads B. the exchange of corresponding portions of homologous chromosomes C. the movement of genetic material from one chromosome to a nonhomologous chromosome D. an independent assortment of chromosomes
The heath hen, found off the east coast of North America in the eighteenth century, is now extinct. What finally caused its extinction?
A) overexploitation B) pollution C) natural disasters D) habitat loss