The presence of a loop of Henle in nephrons is an evolutionary adaptation that enables mammals and birds to reabsorb water efficiently and produce a ________ urine.
A. hypertonic
B. hypotonic
C. isotonic
D. osmolar
Answer: A
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B cells and dendritic cells can both ____
a. act as APCs b. produce antibodies c. differentiate into memory cells d. carry out a cell-mediated immune response e. activate helper T cells
The steps involved in a single PCR cycle, in the correct order, are
A. heat to denature DNA strands and for primer to anneal, cool to allow DNA polymerase to copy DNA. B. heat to denature DNA strands, cool to allow primer to anneal, heat slightly to allow DNA polymerase to copy DNA. C. cool to denature DNA strands, heat to allow primer to anneal, cool to allow DNA polymerase to copy DNA. D. cool to allow DNA strands to anneal, heat to allow primer to anneal, cool to allow DNA polymerase to copy DNA. E. cool to allow primer to anneal, heat to denature DNA strands, cool to allow DNA polymerase to copy DNA.
Cloning an embryo to derive stem cells for the treatment of disease is known as ________
A) gene cloning B) genomics C) regenerative medicine D) reproductive cloning E) therapeutic cloning
The iron-sulfur world hypothesis suggests that organic molecules formed near:a
volcanoes. b. sulfur pools. c. pools of water. d. hydrothermal vents. e. low atmosphere clouds.