A scientist cultures the dried soup from a 4,000-year-old cooking pot found in an Egyptian tomb and obtains a distinctive species of prokaryote. She immerses a test tube of these bacteria in boiling water for several hours, but the colony grows back
This species is probably
A) halophilic.
B) endospore-forming.
C) a spirochete.
D) a cyanobacteria.
Answer: B
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Why is green fluorescent protein (GFP) very useful in visualizing fusion proteins in eukaryotes?
A. The reaction is only dependent on the presence of GFP and ATP. B. It is easily cloned and expressed in bacterial cells. C. The presence of just a few molecules of GFP fusion proteins can be sufficient to create fluorescence. D. It is derived from fireflies, which are easy to cultivate in the lab. E. The GFP protein recognizes and binds to fusion proteins, allowing the location of the fusion protein to be determined.
Molecules produced by a cell that are not directly related to the synthesis of cell materials and that are usually produced after the growth phase has ended are called ________.
What will be an ideal response?
-laying mammals
a. hatch fully developed young from their eggs. b. are monotremes. c. are hairless. d. are confined to South America. e. bear their young into permanent pouches.
Blood returning from circulation through the body first enters the
A) left ventricle. B) right atrium. C) right ventricle. D) pulmonary vein. E) left atrium.