Eukaryotic cell mRNA transcripts can remain in the cell for hours because they are
A. isolated.
B. analogous.
C. long.
D. stable.
Answer: D
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The specimen of choice to collect in suspected cases of Francisella tularensis is:
a. blood. b. cerebrospinal fluid (CSF). c. lymph nodes. d. urine.
Tetanus is caused by a toxin produced by
1. Clostridium botulinum 2. Clostridium tetani 3. Clostridium perfringens 4. Clostridium welchii 5. Clostridium dificil
The goal of xenotransplantation research is to produce transgenic animals that could ________
a. produce more food b. become human organ donors c. all of the choices d. produce vaccines
The energy source that may have driven the chemical reactions leading to modern Earth's atmosphere was ____
a. sunlight b. electrical storms (lightning) c. photosynthesis d. radioactive decay e. heat energy released from Earth's core