How do viruses make copies of themselves?
A. By digesting the host cell they infected
B. By targeting their host cell for cell death
C. By taking the nutrients of the host cell they infected
D. By using the cellular machinery of the host cell they infected
Answer: D
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Which of the following is a characteristic of microRNAs (miRNAs)?
A. MicroRNAs are short RNA molecules. B. MicroRNAs silence the expression of specific mRNAs. C. MicroRNAs are found in plants and animals. D. MicroRNAs are cut by an enzyme called dicer. E. All of the choices are correct.
The half-life of Carbon-14 is approximately 5,700 years. Using this information scientists have been able to determine the age of some artifacts left by humans. A scientist wants to know approximately how old a piece of wood was that she found on the floor in an old cave that had recently been discovered. She removed the wood (with permission) to her laboratory. Her wood sample contained 2 grams of Carbon-14. If the age of the wood was determined to be 22,800 years old, how much Carbon-14 originally existed in this piece of wood?
A. 8 grams B. 16 grams C. 4 grams D. 32 grams E. 12 grams
The body stores carbohydrate as ________________________ in your body.
A. protein B. glucose C. glycogen D. None of the above is correct.
Lichens are composed of a symbiosis of fungi and which of the following?
A. green algae B. cyanobacteria C. euglenoids D. cyanobacteria or green algae E. euglenoids or dinoflagellates