Which of the following statements describes eukaryotic cells?
A) They have a cell wall.
B) They contain membrane-bound organelles such as a nucleus.
C) They may divide using binary fission, mitosis, or meiosis.
D) They may contain a cell wall made of peptidoglycan.
E) They may contain 80S or 70S ribosomes in their cytoplasm.
Answer: B
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A metagenomic study from a never-before-seen type of gingival infection indicates the presence of large numbers of archaea. Which of the following would be a good practice to isolate this organism?
A. Incubate the isolation medium adjacent to a bright full-spectrum light. B. Incubate the isolation medium at about 90°C. C. Adjust the pH of the medium to below 5. D. Use an anaerobic medium and incubate in a sealed container.
Explain how ozone (O3) is both beneficial and harmful to life. What will be an ideal response?
Lysosomal proteins are marked by adding a phosphate to a _______ group.
a. glucose b. serine c. GDP d. mannose
Green and yellow wavelengths of light are useless to most plants.
a. true b. false