Microorganisms with the smallest genomes identified are generally
a. autotrophic.
b. bacillus-shaped.
c. marine.
d. parasitic.
Answer: D
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Zebrafish embryos change the color of the melanophore cells in their skin to a darker shade:
A. by dynein motor proteins moving pigment granules outward from the center of the cell. B. by kinesin motor proteins moving pigment granules outward from the center of the cell. C. by dynein motor proteins moving pigment granules inward toward the center of the cell. D. by kinesin motor proteins moving pigment granules inward toward the center of the cell. E. by dynein motor proteins moving pigment granules inward toward the plus end of microtubules.
A protein that is normally localized in the cytoplasm has been engineered so that it will be secreted from the cell instead. Which of the following represents the most likely pathway for the protein after it has been completely synthesized?
A) rER ? Golgi ? secretory vesicle ? environment B) rER ? Golgi ? sER ? cytoplasm ? environment C) cytoplasm ? rER ? Golgi ? secretory vesicle ? environment D) sER ? Golgi ? secretory vesicle ? environment E) rER ? secretory vesicle ? Golgi ? environment
A molecule of RNA (ribonucleic acid) contains the bases _______.
a. adenine, guanine, thymine, and uracil b. uracil, adenine, guanine, and adenosine c. thymine, adenine, guanine, and cytosine d. adenine, guanine, cytosine, and uracil
Which of the following was likely the host cell during primary endosymbiosis?
a. an archaeon b. an H2-producing bacterium c. an H2-using bacterium d. a photosynthetic bacterium