You label cells with a radioactive isotope of sulfur (35S).  The only molecules that would be radioactively labeled in these cells are:

A. Proteins
B. Lipids
C. Carbohydrates
D. Nucleic acids


Answer: A

Biology & Microbiology

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According to the endosymbiosis hypothesis

A. the first endosymbiotic event involved an anaerobic bacterium. B. the mitochondrion evolved from the same endosymbiont as the hydrogenosome. C. the first endosymbiont was a fermentative organism. D. All of the choices are correct.

Biology & Microbiology

Spontaneous mutation occurs when

A) a DNA base is in an unstable tautomeric form as the replication fork arrives and a mismatched base is inserted. B) a person smokes cigarettes or is exposed to a teratogen for many years. C) the sugars and phosphates in the DNA double helix exchange places. D) thymine temporarily becomes uracil.

Biology & Microbiology

Centrosome ring-shaped complexes contain ________ and ________

A) ?-tubulin; ?-tubulin B) ?-tubulin; MCAK C) ? -tubulin; MAP2 D) ?-tubulin; GRiPs E) ?-tubulin; crescentin

Biology & Microbiology

In a recent surgery, when the cut area was sutured, bacteria entered the open tissue.  As a result, you now have an infection of deep tissue exhibiting redness, swelling, pain, fever, and a rash.  With your knowledge of microbiology, you predict that you have a developed an infection caused by ________.

A. Staphylococcus B. E. coli C. Neisseria D. human herpesvirus 3

Biology & Microbiology