Which of the following statements provides evidence that organelles (e.g., mitochondria and chloroplasts) originated billions of years ago as a result of primitive eukaryotic cells engulfing free-living bacterial cells? (Choose all that apply)
A. Their DNA is usually circular.
B. They have an inordinate amount of
noncoding DNA.
C. They do not synthesize proteins.
D. Their DNA is packed as a nucleoid rather
than as a chromosome.
A,D
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Trichomoniasis vaginalis is a sexually transmitted disease that can also survive on moist surfaces and in urine for several hours. As a result, trichomoniasis
A) is difficult to treat. B) is not a good candidate for eradication. C) can be spread by contact with contaminated toilet seats, sauna benches, and towels. D) is more common in males.
Antitoxins
A. are always genetically engineered. B. confer passive immunity. C. contain select antigenic components of a pathogen rather than whole cells or viruses. D. contain modified bacterial exotoxin molecules. E. utilize DNA strands that will produce the antigen.
The base sequence of DNA determines the base sequence in the molecule called ____________ , which carries the genetic information from the nucleus to the cytoplasm.
What will be an ideal response?
Which of the following would be considered appropriate exercise for a seriously obese individual to help lose weight?
What will be an ideal response?