What types of antigens are most susceptible to the action of precipitins?
A. Antigens on bacterial surfaces
B. Host cellular antigens
C. Antigens on the surface of viral particles
D. Soluble antigens
Answer: D
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Which statement accurately describes the relationship between RNA interference, small interfering
RNA, and micro RNAs?
a. They all describe different methods of post-translational gene regulation. b. Micro RNAs can be broken down into two types: RNA interference molecules and small interfering RNAs. c. RNA interference occurs in two ways: by micro RNA or by small interfering RNAs. d. Small interfering RNAs bind to dicer protein, microRNAs do not; both are types of RNA interference. e. MicroRNAs are transcribed from viruses, small interfering RNAs are transcribed from nuclear DNA; both are types of RNA interference.
A(n) ________ tree simply represents phylogenetic relationships but does not indicate which organisms are more primitive relative to others. In contrast, a(n) ________ tree gives a node that serves as the common ancestor and shows the development of the species from this origin.
Fill in the blank(s) with the appropriate word(s).
The exchange of oxygen and carbon dioxide occurs in the human lungs in the ____.
A. bronchi B. alveoli C. bronchioles D. trachea E. glottis
Assume you inoculated 100 cells, with a generation time of 20 minutes, into 100 ml of nutrient broth. You then inoculated 100 cells of the same species into 200 ml of nutrient broth. After incubation for 4 hours, you can reasonably expect to have
A) more cells in the 100 ml. B) more cells in the 200 ml. C) the same number of cells in both. D) The answer cannot be determined based on the information provided.