Over time, the same bones in different vertebrates were put to different uses. This falls under the category of
A. heterologous structures.
B. analogous structures.
C. homologous structures.
D. vestigial organs.
Answer: C
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Which one of the following contributes to the utility of the strains of Salmonella typhimurium used in the Ames reversion assay?
A. They are highly permeable to test substances. B. It is very straightforward to assay the conversion of their histidine auxotrophy mutations to histidine prototrophy. C. They are defective in DNA repair and, therefore, cannot readily repair damage done by the test substances. D. All of the choices are correct.
You are studying a type of cell that you don't know much about. You want to determine what organism the cell comes from. You decide to watch cell division in this plant using the appropriate cell biology tools
After some experimentation, you determine that cytokinesis in this cell is sensitive to myosin inhibitors. You are likely studying A. a plant cell. B. an animal cell. C. a bacterial cell. D. a cell type that has not been previously studied.
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.
The kidneys help to maintain blood pressure by monitoring the pH of the blood.
Answer the following statement true (T) or false (F)