Which of the following will yield nonexperimental data?
A. Investment performance over the last ten years of several portfolio managers
B. A clinical trial for determining the efficacy of a new drug
C. Crop yields from plots subject to different types of fertilizers
D. None of the answers is correct.
Answer: A
You might also like to view...
Interpret the results to the following experiment
Transcriptional activity of chemotactic genes showed a high expression level during the following conditions: repelling away from compound 1, moving towards compound 2, and remaining sessile when presented compounds 3 and 4. A) Activity during movement in any direction led to high measurements observed, and the sessile population responded equally to both a chemoattractant and a chemorepellant but remained in the same location for their net movement. B) Gene expression by itself cannot distinguish between cells responding to both an attractant and repellent, so this ambiguity makes transcriptomics unfavorable but nonetheless indicates activity. C) The activity observed during a sessile existence suggests the molecular probe was targeting a chemotactic gene that is also involved in other non-chemotactic functions due to the activity observed. D) Transcriptomics as a whole cannot be used for chemotaxis genes because they are not regulated at the transcriptional level (i.e., they are constitutive), which is why activity is observed on all three conditions.
Which of the following statements about the organization of complex multicellular organisms is false?
A. Exterior cells are highly differentiated whereas interior cells are not differentiated. B. Only some cells are in direct contact with the environment. C. Interior cells cannot grow as fast as exterior cells without mechanisms to transfer nutrients between cells. D. Exterior cells receive environmental signals directly, whereas interior cells receive environmental signals indirectly. E. Signals transferred from exterior cells to interior cells can activate or repress gene expression in the interior cells.
The blastopore develops into the ________ in protostomes and the _______ in deuterostomes.
a. mouth, anus b. mouth, urethra c. anus, mouth d. anus, nose
Autoimmunity is:
a. an automatic response to an antigen. b. a failure of self cell recognition. c. a reaction to environmental antigens. d. a normal response to infection. e. a response between the autonomic nervous system and the immune system