The most important stimulus in the control of respiration is the concentration in the blood and other body fluids of
(a) oxygen (O2).
(b) carbon dioxide (CO2).
(c) hydrogen ions (H+).
(d) nitrogen (N2).
(b) carbon dioxide (CO2).
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Suppose the protein specified by bicoid was injected into Drosophila embryos, so that a high concentration was present everywhere in the embryo. What might be the result of such an experiment?
A) The embryos would grow larger than normal. B) The embryos would show no development of posterior regions. C) The embryos would show no development of anterior regions. D) The embryos would halt their development.
You may have noticed that the prepackaged deli meats you purchase in the refrigerated section of the grocery store seem to last longer than the same meats purchased freshly sliced from the deli counter. You are puzzled because the meats are identical and you expect the products at the deli to be fresher. What is the primary reason the prepackaged meats last longer?
A. The prepackaged meats are typically sprayed with bacteriophage to prevent the growth of Listeria monocytogenes, which typically causes spoilage. B. The prepackaged meats are not handled by the deli workers. C. The prepackaged meats are stored at a much colder temperature than the deli case. D. The prepackaged meats have modified atmosphere packaging that has excluded oxygen gas, which would promote the growth of spoilage organisms.
In autocrine signaling, _________.
a) the messenger molecules reach their target cells via passage through bloodstream b) the messenger molecules travel only short distances through the extracellular space to cells that are in close proximity to the cell that is generating the message c) the messenger molecules are usually limited in their ability to travel around the body because they are inherently unstable or they are degraded by enzymes or they bind to extracellular matrix d) the cell producing the messenger expresses receptors on its surface that can respond to that messenger
A testable explanation for an observation
A) Ecosystem
B) Informed consent agreement
C) Epidemiologic studies
D) Critical thinking
E) Homeostasis
F) Metabolism
G) Placebo
H) Theory
I) Hypothesis
J) Adaptive trait