The mutant fly in Figure 17-2 illustrates all of the following except:
a. the existence of homeotic genes in Drosophila.
b. the concept of nuclear equivalence.
c. mutations in genes affecting segment identity.
d. an altered phenotype due to a mutant allele.
e. a structure containing many nuclei residing in a common cytoplasm
E
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Which ions are important in maintaining the
membrane potential of the neurons?
a. sodium and chloride b. potassium and calcium c. sodium and potassium d. magnesium and calcium e. none of these
Defining features of the halobacteria include ________.
A. the production of methane B. absolute dependence on a high concentration of NaCl for growth C. absolute dependence on temperatures above 65ºC for growth D. absolute dependence on low pH conditions for growth
Scientists have studied the effects of television watching on the metabolic rate of children and its potential implications for childhood obesity. In a study of 15 obese children and 16 non-obese children, it was found that the metabolic rate of all
children significantly decreased while watching television compared to their metabolic rate when they were at normal rest. The drop was greater for obese children, but the difference in drops between the two groups of children was not statistically significant. What is a reasonable conclusion to draw from this study? A) Television watching does not contribute at all to childhood obesity. B) Television watching likely contributes to adult obesity but not childhood obesity. C) Television watching contributes more to childhood obesity than the overconsumption of sugary foods. D) Television watching is an activity that should be carefully considered when studying factors that may affect childhood obesity.
Histamine and kinins cause increased blood flow and capillary permeability
Indicate whether the statement is true or false