Which curves on the graphs may represent the temperature and pH profiles of an enzyme taken from a bacterium that lives in a mildly alkaline hot springs at temperatures of 70 °C or higher?
A) curves 1 and 5
B) curves 2 and 4
C) curves 2 and 5
D) curves 3 and 4
E) curves 3 and 5
Answer: E
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Bird guides once listed the myrtle warbler and Audubon's warbler as distinct species. Recently, these birds have been classified as eastern and western forms of a single species, the yellow-rumped warbler
Which of the following pieces of evidence, if true, would be cause for this reclassification? A) The two forms interbreed often in nature, and their offspring have good survival and reproduction. B) The two forms live in similar habitats. C) The two forms have many genes in common. D) The two forms have similar food requirements. E) The two forms are very similar in coloration.
When you encounter a bear while hiking, which part of your nervous system triggers an increase in your heart rate and
breathing to help you run away?
a. the central nervous system b. the sympathetic nervous system c. the parasympathetic nervous system d. somatic nervous system e. cranial nerves
Which of the following respiratory surfaces lack physical protection from the external environment?
a. internal gills b. lungs c. tracheal system tubes d. external gills
Each spore grows by mitosis into a haploid organism by called a ________
Fill in the blank(s) with the appropriate word(s).