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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

Each spore grows by mitosis into a haploid organism by called a ________

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology