A species of archaea, Ferroplasma acidarmanus, lives in water and has a pH of zero, yet are able to maintain their internal pH at a cozy 5 despite living in an environment with a composition essentially the same as hot battery acid. These data showing the pH profiles of four enzymes isolated from F. acidarmanus indicate that optimal enzyme function occurs at
1.around pH 5, which is consistent with the organism’s internal environment.
2.around 0, which is consistent with the external environment.
3.an average of around pH 2.5.
4.a fairly basic pH.
3
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A. initiates stress response B. raises blood glucose level C. lowers blood glucose level D. stimulates bone growth E. inhibits loss of calcium from bone
The photoreceptor for photoperiodism and some other light-initiated plant responses is a group of blue-green pigmentsnamed:a
xanthophyll. b. carotene. c. chlorophyll. d. phytochrome. e. phycocyanin.
Arthropods were able to move onto land because their ________ prevented dehydration and provided support
Fill in the blank(s) with correct word
Which way does the adductor longus move the thigh?
A. in a cone B. toward the midline C. away from the midline D. towards the back E. in a circle