The brown color of smog comes from light reflecting off of which substance in the atmosphere?
a. carbon dioxide
b. sulfur compounds
c. organic molecules
d. mercury
e. nitric oxide
ANSWER: e
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Bacteria growing at lower temperatures have more saturated fatty acids in their membranes.
Answer the following statement true (T) or false (F)
When a neuron membrane potential becomes less negative, it is said to be ____
a. depolarized b. hyperpolarized c. repolarized d. damaged e. activated above the threshold potential
Arrow "B" points to a structure that
a. is one of the four exclusive features of chordates. b. extends anteriorly into the head region. c. provides support for muscle contraction. d. is replaced in most adult vertebrates by the vertebral column. e. includes all of these
Which of the following best illustrates ecological succession?
a. overgrazing causes a nutrient loss from soil b. grass grows on a sand dune, is replaced by shrubs, and then by trees c. introduced pheasants increase, and native quail populations disappear d. decomposition in soil releases nitrogen that plants can use e. a mouse eats seeds, and an owl eats the mouse