What is one way in which energy flow differs from chemical cycling?
A) Energy flow is unidirectional; chemical elements can be recycled.
B) Energy can enter but cannot leave an ecosystem; chemical elements can leave but cannot enter an ecosystem.
C) Energy flows from lower to higher trophic levels; chemicals cycle from higher to lower trophic levels.
D) Energy can both enter and leave an ecosystem; chemical elements always remain within a single ecosystem.
A
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In allosteric control, activity of the enzyme is regulated by an ________ binding to the ________
a. enzyme / allosteric site b. activator / active site c. activator or inhibitor / allosteric site d. inhibitor / active site
What type of response is most associated with the brain sensing a cold environment? a. Decrease in blood flow to the skin
b. Heart rate decreasing. c. Increased respiration. d. Sweat glands increase their output. e. Increase in blood flow to the skin.
If you consider a DNA molecule to resemble a twisted ladder, the rungs of the ladder are paired nitrogen bases
__________________ Indicate whether the statement is true or false.
The Stramenopila are a very large and diverse group that all possess ________ at some point in their life cycle.
A. an exoskeleton B. heterokont flagella C. chloroplasts D. a macronucleus