Abiotic components of an ecosystem include
A. only animal life.
B. both living and nonliving components.
C. living components only.
D. nonliving components only.
E. all components except animal life.
D. nonliving components only.
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What were the short-term responses of each population during the first 20 years following the removal of the mice? a. Deer mice remained absent from the community and there was no apparent impact on thesize of all other populations
b. deer mice began to re-establish in the community. c. Mesquite rose to a level that dominated the community, but there was no apparent impact onthe size of all other populations. d. None of the above.
Sulfa drugs like Bactrim, given for bacterial infections, inhibit bacteria by blocking folic acid synthesis. The precursor molecule of folic acid is para-amino benzoic acid (PABA). Interestingly, PABA has a structure very similar to a sulfa drug. If a sulfa drug is present, the bacterial enzyme will bind the sulfa drug because of structural similarity. This is an example of ________.
A. competitive inhibition B. noncompetitive inhibition C. catabolite repression D. enzyme repression E. enzyme induction
The above figure of goslings (baby geese)
following their mother demonstrates a. imprinting behavior. b. displaying instinctive behavior. c. feeding a social parasite. d. a learned behavior. e. all of these
A negative feedback system is designed to set off mechanisms that will:a
lower the abnormal value until it reaches its normal level. b. increase the abnormal value until it reaches normal levels. c. return the system to steady-state levels. d. speed up the body's response until it reaches its normal levels. e. slow down the metabolic rate until steady-state levels are reached.