Lamarck argued that long-legged wading birdsare descended from short-legged ancestors that stretched their legs to
stay dry while feeding in shallow water, and consequently produced offspring with slightly longer legs. Which mechanism
did he use to support this argument?
a. principle of use and disuse
b. theory of catastrophism
c. inheritance of acquired characteristics
d. natural selection
e. evolution of vestigial structures
ANSWER: c
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A neuron may receive multiple stimuli from the same sensory neuron over a very short period of time. The firing rate of the receiving neuron is proportional to the number of signals received from the sensory neuron
Which of the following is this an example of? A. temporal summation B. spatial summation C. action potential D. hyperpolarization
Which of the following gives the most accurate measure of relative economic prosperity?
A) purchasing power parity B) GDP per capita C) GNP per capita D) national income
Answer the following statements true (T) or false (F)
1. Bacterial conjugation is also called bacterial sex because there is an equal exchange of genetic information between two cells. 2. Plasmids can help bacteria grow faster. 3. The transfer of genes from dead bacteria to live bacteria is called transformation. 4. It has been difficult to create an effective vaccine against HIV because reverse transcriptase cannot correct its errors.
Anabolic reactions may be characterized as
A. exergonic. B. breaking large molecules into smaller molecules. C. forming large molecules from smaller molecules. D. producing ATP. E. breaking large molecules into smaller molecules to produce ATP.