Based on the criterion of segmentation, which

organism most closely resembles the earliest
ancestral arthropod?
a. dragonfly
b. millipede
c. tick
d. crab
e. scorpion


Answer: b

Biology & Microbiology

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A particular reaction has a negative delta G. However, this reaction takes many years to proceed in the absence of enzyme. Why is this the case?

A. This reaction does not obey the second law of thermodynamics B. This reaction does not proceed spontaneously C. The initial free energy of the reactants is much less than the final free energy of the products D. A certain amount of activation energy is required for the reaction to proceed

Biology & Microbiology

In frogs, the gray crescent appears

a. after the egg matures. b. after fertilization. c. during blastula formation. d. following gastrulation. e. as a result of tissue specialization.

Biology & Microbiology

The observation by scientists that flies preferentially mate with those of similar phenotypes illustrates

random mating. Indicate whether the statement is true or false.

Biology & Microbiology

Animals belong to the Kingdom Animalia.

a. true b. false

Biology & Microbiology