What is the process through which many animals develop irreversible species-specific behavior patterns?
A. altruism
B. taxis
C. operant conditioning
D. cognitive learning
E. imprinting
E. imprinting
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Many crustaceans (for example, lobsters, shrimp, and crayfish) use their tails to swim, but crabs have reduced tails that curl under their shells and are not used in swimming. This is an example of _____
A) convergent evolution B) a homologous structure C) natural selection D) a vestigial trait
In multicellular organisms, specialization in
structure and function of cells is caused by
a. inhibition of transcription. b. methylation of nucleotides. c. a differential expression of genes. d. translation without transcription. e. more than one of these.
The sequence of amino acids specified by this mRNA (AUGCGUCCA) is
a. serine - histidine - lysine. b. methionine - arginine - proline. c. methionine - alanine - serine. d. valine - arginine - leucine. e. valine - proline - methionine.
Four of the following statements about lizards are true. Which statement is false?
a. Lizards are a very small component of the present-day reptiles. b. Lizards gave rise to the snakes. c. Some lizards are not predators. d. Lizards have overlapping scales on their bodies. e. All lizards have three-chambered hearts.